slurm.conf (5)

---

NAME

slurm.conf - Slurm configuration file

DESCRIPTION

slurm.conf is an ASCII file which describes general SLURM configuration information, the nodes to be managed, information about how those nodes are grouped into partitions, and various scheduling parameters associated with those partitions. This file should be consistent across all nodes in the cluster.

The file location can be modified at system build time using the DEFAULT_SLURM_CONF parameter or at execution time by setting the SLURM_CONF environment variable. The SLURM daemons also allow you to override both the built-in and environment-provided location using the "-f" option on the command line.

The contents of the file are case insensitive except for the names of nodes and partitions. Any text following a "#" in the configuration file is treated as a comment through the end of that line. Changes to the configuration file take effect upon restart of SLURM daemons, daemon receipt of the SIGHUP signal, or execution of the command "scontrol reconfigure" unless otherwise noted.

If a line begins with the word "Include" followed by whitespace and then a file name, that file will be included inline with the current configuration file.

Note on file permissions:

The slurm.conf file must be readable by all users of SLURM, since it is used by many of the SLURM commands. Other files that are defined in the slurm.conf file, such as log files and job accounting files, may need to be created/owned by the user "SlurmUser" to be successfully accessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMISSIONS for information about the various files and directories used by SLURM.

PARAMETERS

The overall configuration parameters available include:

AccountingStorageBackupHost

The name of the backup machine hosting the accounting storage database. If used with the accounting_storage/slurmdbd plugin, this is where the backup slurmdbd would be running. Only used for database type storage plugins, ignored otherwise.

AccountingStorageEnforce

This controls what level of association-based enforcement to impose on job submissions. Valid options are any combination of associations, limits, nojobs, nosteps, qos, safe, and wckeys, or all for all things.

If limits, qos, or wckeys are set, associations will automatically be set.

If wckeys is set, TrackWCKey will automatically be set.

If safe is set, limits and associations will automatically be set.

If nojobs is set nosteps will automatically be set.

By enforcing Associations no new job is allowed to run unless a corresponding association exists in the system. If limits are enforced users can be limited by association to whatever job size or run time limits are defined.

If nojobs is set Slurm will not account for any jobs or steps on the system, like wise if nosteps is set Slurm will not account for any steps ran limits will still be enforced.

If safe is enforced a job will only be launched against an association or qos that has a GrpCPUMins limit set if the job will be able to run to completion. Without this option set, jobs will be launched as long as their usage hasn't reached the cpu-minutes limit which can lead to jobs being launched but then killed when the limit is reached.

With qos and/or wckeys enforced jobs will not be scheduled unless a valid qos and/or workload characterization key is specified.

When AccountingStorageEnforce is changed, a restart of the slurmctld daemon is required (not just a "scontrol reconfig").

AccountingStorageHost

The name of the machine hosting the accounting storage database. Only used for database type storage plugins, ignored otherwise. Also see DefaultStorageHost.

AccountingStorageLoc

The fully qualified file name where accounting records are written when the AccountingStorageType is "accounting_storage/filetxt" or else the name of the database where accounting records are stored when the AccountingStorageType is a database. Also see DefaultStorageLoc.

AccountingStoragePass

The password used to gain access to the database to store the accounting data. Only used for database type storage plugins, ignored otherwise. In the case of SLURM DBD (Database Daemon) with MUNGE authentication this can be configured to use a MUNGE daemon specifically configured to provide authentication between clusters while the default MUNGE daemon provides authentication within a cluster. In that case, AccountingStoragePass should specify the named port to be used for communications with the alternate MUNGE daemon (e.g. "/var/run/munge/global.socket.2"). The default value is NULL. Also see DefaultStoragePass.

AccountingStoragePort

The listening port of the accounting storage database server. Only used for database type storage plugins, ignored otherwise. Also see DefaultStoragePort.

AccountingStorageType

The accounting storage mechanism type. Acceptable values at present include "accounting_storage/filetxt", "accounting_storage/mysql", "accounting_storage/none", "accounting_storage/pgsql", and "accounting_storage/slurmdbd". The "accounting_storage/filetxt" value indicates that accounting records will be written to the file specified by the AccountingStorageLoc parameter. The "accounting_storage/mysql" value indicates that accounting records will be written to a MySQL database specified by the AccountingStorageLoc parameter. The "accounting_storage/pgsql" value indicates that accounting records will be written to a PostgreSQL database specified by the AccountingStorageLoc parameter. The "accounting_storage/slurmdbd" value indicates that accounting records will be written to the SLURM DBD, which manages an underlying MySQL or PostgreSQL database. See "man slurmdbd" for more information. The default value is "accounting_storage/none" and indicates that account records are not maintained. Note: The filetxt plugin records only a limited subset of accounting information and will prevent some sacct options from proper operation. Note: The PostgreSQL plugin is not complete and should not be used if wanting to use associations. It will however work with basic accounting of jobs and job steps. If interested in completing, please email slurm-dev@schedmd.com. Also see DefaultStorageType.

AccountingStorageUser

The user account for accessing the accounting storage database. Only used for database type storage plugins, ignored otherwise. Also see DefaultStorageUser.

AccountingStoreJobComment

If set to "YES" then include the job's comment field in the job complete message sent to the Accounting Storage database. The default is "YES".

AcctGatherNodeFreq

The AcctGather plugins sampling interval for node accounting. For AcctGather plugin values of none, this parameter is ignored. For all other values this parameter is the number of seconds between node accounting samples. For the acct_gather_energy/rapl plugin, set a value less than 300 because the counters may overflow beyond this rate. The default value is zero. This value disables accounting sampling for nodes. Note: The accounting sampling interval for jobs is determined by the value of JobAcctGatherFrequency.

AcctGatherEnergyType

Identifies the plugin to be used for energy consumption accounting. The jobacct_gather plugin and slurmd daemon call this plugin to collect energy consumption data for jobs and nodes. The collection of energy consumption data takes place on node level, hence only in case of exclusive job allocation the energy consumption measurements will reflect the jobs real consumption. In case of node sharing between jobs the reported consumed energy per job (through sstat or sacct) will not reflect the real energy consumed by the jobs.

Configurable values at present are:

acct_gather_energy/none

No energy consumption data is collected.

acct_gather_energy/ipmi

Energy consumption data is collected from the Baseboard Management Controller (BMC) using the Intelligent Platform Management Interface (IPMI).

acct_gather_energy/rapl

Energy consumption data is collected from hardware sensors using the Running Average Power Limit (RAPL) mechanism. Note that enabling RAPL may require the execution of the command "sudo modprobe msr".

AcctGatherInfinibandType

Identifies the plugin to be used for infiniband network traffic accounting. The plugin is activated only when profiling on hdf5 files is activated and the user asks for network data collection for jobs through --profile=Network (or =All). The collection of network traffic data takes place on node level, hence only in case of exclusive job allocation the collected values will reflect the jobs real traffic. All network traffic data are logged on hdf5 files per job on each node. No storage on the Slurm database takes place.

Configurable values at present are:

acct_gather_infiniband/none

No infiniband network data are collected.

acct_gather_infiniband/ofed

Infiniband network traffic data are collected from the hardware monitoring counters of Infiniband devices through the OFED library.

AcctGatherFilesystemType

Identifies the plugin to be used for filesystem traffic accounting. The plugin is activated only when profiling on hdf5 files is activated and the user asks for filesystem data collection for jobs through --profile=Network (or =All). The collection of filesystem traffic data takes place on node level, hence only in case of exclusive job allocation the collected values will reflect the jobs real traffic. All filesystem traffic data are logged on hdf5 files per job on each node. No storage on the Slurm database takes place.

Configurable values at present are:

acct_gather_filesystem/none

No filesystem data are collected.

acct_gather_filesystem/lustre

Lustre filesystem traffic data are collected from the counters found in /proc/fs/lustre/.

AcctGatherProfileType

Identifies the plugin to be used for detailed job profiling. The jobacct_gather plugin and slurmd daemon call this plugin to collect detailed data such as I/O counts, memory usage, or energy consumption for jobs and nodes. There are interfaces in this plugin to collect data as step start and completion, task start and completion, and at the account gather frequency. The data collected at the node level is related to jobs only in case of exclusive job allocation.

Configurable values at present are:

acct_gather_profile/none

No profile data is collected.

acct_gather_profile/hdf5

This enables the HDF5 plugin. The directory where the profile files are stored and which values are collected are configured in the acct_gather.conf file.

AuthType

The authentication method for communications between SLURM components. Acceptable values at present include "auth/none", "auth/authd", and "auth/munge". The default value is "auth/munge". "auth/none" includes the UID in each communication, but it is not verified. This may be fine for testing purposes, but do not use "auth/none" if you desire any security. "auth/authd" indicates that Brett Chun's authd is to be used (see "http://www.theether.org/authd/" for more information. Note that authd is no longer actively supported). "auth/munge" indicates that LLNL's MUNGE is to be used (this is the best supported authentication mechanism for SLURM, see "http://munge.googlecode.com/" for more information). All SLURM daemons and commands must be terminated prior to changing the value of AuthType and later restarted (SLURM jobs can be preserved).

BackupAddr

The name that BackupController should be referred to in establishing a communications path. This name will be used as an argument to the gethostbyname() function for identification. For example, "elx0000" might be used to designate the Ethernet address for node "lx0000". By default the BackupAddr will be identical in value to BackupController.

BackupController

The name of the machine where SLURM control functions are to be executed in the event that ControlMachine fails. This node may also be used as a compute server if so desired. It will come into service as a controller only upon the failure of ControlMachine and will revert to a "standby" mode when the ControlMachine becomes available once again. This should be a node name without the full domain name. I.e., the hostname returned by the gethostname() function cut at the first dot (e.g. use "tux001" rather than "tux001.my.com"). While not essential, it is recommended that you specify a backup controller. See the RELOCATING CONTROLLERS section if you change this.

BatchStartTimeout

The maximum time (in seconds) that a batch job is permitted for launching before being considered missing and releasing the allocation. The default value is 10 (seconds). Larger values may be required if more time is required to execute the Prolog, load user environment variables (for Moab spawned jobs), or if the slurmd daemon gets paged from memory.

CacheGroups

If set to 1, the slurmd daemon will cache /etc/groups entries. This can improve performance for highly parallel jobs if NIS servers are used and unable to respond very quickly. The default value is 0 to disable caching group data.

CheckpointType

The system-initiated checkpoint method to be used for user jobs. The slurmctld daemon must be restarted for a change in CheckpointType to take effect. Supported values presently include:

checkpoint/aix

for IBM AIX systems only

checkpoint/blcr

Berkeley Lab Checkpoint Restart (BLCR). NOTE: If a file is found at sbin/scch (relative to the SLURM installation location), it will be executed upon completion of the checkpoint. This can be a script used for managing the checkpoint files. NOTE: SLURM's BLCR logic only supports batch jobs.

checkpoint/none

no checkpoint support (default)

checkpoint/ompi

OpenMPI (version 1.3 or higher)

checkpoint/poe

for use with IBM POE (Parallel Operating Environment) only

ClusterName

The name by which this SLURM managed cluster is known in the accounting database. This is needed distinguish accounting records when multiple clusters report to the same database. Because of limitations in some databases, any upper case letters in the name will be silently mapped to lower case. In order to avoid confusion, it is recommended that the name be lower case.

CompleteWait

The time, in seconds, given for a job to remain in COMPLETING state before any additional jobs are scheduled. If set to zero, pending jobs will be started as soon as possible. Since a COMPLETING job's resources are released for use by other jobs as soon as the Epilog completes on each individual node, this can result in very fragmented resource allocations. To provide jobs with the minimum response time, a value of zero is recommended (no waiting). To minimize fragmentation of resources, a value equal to KillWait plus two is recommended. In that case, setting KillWait to a small value may be beneficial. The default value of CompleteWait is zero seconds. The value may not exceed 65533.

ControlAddr

Name that ControlMachine should be referred to in establishing a communications path. This name will be used as an argument to the gethostbyname() function for identification. For example, "elx0000" might be used to designate the Ethernet address for node "lx0000". By default the ControlAddr will be identical in value to ControlMachine.

ControlMachine

The short hostname of the machine where SLURM control functions are executed (i.e. the name returned by the command "hostname -s", use "tux001" rather than "tux001.my.com"). This value must be specified. In order to support some high availability architectures, multiple hostnames may be listed with comma separators and one ControlAddr must be specified. The high availability system must insure that the slurmctld daemon is running on only one of these hosts at a time. See the RELOCATING CONTROLLERS section if you change this.

CryptoType

The cryptographic signature tool to be used in the creation of job step credentials. The slurmctld daemon must be restarted for a change in CryptoType to take effect. Acceptable values at present include "crypto/munge" and "crypto/openssl". The default value is "crypto/munge".

DebugFlags

Defines specific subsystems which should provide more detailed event logging. Multiple subsystems can be specified with comma separators. Valid subsystems available today (with more to come) include:

Backfill

Backfill scheduler details

BGBlockAlgo

BlueGene block selection details

BGBlockAlgoDeep

BlueGene block selection, more details

BGBlockPick

BlueGene block selection for jobs

BGBlockWires

BlueGene block wiring (switch state details)

CPU_Bind

CPU binding details for jobs and steps

Energy

AcctGatherEnergy debug info

ExtSensors

External Sensors debug info

FrontEnd

Front end node details

Gres

Generic resource details

Gang

Gang scheduling details

NO_CONF_HASH

Do not log when the slurm.conf files differs between SLURM daemons

Priority

Job prioritization

Reservation

Advanced reservations

SelectType

Resource selection plugin

Steps

Slurmctld resource allocation for job steps

Switch

Switch plugin

Triggers

Slurmctld triggers

Wiki

Sched/wiki and wiki2 communications

ThreadID

Prints the thread ID in the log file

DefMemPerCPU

Default real memory size available per allocated CPU in MegaBytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res). The default value is 0 (unlimited). Also see DefMemPerNode and MaxMemPerCPU. DefMemPerCPU and DefMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

DefMemPerNode

Default real memory size available per allocated node in MegaBytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are shared (Shared=yes or Shared=force). The default value is 0 (unlimited). Also see DefMemPerCPU and MaxMemPerNode. DefMemPerCPU and DefMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

DefaultStorageHost

The default name of the machine hosting the accounting storage and job completion databases. Only used for database type storage plugins and when the AccountingStorageHost and JobCompHost have not been defined.

DefaultStorageLoc

The fully qualified file name where accounting records and/or job completion records are written when the DefaultStorageType is "filetxt" or the name of the database where accounting records and/or job completion records are stored when the DefaultStorageType is a database. Also see AccountingStorageLoc and JobCompLoc.

DefaultStoragePass

The password used to gain access to the database to store the accounting and job completion data. Only used for database type storage plugins, ignored otherwise. Also see AccountingStoragePass and JobCompPass.

DefaultStoragePort

The listening port of the accounting storage and/or job completion database server. Only used for database type storage plugins, ignored otherwise. Also see AccountingStoragePort and JobCompPort.

DefaultStorageType

The accounting and job completion storage mechanism type. Acceptable values at present include "filetxt", "mysql", "none", "pgsql", and "slurmdbd". The value "filetxt" indicates that records will be written to a file. The value "mysql" indicates that accounting records will be written to a mysql database. The default value is "none", which means that records are not maintained. The value "pgsql" indicates that records will be written to a PostgreSQL database. The value "slurmdbd" indicates that records will be written to the SLURM DBD, which maintains its own database. See "man slurmdbd" for more information. Also see AccountingStorageType and JobCompType.

DefaultStorageUser

The user account for accessing the accounting storage and/or job completion database. Only used for database type storage plugins, ignored otherwise. Also see AccountingStorageUser and JobCompUser.

DisableRootJobs

If set to "YES" then user root will be prevented from running any jobs. The default value is "NO", meaning user root will be able to execute jobs. DisableRootJobs may also be set by partition.

DynallocPort

Socket port used for MapReduce dynamic allocation communications. Used only by the slurmctld/dynalloc plugin.

EnforcePartLimits

If set to "YES" then jobs which exceed a partition's size and/or time limits will be rejected at submission time. If set to "NO" then the job will be accepted and remain queued until the partition limits are altered. The default value is "NO". NOTE: If set, then a job's QOS can not be used to exceed partition limits.

Epilog

Fully qualified pathname of a script to execute as user root on every node when a user's job completes (e.g. "/usr/local/slurm/epilog"). A glob pattern (See glob(7)) may also be used to run more than one epilog script (e.g. "/etc/slurm/epilog.d/*"). The Epilog script or scripts may be used to purge files, disable user login, etc. By default there is no epilog. See Prolog and Epilog Scripts for more information.

EpilogMsgTime

The number of microseconds that the slurmctld daemon requires to process an epilog completion message from the slurmd dameons. This parameter can be used to prevent a burst of epilog completion messages from being sent at the same time which should help prevent lost messages and improve throughput for large jobs. The default value is 2000 microseconds. For a 1000 node job, this spreads the epilog completion messages out over two seconds.

EpilogSlurmctld

Fully qualified pathname of a program for the slurmctld to execute upon termination of a job allocation (e.g. "/usr/local/slurm/epilog_controller"). The program executes as SlurmUser, which gives it permission to drain nodes and requeue the job if a failure occurs or cancel the job if appropriate. Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, it's allocated nodes, etc. are passed to the program using environment variables. See Prolog and Epilog Scripts for more information.

ExtSensorsFreq

The external sensors plugin sampling interval. If ExtSensorsType=ext_sensors/none, this parameter is ignored. For all other values of ExtSensorsType, this parameter is the number of seconds between external sensors samples for hardware components (nodes, switches, etc.) The default value is zero. This value disables external sensors sampling. Note: This parameter does not affect external sensors data collection for jobs/steps.

ExtSensorsType

Identifies the plugin to be used for external sensors data collection. Slurmctld calls this plugin to collect external sensors data for jobs/steps and hardware components. In case of node sharing between jobs the reported values per job/step (through sstat or sacct) may not be accurate. See also "man ext_sensors.conf".

Configurable values at present are:

ext_sensors/none

No external sensors data is collected.

ext_sensors/rrd

External sensors data is collected from the RRD database.

FastSchedule

Controls how a node's configuration specifications in slurm.conf are used. If the number of node configuration entries in the configuration file is significantly lower than the number of nodes, setting FastSchedule to 1 will permit much faster scheduling decisions to be made. (The scheduler can just check the values in a few configuration records instead of possibly thousands of node records.) Note that on systems with hyper-threading, the processor count reported by the node will be twice the actual processor count. Consider which value you want to be used for scheduling purposes.

1 (default)

Consider the configuration of each node to be that specified in the slurm.conf configuration file and any node with less than the configured resources will be set DOWN.

0

Base scheduling decisions upon the actual configuration of each individual node except that the node's processor count in SLURM's configuration must match the actual hardware configuration if SchedulerType=sched/gang or SelectType=select/cons_res are configured (both of those plugins maintain resource allocation information using bitmaps for the cores in the system and must remain static, while the node's memory and disk space can be established later).

2

Consider the configuration of each node to be that specified in the slurm.conf configuration file and any node with less than the configured resources will not be set DOWN. This can be useful for testing purposes.

FirstJobId

The job id to be used for the first submitted to SLURM without a specific requested value. Job id values generated will incremented by 1 for each subsequent job. This may be used to provide a meta-scheduler with a job id space which is disjoint from the interactive jobs. The default value is 1. Also see MaxJobId

GetEnvTimeout

Used for Moab scheduled jobs only. Controls how long job should wait in seconds for loading the user's environment before attempting to load it from a cache file. Applies when the srun or sbatch --get-user-env option is used. If set to 0 then always load the user's environment from the cache file. The default value is 2 seconds.

GresTypes

A comma delimited list of generic resources to be managed. These generic resources may have an associated plugin available to provide additional functionality. No generic resources are managed by default. Insure this parameter is consistent across all nodes in the cluster for proper operation. The slurmctld daemon must be restarted for changes to this parameter to become effective.

GroupUpdateForce

If set to a non-zero value, then information about which users are members of groups allowed to use a partition will be updated periodically, even when there have been no changes to the /etc/group file. Otherwise group member information will be updated periodically only after the /etc/group file is updated The default value is 0. Also see the GroupUpdateTime parameter.

GroupUpdateTime

Controls how frequently information about which users are members of groups allowed to use a partition will be updated. The time interval is given in seconds with a default value of 600 seconds and a maximum value of 4095 seconds. A value of zero will prevent periodic updating of group membership information. Also see the GroupUpdateForce parameter.

HealthCheckInterval

The interval in seconds between executions of HealthCheckProgram. The default value is zero, which disables execution.

HealthCheckNodeState

Identify what node states should execute the HealthCheckProgram. Multiple state values may be specified with a comma separator. The default value is ANY to execute on nodes in any state.

ALLOC

Run on nodes in the ALLOC state (all CPUs allocated).

ANY

Run on nodes in any state.

IDLE

Run on nodes in the IDLE state.

MIXED

Run on nodes in the MIXED state (some CPUs idle and other CPUs allocated).

HealthCheckProgram

Fully qualified pathname of a script to execute as user root periodically on all compute nodes that are not in the NOT_RESPONDING state. This program may be used to verify the node is fully operational and DRAIN the node or send email if a problem is detected. Any action to be taken must be explicitly performed by the program (e.g. execute "scontrol update NodeName=foo State=drain Reason=tmp_file_system_full" to drain a node). The execution interval is controlled using the HealthCheckInterval parameter. Note that the HealthCheckProgram will be executed at the same time on all nodes to minimize its impact upon parallel programs. This program is will be killed if it does not terminate normally within 60 seconds. By default, no program will be executed.

InactiveLimit

The interval, in seconds, after which a non-responsive job allocation command (e.g. srun or salloc) will result in the job being terminated. If the node on which the command is executed fails or the command abnormally terminates, this will terminate its job allocation. This option has no effect upon batch jobs. When setting a value, take into consideration that a debugger using srun to launch an application may leave the srun command in a stopped state for extended periods of time. This limit is ignored for jobs running in partitions with the RootOnly flag set (the scheduler running as root will be responsible for the job). The default value is unlimited (zero) and may not exceed 65533 seconds.

JobAcctGatherType

The job accounting mechanism type. Acceptable values at present include "jobacct_gather/aix" (for AIX operating system), "jobacct_gather/linux" (for Linux operating system), "jobacct_gather/cgroup" (experimental) and "jobacct_gather/none" (no accounting data collected). The default value is "jobacct_gather/none". "jobacct_gather/cgroup" is an experimental plugin for the Linux operating system that uses cgroups to collect accounting statistics. The plugin collects the following statistics: From the cgroup memory subsystem: memory.usage_in_bytes (reported as 'pages') and rss from memory.stat (reported as 'rss'). From the cgroup cpuacct subsystem: user cpu time and system cpu time. No value is provided by cgroups for virtual memory size ('vsize'). In order to use the sstat tool, "jobacct_gather/aix", "jobacct_gather/linux", or "jobacct_gather/cgroup" must be configured.
NOTE: Changing this configuration parameter changes the contents of the messages between Slurm daemons. Any previously running job steps are managed by a slurmstepd daemon that will persist through the lifetime of that job step and not change it's communication prototol. Only change this configuration parameter when there are no running job steps.

JobAcctGatherFrequency

The job accounting and profiling sampling intervals. The supported format is follows:

JobAcctGatherFrequency=<datatype>=<interval>

where <datatype>=<interval> specifies the task sampling interval for the jobacct_gather plugin or a sampling interval for a profiling type by the acct_gather_profile plugin. Multiple, comma-separated <datatype>=<interval> intervals may be specified. Supported datatypes are as follows:

task=<interval>

where <interval> is the task sampling interval in seconds for the jobacct_gather plugins and for task profiling by the acct_gather_profile plugin.

energy=<interval>

where <interval> is the sampling interval in seconds for energy profiling using the acct_gather_energy plugin

network=<interval>

where <interval> is the sampling interval in seconds for infiniband profiling using the acct_gather_infiniband plugin.

filesystem=<interval>

where <interval> is the sampling interval in seconds for filesystem profiling using the acct_gather_filesystem plugin.

The default value for task sampling interval is 30 seconds. The default value for all other intervals is 0. An interval of 0 disables sampling of the specified type. If the task sampling interval is 0, accounting information is collected only at job termination (reducing SLURM interference with the job).

Smaller (non-zero) values have a greater impact upon job performance, but a value of 30 seconds is not likely to be noticeable for applications having less than 10,000 tasks.

Users can independently override each interval on a per job basis using the --acctg-freq option when submitting the job.

JobCheckpointDir

Specifies the default directory for storing or reading job checkpoint information. The data stored here is only a few thousand bytes per job and includes information needed to resubmit the job request, not job's memory image. The directory must be readable and writable by SlurmUser, but not writable by regular users. The job memory images may be in a different location as specified by --checkpoint-dir option at job submit time or scontrol's ImageDir option.

JobCompHost

The name of the machine hosting the job completion database. Only used for database type storage plugins, ignored otherwise. Also see DefaultStorageHost.

JobCompLoc

The fully qualified file name where job completion records are written when the JobCompType is "jobcomp/filetxt" or the database where job completion records are stored when the JobCompType is a database. Also see DefaultStorageLoc.

JobCompPass

The password used to gain access to the database to store the job completion data. Only used for database type storage plugins, ignored otherwise. Also see DefaultStoragePass.

JobCompPort

The listening port of the job completion database server. Only used for database type storage plugins, ignored otherwise. Also see DefaultStoragePort.

JobCompType

The job completion logging mechanism type. Acceptable values at present include "jobcomp/none", "jobcomp/filetxt", "jobcomp/mysql", "jobcomp/pgsql", and "jobcomp/script"". The default value is "jobcomp/none", which means that upon job completion the record of the job is purged from the system. If using the accounting infrastructure this plugin may not be of interest since the information here is redundant. The value "jobcomp/filetxt" indicates that a record of the job should be written to a text file specified by the JobCompLoc parameter. The value "jobcomp/mysql" indicates that a record of the job should be written to a mysql database specified by the JobCompLoc parameter. The value "jobcomp/pgsql" indicates that a record of the job should be written to a PostgreSQL database specified by the JobCompLoc parameter. The value "jobcomp/script" indicates that a script specified by the JobCompLoc parameter is to be executed with environment variables indicating the job information.

JobCompUser

The user account for accessing the job completion database. Only used for database type storage plugins, ignored otherwise. Also see DefaultStorageUser.

JobCredentialPrivateKey

Fully qualified pathname of a file containing a private key used for authentication by SLURM daemons. This parameter is ignored if CryptoType=crypto/munge.

JobCredentialPublicCertificate

Fully qualified pathname of a file containing a public key used for authentication by SLURM daemons. This parameter is ignored if CryptoType=crypto/munge.

JobFileAppend

This option controls what to do if a job's output or error file exist when the job is started. If JobFileAppend is set to a value of 1, then append to the existing file. By default, any existing file is truncated.

JobRequeue

This option controls what to do by default after a node failure. If JobRequeue is set to a value of 1, then any batch job running on the failed node will be requeued for execution on different nodes. If JobRequeue is set to a value of 0, then any job running on the failed node will be terminated. Use the sbatch --no-requeue or --requeue option to change the default behavior for individual jobs. The default value is 1.

JobSubmitPlugins

A comma delimited list of job submission plugins to be used. The specified plugins will be executed in the order listed. These are intended to be site-specific plugins which can be used to set default job parameters and/or logging events. Sample plugins available in the distribution include "all_partitions", "cnode", "defaults", "logging", "lua", and "partition". For examples of use, see the SLURM code in "src/plugins/job_submit" and "contribs/lua/job_submit*.lua" then modify the code to satisfy your needs. SLURM can be configured to use multiple job_submit plugins if desired, however the lua plugin will only execute one lua script named "job_submit.lua" and located in default script directory (typically the subdirectory "etc" of the installation directory). No job submission plugins are used by default.

KeepAliveTime

Specifies how long sockets communications used between the srun command and its slurmstepd process are kept alive after disconnect. Longer values can be used to improve reliability of communications in the event of network failures. The default value leaves the system default value. The value may not exceed 65533.

KillOnBadExit

If set to 1, the job will be terminated immediately when one of the processes is crashed or aborted. With the default value of 0, if one of the processes is crashed or aborted the other processes will continue to run. The user can override this configuration parameter by using srun's -K, --kill-on-bad-exit.

KillWait

The interval, in seconds, given to a job's processes between the SIGTERM and SIGKILL signals upon reaching its time limit. If the job fails to terminate gracefully in the interval specified, it will be forcibly terminated. The default value is 30 seconds. The value may not exceed 65533.

LaunchType

Identifies the mechanism to be used to launch application tasks. Acceptable values include "launch/aprun" for use with Cray systems with ALPS, "launch/poe" for use with IBM Parallel Environment (PE), "launch/runjob" for use with IBM BlueGene/Q systems, and "launch/slurm" for all other systems. The default value is "launch/aprun" for Cray systems, "launch/poe" for systems with the IBM NRT library installed, "launch/runjob" for IBM BlueGene/Q systems, and "launch/slurm" for all other systems.

Licenses

Specification of licenses (or other resources available on all nodes of the cluster) which can be allocated to jobs. License names can optionally be followed by a colon and count with a default count of one. Multiple license names should be comma separated (e.g. "Licenses=foo:4,bar"). Note that SLURM prevents jobs from being scheduled if their required license specification is not available. SLURM does not prevent jobs from using licenses that are not explicitly listed in the job submission specification.

MailProg

Fully qualified pathname to the program used to send email per user request. The default value is "/usr/bin/mail".

MaxArraySize

The maximum job array size. The maximum job array task index value will be one less than MaxArraySize to allow for an index value of zero. Configure MaxArraySize to 0 in order to disable job array use. The value may not exceed 65533. Default value is 1001.

MaxJobCount

The maximum number of jobs SLURM can have in its active database at one time. Set the values of MaxJobCount and MinJobAge to insure the slurmctld daemon does not exhaust its memory or other resources. Once this limit is reached, requests to submit additional jobs will fail. The default value is 10000 jobs. Performance can suffer with more than a couple hundred thousand jobs. Setting per MaxSubmitJobs per user is generally valuable to prevent a single user from filling the system with jobs. This is accomplished using Slurm's database and configuring enforcement of resource limits. This value may not be reset via "scontrol reconfig". It only takes effect upon restart of the slurmctld daemon.

MaxJobId

The maximum job id to be used for jobs submitted to SLURM without a specific requested value. Job id values generated will incremented by 1 for each subsequent job. This may be used to provide a meta-scheduler with a job id space which is disjoint from the interactive jobs. Once MaxJobId is reached, the next job will be assigned FirstJobId. The default value is 4294901760 (0xffff0000). Also see FirstJobId.

MaxMemPerCPU

Maximum real memory size available per allocated CPU in MegaBytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res). The default value is 0 (unlimited). Also see DefMemPerCPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

MaxMemPerNode

Maximum real memory size available per allocated node in MegaBytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are shared (Shared=yes or Shared=force). The default value is 0 (unlimited). Also see DefMemPerNode and MaxMemPerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

MaxStepCount

The maximum number of steps that any job can initiate. This parameter is intended to limit the effect of bad batch scripts. The default value is 40000 steps.

MaxTasksPerNode

Maximum number of tasks SLURM will allow a job step to spawn on a single node. The default MaxTasksPerNode is 128. May not exceed 65533.

MessageTimeout

Time permitted for a round-trip communication to complete in seconds. Default value is 10 seconds. For systems with shared nodes, the slurmd daemon could be paged out and necessitate higher values.

MinJobAge

The minimum age of a completed job before its record is purged from SLURM's active database. Set the values of MaxJobCount and
  to insure the slurmctld daemon does not exhaust its memory or other resources. The default value is 300 seconds. A value of zero prevents any job record purging. In order to eliminate some possible race conditions, the minimum non-zero value for MinJobAge recommended is 2. May not exceed 65533.

MpiDefault

Identifies the default type of MPI to be used. Srun may override this configuration parameter in any case. Currently supported versions include: lam, mpich1_p4, mpich1_shmem, mpichgm, mpichmx, mvapich, none (default, which works for many other versions of MPI) and openmpi. pmi2, More information about MPI use is available here <http://slurm.schedmd.com/mpi_guide.html>.

MpiParams

MPI parameters. Used to identify ports used by OpenMPI only and the input format is "ports=12000-12999" to identify a range of communication ports to be used.

OverTimeLimit

Number of minutes by which a job can exceed its time limit before being canceled. The configured job time limit is treated as a soft limit. Adding OverTimeLimit to the soft limit provides a hard limit, at which point the job is canceled. This is particularly useful for backfill scheduling, which bases upon each job's soft time limit. The default value is zero. May not exceed exceed 65533 minutes. A value of "UNLIMITED" is also supported.

PluginDir

Identifies the places in which to look for SLURM plugins. This is a colon-separated list of directories, like the PATH environment variable. The default value is "/usr/local/lib/slurm".

PlugStackConfig

Location of the config file for SLURM stackable plugins that use the Stackable Plugin Architecture for Node job (K)control (SPANK). This provides support for a highly configurable set of plugins to be called before and/or after execution of each task spawned as part of a user's job step. Default location is "plugstack.conf" in the same directory as the system slurm.conf. For more information on SPANK plugins, see the spank(8) manual.

PreemptMode

Enables gang scheduling and/or controls the mechanism used to preempt jobs. When the PreemptType parameter is set to enable preemption, the PreemptMode selects the default mechanism used to preempt the lower priority jobs for the cluster. PreemptMode may be specified on a per partition basis to over ride this default value if PreemptType=preempt/partition_prio, but a valid default PreemptMode value must be specified for the cluster as a whole when preemption is enabled. The GANG option is used to enable gang scheduling independent of whether preemption is enabled (the PreemptType setting). The GANG option can be specified in addition to a PreemptMode setting with the two options comma separated. The SUSPEND option requires that gang scheduling be enabled (i.e, "PreemptMode=SUSPEND,GANG").

OFF

is the default value and disables job preemption and gang scheduling. This is the only option compatible with SchedulerType=sched/wiki or SchedulerType=sched/wiki2 (used by Maui and Moab respectively, which provide their own job preemption functionality).

CANCEL

always cancel the job.

CHECKPOINT

preempts jobs by checkpointing them (if possible) or canceling them.

GANG

enables gang scheduling (time slicing) of jobs in the same partition. NOTE: Gang scheduling is performed independently for each partition, so configuring partitions with overlapping nodes and gang scheduling is generally not recommended.

REQUEUE

preempts jobs by requeuing them (if possible) or canceling them.

SUSPEND

preempts jobs by suspending them. A suspended job will resume execution once the high priority job preempting it completes. The SUSPEND may only be used with the GANG option (the gang scheduler module performs the job resume operation) and with PreemptType=preempt/partition_prio (the logic to suspend and resume jobs current only has the data structures to support partitions).

PreemptType

This specifies the plugin used to identify which jobs can be preempted in order to start a pending job.

preempt/none

Job preemption is disabled. This is the default.

preempt/partition_prio

Job preemption is based upon partition priority. Jobs in higher priority partitions (queues) may preempt jobs from lower priority partitions. This is not compatible with PreemptMode=OFF.

preempt/qos

Job preemption rules are specified by Quality Of Service (QOS) specifications in the SLURM database a database. This is not compatible with PreemptMode=OFF or PreemptMode=SUSPEND (i.e. preempted jobs must be removed from the resources).

PriorityDecayHalfLife

This controls how long prior resource use is considered in determining how over- or under-serviced an association is (user, bank account and cluster) in determining job priority. If set to 0 no decay will be applied. This is helpful if you want to enforce hard time limits per association. If set to 0 PriorityUsageResetPeriod must be set to some interval. Applicable only if PriorityType=priority/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days).

PriorityCalcPeriod

The period of time in minutes in which the half-life decay will be re-calculated. Applicable only if PriorityType=priority/multifactor. The default value is 5 (minutes).

PriorityFavorSmall

Specifies that small jobs should be given preferential scheduling priority. Applicable only if PriorityType=priority/multifactor. Supported values are "YES" and "NO". The default value is "NO".

PriorityFlags

Flags to modify priority behavior Applicable only if PriorityType=priority/multifactor. The keywords below have no associated value (e.g. "PriorityFlags=ACCRUE_ALWAYS,SMALL_RELATIVE_TO_TIME").

ACCRUE_ALWAYS

If set, priority age factor will be increased despite job dependencies or holds.

SMALL_RELATIVE_TO_TIME

If set, the job's size component will be based upon not the job size alone, but the job's size divided by it's time limit.

TICKET_BASED

If set, priority will be calculated based on the ticket system.

PriorityMaxAge

Specifies the job age which will be given the maximum age factor in computing priority. For example, a value of 30 minutes would result in all jobs over 30 minutes old would get the same age-based priority. Applicable only if PriorityType=priority/multifactor. The unit is a time string (i.e. min, hr:min:00, days-hr:min:00, or days-hr). The default value is 7-0 (7 days).

PriorityUsageResetPeriod

At this interval the usage of associations will be reset to 0. This is used if you want to enforce hard limits of time usage per association. If PriorityDecayHalfLife is set to be 0 no decay will happen and this is the only way to reset the usage accumulated by running jobs. By default this is turned off and it is advised to use the PriorityDecayHalfLife option to avoid not having anything running on your cluster, but if your schema is set up to only allow certain amounts of time on your system this is the way to do it. Applicable only if PriorityType=priority/multifactor.

NONE

Never clear historic usage. The default value.

NOW

Clear the historic usage now. Executed at startup and reconfiguration time.

DAILY

Cleared every day at midnight.

WEEKLY

Cleared every week on Sunday at time 00:00.

MONTHLY

Cleared on the first day of each month at time 00:00.

QUARTERLY

Cleared on the first day of each quarter at time 00:00.

YEARLY

Cleared on the first day of each year at time 00:00.

PriorityType

This specifies the plugin to be used in establishing a job's scheduling priority. Supported values are "priority/basic" (jobs are prioritized by order of arrival, also suitable for sched/wiki and sched/wiki2), "priority/multifactor" (jobs are prioritized based upon size, age, fair-share of allocation, etc). Also see PriorityFlags for configuration options. The default value is "priority/basic".

PriorityWeightAge

An integer value that sets the degree to which the queue wait time component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

PriorityWeightFairshare

An integer value that sets the degree to which the fair-share component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

PriorityWeightJobSize

An integer value that sets the degree to which the job size component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

PriorityWeightPartition

An integer value that sets the degree to which the node partition component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

PriorityWeightQOS

An integer value that sets the degree to which the Quality Of Service component contributes to the job's priority. Applicable only if PriorityType=priority/multifactor. The default value is 0.

PrivateData

This controls what type of information is hidden from regular users. By default, all information is visible to all users. User SlurmUser and root can always view all information. Multiple values may be specified with a comma separator. Acceptable values include:

accounts

(NON-SLURMDBD ACCOUNTING ONLY) Prevents users from viewing any account definitions unless they are coordinators of them.

jobs

Prevents users from viewing jobs or job steps belonging to other users. (NON-SLURMDBD ACCOUNTING ONLY) Prevents users from viewing job records belonging to other users unless they are coordinators of the association running the job when using sacct.

nodes

Prevents users from viewing node state information.

partitions

Prevents users from viewing partition state information.

reservations

Prevents regular users from viewing reservations.

usage

Prevents users from viewing usage of any other user, this applies to sshare. (NON-SLURMDBD ACCOUNTING ONLY) Prevents users from viewing usage of any other user, this applies to sreport.

users

(NON-SLURMDBD ACCOUNTING ONLY) Prevents users from viewing information of any user other than themselves, this also makes it so users can only see associations they deal with. Coordinators can see associations of all users they are coordinator of, but can only see themselves when listing users.

ProctrackType

Identifies the plugin to be used for process tracking. The slurmd daemon uses this mechanism to identify all processes which are children of processes it spawns for a user job. The slurmd daemon must be restarted for a change in ProctrackType to take effect. NOTE: "proctrack/linuxproc" and "proctrack/pgid" can fail to identify all processes associated with a job since processes can become a child of the init process (when the parent process terminates) or change their process group. To reliably track all processes, one of the other mechanisms utilizing kernel modifications is preferable. NOTE: "proctrack/linuxproc" is not compatible with "switch/elan." Acceptable values at present include:

proctrack/aix

which uses an AIX kernel extension and is the default for AIX systems

proctrack/cgroup

which uses linux cgroups to constrain and track processes. NOTE: see "man cgroup.conf" for configuration details NOTE: This plugin writes to disk often and can impact performance. If you are running lots of short running jobs (less than a couple of seconds) this plugin slows down performance dramatically. It should probably be avoided in an HTC environment.

proctrack/linuxproc

which uses linux process tree using parent process IDs

proctrack/lua

which uses a site-specific LUA script to track processes

proctrack/sgi_job

which uses SGI's Process Aggregates (PAGG) kernel module, see http://oss.sgi.com/projects/pagg/ for more information

proctrack/pgid

which uses process group IDs and is the default for all other systems

Prolog

Fully qualified pathname of a program for the slurmd to execute whenever it is asked to run a job step from a new job allocation (e.g. "/usr/local/slurm/prolog"). A glob pattern (See glob(7)) may also be used to specify more than one program to run (e.g. "/etc/slurm/prolog.d/*"). The slurmd executes the prolog before starting the first job step. The prolog script or scripts may be used to purge files, enable user login, etc. By default there is no prolog. Any configured script is expected to complete execution quickly (in less time than MessageTimeout). If the prolog fails (returns a non-zero exit code), this will result in the node being set to a DOWN state and the job requeued to executed on another node. See Prolog and Epilog Scripts for more information.

PrologSlurmctld

Fully qualified pathname of a program for the slurmctld daemon to execute before granting a new job allocation (e.g. "/usr/local/slurm/prolog_controller"). The program executes as SlurmUser on the same node where the slurmctld daemon executes, giving it permission to drain nodes and requeue the job if a failure occurs or cancel the job if appropriate. The program can be used to reboot nodes or perform other work to prepare resources for use. Exactly what the program does and how it accomplishes this is completely at the discretion of the system administrator. Information about the job being initiated, it's allocated nodes, etc. are passed to the program using environment variables. While this program is running, the nodes associated with the job will be have a POWER_UP/CONFIGURING flag set in their state, which can be readily viewed. The slurmctld daemon will wait indefinitely for this program to complete. Once the program completes with an exit code of zero, the nodes will be considered ready for use and the program will be started. If some node can not be made available for use, the program should drain the node (typically using the scontrol command) and terminate with a non-zero exit code. A non-zero exit code will result in the job being requeued (where possible) or killed. Note that only batch jobs can be requeued. See Prolog and Epilog Scripts for more information.

PropagatePrioProcess

Controls the scheduling priority (nice value) of user spawned tasks.

0

The tasks will inherit the scheduling priority from the slurm daemon. This is the default value.

1

The tasks will inherit the scheduling priority of the command used to submit them (e.g. srun or sbatch). Unless the job is submitted by user root, the tasks will have a scheduling priority no higher than the slurm daemon spawning them.

2

The tasks will inherit the scheduling priority of the command used to submit them (e.g. srun or sbatch) with the restriction that their nice value will always be one higher than the slurm daemon (i.e. the tasks scheduling priority will be lower than the slurm daemon).

PropagateResourceLimits

A list of comma separated resource limit names. The slurmd daemon uses these names to obtain the associated (soft) limit values from the users process environment on the submit node. These limits are then propagated and applied to the jobs that will run on the compute nodes. This parameter can be useful when system limits vary among nodes. Any resource limits that do not appear in the list are not propagated. However, the user can override this by specifying which resource limits to propagate with the srun commands "--propagate" option. If neither of the 'propagate resource limit' parameters are specified, then the default action is to propagate all limits. Only one of the parameters, either PropagateResourceLimits or PropagateResourceLimitsExcept, may be specified. The following limit names are supported by SLURM (although some options may not be supported on some systems):

ALL

All limits listed below

NONE

No limits listed below

AS

The maximum address space for a process

CORE

The maximum size of core file

CPU

The maximum amount of CPU time

DATA

The maximum size of a process's data segment

FSIZE

The maximum size of files created. Note that if the user sets FSIZE to less than the current size of the slurmd.log, job launches will fail with a 'File size limit exceeded' error.

MEMLOCK

The maximum size that may be locked into memory

NOFILE

The maximum number of open files

NPROC

The maximum number of processes available

RSS

The maximum resident set size

STACK

The maximum stack size

PropagateResourceLimitsExcept

A list of comma separated resource limit names. By default, all resource limits will be propagated, (as described by the PropagateResourceLimits parameter), except for the limits appearing in this list. The user can override this by specifying which resource limits to propagate with the srun commands "--propagate" option. See PropagateResourceLimits above for a list of valid limit names.

RebootProgram

Program to be executed on each compute node to reboot it. Invoked on each node once it becomes idle after the command "scontrol reboot_nodes" is executed by an authorized user. After being rebooting, the node is returned to normal use.

ReconfigFlags

Flags to control various actions that may be taken when an "scontrol reconfig" command is issued. Currently the only option defined is:

KeepPartInfo

If set, an "scontrol reconfig" command will maintain the in-memory value of partition "state" and other parameters that may have been dynamically updated by "scontrol update". Partition information in the slurm.conf file will be merged with in-memory data. This flag supersedes the KeepPartState flag.

KeepPartState

If set, an "scontrol reconfig" command will preserve only the current "state" value of in-memory partitions and will reset all other parameters of the partitions that may have been dynamically updated by "scontrol update" to the values from the slurm.conf file. Partition information in the slurm.conf file will be merged with in-memory data.

The default for the above flags is not set, and the "scontrol reconfig" will rebuild the partition information using only the definitions in the slurm.conf file.

ResumeProgram

SLURM supports a mechanism to reduce power consumption on nodes that remain idle for an extended period of time. This is typically accomplished by reducing voltage and frequency or powering the node down. ResumeProgram is the program that will be executed when a node in power save mode is assigned work to perform. For reasons of reliability, ResumeProgram may execute more than once for a node when the slurmctld daemon crashes and is restarted. If ResumeProgram is unable to restore a node to service, it should requeue any node associated with the node and set the node state to DRAIN. The program executes as SlurmUser. The argument to the program will be the names of nodes to be removed from power savings mode (using SLURM's hostlist expression format). By default no program is run. Related configuration options include ResumeTimeout, ResumeRate, SuspendRate, SuspendTime, SuspendTimeout, SuspendProgram, SuspendExcNodes, and SuspendExcParts. More information is available at the SLURM web site ( http://slurm.schedmd.com/power_save.html ).

ResumeRate

The rate at which nodes in power save mode are returned to normal operation by ResumeProgram. The value is number of nodes per minute and it can be used to prevent power surges if a large number of nodes in power save mode are assigned work at the same time (e.g. a large job starts). A value of zero results in no limits being imposed. The default value is 300 nodes per minute. Related configuration options include ResumeTimeout, ResumeProgram, SuspendRate, SuspendTime, SuspendTimeout, SuspendProgram, SuspendExcNodes, and SuspendExcParts.

ResumeTimeout

Maximum time permitted (in second) between when a node is resume request is issued and when the node is actually available for use. Nodes which fail to respond in this time frame may be marked DOWN and the jobs scheduled on the node requeued. The default value is 60 seconds. Related configuration options include ResumeProgram, ResumeRate, SuspendRate, SuspendTime, SuspendTimeout, SuspendProgram, SuspendExcNodes and SuspendExcParts. More information is available at the SLURM web site ( http://slurm.schedmd.com/power_save.html ).

ResvEpilog

Fully qualified pathname of a program for the slurmctld to execute when a reservation ends. The program can be used to cancel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no epilog.

ResvOverRun

Describes how long a job already running in a reservation should be permitted to execute after the end time of the reservation has been reached. The time period is specified in minutes and the default value is 0 (kill the job immediately). The value may not exceed 65533 minutes, although a value of "UNLIMITED" is supported to permit a job to run indefinitely after its reservation is terminated.

ResvProlog

Fully qualified pathname of a program for the slurmctld to execute when a reservation begins. The program can be used to cancel jobs, modify partition configuration, etc. The reservation named will be passed as an argument to the program. By default there is no prolog.

ReturnToService

Controls when a DOWN node will be returned to service. The default value is 0. Supported values include

0

A node will remain in the DOWN state until a system administrator explicitly changes its state (even if the slurmd daemon registers and resumes communications).

1

A DOWN node will become available for use upon registration with a valid configuration only if it was set DOWN due to being non-responsive. If the node was set DOWN for any other reason (low memory, prolog failure, epilog failure, unexpected reboot, etc.), its state will not automatically be changed.

2

A DOWN node will become available for use upon registration with a valid configuration. The node could have been set DOWN for any reason. (Disabled on Cray systems.)

SallocDefaultCommand

Normally, salloc(1) will run the user's default shell when a command to execute is not specified on the salloc command line. If SallocDefaultCommand is specified, salloc will instead run the configured command. The command is passed to '/bin/sh -c', so shell metacharacters are allowed, and commands with multiple arguments should be quoted. For instance:

    SallocDefaultCommand = "$SHELL"

would run the shell in the user's $SHELL environment variable. and

    SallocDefaultCommand = "srun -n1 -N1 --mem-per-cpu=0 --pty --preserve-env --mpi=none $SHELL"

would run spawn the user's default shell on the allocated resources, but not consume any of the CPU or memory resources, configure it as a pseudo-terminal, and preserve all of the job's environment variables (i.e. and not over-write them with the job step's allocation information).

SchedulerParameters

The interpretation of this parameter varies by SchedulerType. Multiple options may be comma separated.

default_queue_depth=#

The default number of jobs to attempt scheduling (i.e. the queue depth) when a running job completes or other routine actions occur. The full queue will be tested on a less frequent basis. The default value is 100. In the case of large clusters (more than 1000 nodes), configuring a relatively small value may be desirable. Specifying a large value (say 1000 or higher) can be expected to result in poor system responsiveness since this scheduling logic will not release locks for other events to occur. It would be better to let the backfill scheduler process a larger number of jobs (see max_job_bf, bf_continue and other options here for more information).

defer

Setting this option will avoid attempting to schedule each job individually at job submit time, but defer it until a later time when scheduling multiple jobs simultaneously may be possible. This option may improve system responsiveness when large numbers of jobs (many hundreds) are submitted at the same time, but it will delay the initiation time of individual jobs. Also see default_queue_depth above.

bf_continue

The backfill scheduler periodically releases locks in order to permit other operations to proceed rather than blocking all activity for what could be an extended period of time. Setting this option will cause the backfill scheduler to continue processing pending jobs from its original job list after releasing locks even if job or node state changes. This can result in lower priority jobs from being backfill scheduled instead of newly arrived higher priority jobs, but will permit more queued jobs to be considered for backfill scheduling.

bf_interval=#

The number of seconds between iterations. Higher values result in less overhead and better responsiveness. The default value is 30 seconds. This option applies only to SchedulerType=sched/backfill.

bf_max_job_part=#

The maximum number of jobs per partition to attempt backfill scheduling for, not counting jobs which cannot be started due to an association resource limit. This can be especially helpful for systems with large numbers of partitions and jobs. The default value is 0, which means no limit. This option applies only to SchedulerType=sched/backfill.

bf_max_job_user=#

The maximum number of jobs per user to attempt backfill scheduling for, not counting jobs which cannot be started due to an association resource limit. One can set this limit to prevent users from flooding the backfill queue with jobs that cannot start and that prevent jobs from other users to start. This is similar to the MAXIJOB limit in Maui. The default value is 0, which means no limit. This option applies only to SchedulerType=sched/backfill.

bf_resolution=#

The number of seconds in the resolution of data maintained about when jobs begin and end. Higher values result in less overhead and better responsiveness. The default value is 60 seconds. This option applies only to SchedulerType=sched/backfill.

bf_window=#

The number of minutes into the future to look when considering jobs to schedule. Higher values result in more overhead and less responsiveness. The default value is 1440 minutes (one day). A value at least as long as the highest allowed time limit is generally advisable to prevent job starvation. In order limit the amount of data managed by the backfill scheduler, if the value of bf_window is increased, then it is generally advisable to also increase bf_resolution. if This option applies only to SchedulerType=sched/backfill.

max_job_bf=#

The maximum number of jobs to attempt backfill scheduling for (i.e. the queue depth). Higher values result in more overhead and less responsiveness. Until an attempt is made to backfill schedule a job, its expected initiation time value will not be set. The default value is 50. This option applies only to SchedulerType=sched/backfill.

max_depend_depth=#

Maximum number of jobs to test for a circular job dependency. Stop testing after this number of job dependencies have been tested. The default value is 10 jobs.

max_switch_wait=#

Maximum number of seconds that a job can delay execution waiting for the specified desired switch count. The default value is 300 seconds.

SchedulerPort

The port number on which slurmctld should listen for connection requests. This value is only used by the Maui Scheduler (see SchedulerType). The default value is 7321.

SchedulerRootFilter

Identifies whether or not RootOnly partitions should be filtered from any external scheduling activities. If set to 0, then RootOnly partitions are treated like any other partition. If set to 1, then RootOnly partitions are exempt from any external scheduling activities. The default value is 1. Currently only used by the built-in backfill scheduling module "sched/backfill" (see SchedulerType).

SchedulerTimeSlice

Number of seconds in each time slice when gang scheduling is enabled (PreemptMode=GANG). The value must be between 5 seconds and 65533 seconds. The default value is 30 seconds.

SchedulerType

Identifies the type of scheduler to be used. Note the slurmctld daemon must be restarted for a change in scheduler type to become effective (reconfiguring a running daemon has no effect for this parameter). The scontrol command can be used to manually change job priorities if desired. Acceptable values include:

sched/backfill

For a backfill scheduling module to augment the default FIFO scheduling. Backfill scheduling will initiate lower-priority jobs if doing so does not delay the expected initiation time of any higher priority job. Effectiveness of backfill scheduling is dependent upon users specifying job time limits, otherwise all jobs will have the same time limit and backfilling is impossible. Note documentation for the SchedulerParameters option above. This is the default configuration.

sched/builtin

This is the FIFO scheduler which initiates jobs in priority order. If any job in the partition can not be scheduled, no lower priority job in that partition will be scheduled. An exception is made for jobs can not run due to partition constraints (e.g. the time limit) or down/drained nodes. In that case, lower priority jobs can be initiated and not impact the higher priority job.

sched/gang

Defunct option. See PreemptType and PreemptMode options.

sched/hold

To hold all newly arriving jobs if a file "/etc/slurm.hold" exists otherwise use the built-in FIFO scheduler

sched/wiki

For the Wiki interface to the Maui Scheduler

sched/wiki2

For the Wiki interface to the Moab Cluster Suite

SelectType

Identifies the type of resource selection algorithm to be used. Changing this value can only be done by restarting the slurmctld daemon and will result in the loss of all job information (running and pending) since the job state save format used by each plugin is different. Acceptable values include

select/linear

for allocation of entire nodes assuming a one-dimensional array of nodes in which sequentially ordered nodes are preferable. This is the default value for non-BlueGene systems.

select/cons_res

The resources within a node are individually allocated as consumable resources. Note that whole nodes can be allocated to jobs for selected partitions by using the Shared=Exclusive option. See the partition Shared parameter for more information.

select/serial

for allocating resources to single CPU jobs only. Highly optimized for maximum throughput. NOTE: SPANK environment variables are NOT propagated to the job's Epilog program.

select/bluegene

for a three-dimensional BlueGene system. The default value is "select/bluegene" for BlueGene systems.

select/cray

for a Cray system. The default value is "select/cray" for all Cray systems.

SelectTypeParameters

The permitted values of SelectTypeParameters depend upon the configured value of SelectType. SelectType=select/bluegene supports no SelectTypeParameters. The only supported option for SelectType=select/linear are CR_ONE_TASK_PER_CORE and CR_Memory, which treats memory as a consumable resource and prevents memory over subscription with job preemption or gang scheduling. The following values are supported for SelectType=select/cons_res:

CR_ALLOCATE_FULL_SOCKET

Jobs are allocated whole sockets rather than individual cores. Must be used with CR_Socket or CR_Socket_Memory option.

CR_CPU

CPUs are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the desired minimum resource allocation. The node's Sockets, CoresPerSocket and ThreadsPerCore may also be configured if desired and may result in job allocations which have improved locality.

CR_CPU_Memory

CPUs and memory are consumable resources. Configure the number of CPUs on each node, which may be equal to the count of cores or hyper-threads on the node depending upon the desired minimum resource allocation. The node's Sockets, CoresPerSocket and ThreadsPerCore may also be configured if desired and may result in job allocations which have improved locality. Setting a value for DefMemPerCPU is strongly recommended.

CR_Core

Cores are consumable resources. On nodes with hyper-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated threads on the same core. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated core.

CR_Core_Memory

Cores and memory are consumable resources. On nodes with hyper-threads, each thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated threads on the same core. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated core. Setting a value for DefMemPerCPU is strongly recommended.

CR_ONE_TASK_PER_CORE

Allocate one task per core by default. Without this option, by default one task will be allocated per thread on nodes with more than one ThreadsPerCore configured.

CR_CORE_DEFAULT_DIST_BLOCK

Allocate cores within a node using block distribution by default. This is a pseudo-best-fit algorithm that minimizes the number of boards and minimizes the number of sockets (within minimum boards) used for the allocation. This default behavior can be overridden specifying a particular "-m" parameter with srun/salloc/sbatch. Without this option, cores will be allocated cyclicly across the sockets.

CR_Socket

Sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated socket.

CR_Socket_Memory

Memory and sockets are consumable resources. On nodes with multiple cores, each core or thread is counted as a CPU to satisfy a job's resource requirement, but multiple jobs are not allocated resources on the same socket. The count of CPUs allocated to a job may be rounded up to account for every CPU on an allocated socket. Setting a value for DefMemPerCPU is strongly recommended.

CR_Memory

Memory is a consumable resource. NOTE: This implies Shared=YES or Shared=FORCE for all partitions. Setting a value for DefMemPerCPU is strongly recommended.

SlurmUser

The name of the user that the slurmctld daemon executes as. For security purposes, a user other than "root" is recommended. This user must exist on all nodes of the cluster for authentication of communications between SLURM components. The default value is "root".

SlurmdUser

The name of the user that the slurmd daemon executes as. This user must exist on all nodes of the cluster for authentication of communications between SLURM components. The default value is "root".

SlurmctldDebug

The level of detail to provide slurmctld daemon's logs. The default value is info. If the slurmctld daemon is initiated with -v or --verbose options, that debug level will be preserve or restored upon reconfiguration.

quiet

Log nothing

fatal

Log only fatal errors

error

Log only errors

info

Log errors and general informational messages

verbose

Log errors and verbose informational messages

debug

Log errors and verbose informational messages and debugging messages

debug2

Log errors and verbose informational messages and more debugging messages

debug3

Log errors and verbose informational messages and even more debugging messages

debug4

Log errors and verbose informational messages and even more debugging messages

debug5

Log errors and verbose informational messages and even more debugging messages

SlurmctldLogFile

Fully qualified pathname of a file into which the slurmctld daemon's logs are written. The default value is none (performs logging via syslog).
See the section LOGGING if a pathname is specified.

SlurmctldPidFile

Fully qualified pathname of a file into which the slurmctld daemon may write its process id. This may be used for automated signal processing. The default value is "/var/run/slurmctld.pid".

SlurmctldPlugstack

A comma delimited list of SLURM controller plugins to be started when the daemon begins and terminated when it ends. Only the plugin's init and fini functions are called.

SlurmctldPort

The port number that the SLURM controller, slurmctld, listens to for work. The default value is SLURMCTLD_PORT as established at system build time. If none is explicitly specified, it will be set to 6817. SlurmctldPort may also be configured to support a range of port numbers in order to accept larger bursts of incoming messages by specifying two numbers separated by a dash (e.g. SlurmctldPort=6817-6818). NOTE: Either slurmctld and slurmd daemons must not execute on the same nodes or the values of SlurmctldPort and SlurmdPort must be different.

SlurmctldTimeout

The interval, in seconds, that the backup controller waits for the primary controller to respond before assuming control. The default value is 120 seconds. May not exceed 65533.

SlurmdDebug

The level of detail to provide slurmd daemon's logs. The default value is info.

quiet

Log nothing

fatal

Log only fatal errors

error

Log only errors

info

Log errors and general informational messages

verbose

Log errors and verbose informational messages

debug

Log errors and verbose informational messages and debugging messages

debug2

Log errors and verbose informational messages and more debugging messages

debug3

Log errors and verbose informational messages and even more debugging messages

debug4

Log errors and verbose informational messages and even more debugging messages

debug5

Log errors and verbose informational messages and even more debugging messages

SlurmdLogFile

Fully qualified pathname of a file into which the slurmd daemon's logs are written. The default value is none (performs logging via syslog). Any "%h" within the name is replaced with the hostname on which the slurmd is running. Any "%n" within the name is replaced with the SLURM node name on which the slurmd is running.
See the section LOGGING if a pathname is specified.

SlurmdPidFile

Fully qualified pathname of a file into which the slurmd daemon may write its process id. This may be used for automated signal processing. Any "%h" within the name is replaced with the hostname on which the slurmd is running. Any "%n" within the name is replaced with the SLURM node name on which the slurmd is running. The default value is "/var/run/slurmd.pid".

SlurmdPort

The port number that the SLURM compute node daemon, slurmd, listens to for work. The default value is SLURMD_PORT as established at system build time. If none is explicitly specified, its value will be 6818. NOTE: Either slurmctld and slurmd daemons must not execute on the same nodes or the values of SlurmctldPort and SlurmdPort must be different.

SlurmdSpoolDir

Fully qualified pathname of a directory into which the slurmd daemon's state information and batch job script information are written. This must be a common pathname for all nodes, but should represent a directory which is local to each node (reference a local file system). The default value is "/var/spool/slurmd". Any "%h" within the name is replaced with the hostname on which the slurmd is running. Any "%n" within the name is replaced with the SLURM node name on which the slurmd is running.

SlurmdTimeout

The interval, in seconds, that the SLURM controller waits for slurmd to respond before configuring that node's state to DOWN. A value of zero indicates the node will not be tested by slurmctld to confirm the state of slurmd, the node will not be automatically set to a DOWN state indicating a non-responsive slurmd, and some other tool will take responsibility for monitoring the state of each compute node and its slurmd daemon. SLURM's hierarchical communication mechanism is used to ping the slurmd daemons in order to minimize system noise and overhead. The default value is 300 seconds. The value may not exceed 65533 seconds.

SlurmSchedLogFile

Fully qualified pathname of the scheduling event logging file. The syntax of this parameter is the same as for SlurmctldLogFile. In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters.

SlurmSchedLogLevel

The initial level of scheduling event logging, similar to the SlurmctlDebug parameter used to control the initial level of slurmctld logging. Valid values for SlurmSchedLogLevel are "0" (scheduler logging disabled) and "1" (scheduler logging enabled). If this parameter is omitted, the value defaults to "0" (disabled). In order to configure scheduler logging, set both the SlurmSchedLogFile and SlurmSchedLogLevel parameters. The scheduler logging level can be changed dynamically using scontrol.

SrunEpilog

Fully qualified pathname of an executable to be run by srun following the completion of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --epilog parameter. Note that while the other "Epilog" executables (e.g., TaskEpilog) are run by slurmd on the compute nodes where the tasks are executed, the SrunEpilog runs on the node where the "srun" is executing.

SrunProlog

Fully qualified pathname of an executable to be run by srun prior to the launch of a job step. The command line arguments for the executable will be the command and arguments of the job step. This configuration parameter may be overridden by srun's --prolog parameter. Note that while the other "Prolog" executables (e.g., TaskProlog) are run by slurmd on the compute nodes where the tasks are executed, the SrunProlog runs on the node where the "srun" is executing.

StateSaveLocation

Fully qualified pathname of a directory into which the SLURM controller, slurmctld, saves its state (e.g. "/usr/local/slurm/checkpoint"). SLURM state will saved here to recover from system failures. SlurmUser must be able to create files in this directory. If you have a BackupController configured, this location should be readable and writable by both systems. Since all running and pending job information is stored here, the use of a reliable file system (e.g. RAID) is recommended. The default value is "/var/spool". If any slurm daemons terminate abnormally, their core files will also be written into this directory.

SuspendExcNodes

Specifies the nodes which are to not be placed in power save mode, even if the node remains idle for an extended period of time. Use SLURM's hostlist expression to identify nodes. By default no nodes are excluded. Related configuration options include ResumeTimeout, ResumeProgram, ResumeRate, SuspendProgram, SuspendRate, SuspendTime, SuspendTimeout, and SuspendExcParts.

SuspendExcParts

Specifies the partitions whose nodes are to not be placed in power save mode, even if the node remains idle for an extended period of time. Multiple partitions can be identified and separated by commas. By default no nodes are excluded. Related configuration options include ResumeTimeout, ResumeProgram, ResumeRate, SuspendProgram, SuspendRate, SuspendTime SuspendTimeout, and SuspendExcNodes.

SuspendProgram

SuspendProgram is the program that will be executed when a node remains idle for an extended period of time. This program is expected to place the node into some power save mode. This can be used to reduce the frequency and voltage of a node or completely power the node off. The program executes as SlurmUser. The argument to the program will be the names of nodes to be placed into power savings mode (using SLURM's hostlist expression format). By default, no program is run. Related configuration options include ResumeTimeout, ResumeProgram, ResumeRate, SuspendRate, SuspendTime, SuspendTimeout, SuspendExcNodes, and SuspendExcParts.

SuspendRate

The rate at which nodes are place into power save mode by SuspendProgram. The value is number of nodes per minute and it can be used to prevent a large drop in power power consumption (e.g. after a large job completes). A value of zero results in no limits being imposed. The default value is 60 nodes per minute. Related configuration options include ResumeTimeout, ResumeProgram, ResumeRate, SuspendProgram, SuspendTime, SuspendTimeout, SuspendExcNodes, and SuspendExcParts.

SuspendTime

Nodes which remain idle for this number of seconds will be placed into power save mode by SuspendProgram. A value of -1 disables power save mode and is the default. Related configuration options include ResumeTimeout, ResumeProgram, ResumeRate, SuspendProgram, SuspendRate, SuspendTimeout, SuspendExcNodes, and SuspendExcParts.

SuspendTimeout

Maximum time permitted (in second) between when a node suspend request is issued and when the node shutdown. At that time the node must ready for a resume request to be issued as needed for new work. The default value is 30 seconds. Related configuration options include ResumeProgram, ResumeRate, ResumeTimeout, SuspendRate, SuspendTime, SuspendProgram, SuspendExcNodes and SuspendExcParts. More information is available at the SLURM web site ( http://slurm.schedmd.com/power_save.html ).

SwitchType

Identifies the type of switch or interconnect used for application communications. Acceptable values include "switch/none" for switches not requiring special processing for job launch or termination (Myrinet, Ethernet, and InfiniBand) and "switch/nrt" for IBM's Network Resource Table API. The default value is "switch/none". All SLURM daemons, commands and running jobs must be restarted for a change in SwitchType to take effect. If running jobs exist at the time slurmctld is restarted with a new value of SwitchType, records of all jobs in any state may be lost.

TaskEpilog

Fully qualified pathname of a program to be execute as the slurm job's owner after termination of each task. See TaskProlog for execution order details.

TaskPlugin

Identifies the type of task launch plugin, typically used to provide resource management within a node (e.g. pinning tasks to specific processors). More than one task plugin can be specified in a comma separated list. The prefix of "task/" is optional. Acceptable values include:

task/affinity

enables resource containment using CPUSETs. This enables the --cpu_bind and/or --mem_bind srun options. If you use "task/affinity" and encounter problems, it may be due to the variety of system calls used to implement task affinity on different operating systems. If that is the case, you may want to install Portable Linux Process Affinity (PLPA, see http://www.open-mpi.org/software/plpa), which is supported by SLURM.

task/cgroup

enables resource containment using Linux control cgroups. This enables the --cpu_bind and/or --mem_bind srun options. NOTE: see "man cgroup.conf" for configuration details. NOTE: This plugin writes to disk and can slightly impact performance. If you are running lots of short running jobs (less than a couple of seconds) this plugin slows down performance slightly. It should probably be avoided in an HTC environment.

task/none

for systems requiring no special handling of user tasks. Lacks support for the --cpu_bind and/or --mem_bind srun options. The default value is "task/none".

TaskPluginParam

Optional parameters for the task plugin. Multiple options should be comma separated If None, Sockets, Cores, Threads, and/or Verbose are specified, they will override the --cpu_bind option specified by the user in the srun command. None, Sockets, Cores and Threads are mutually exclusive and since they decrease scheduling flexibility are not generally recommended (select no more than one of them). Cpusets and Sched are mutually exclusive (select only one of them).

Cores

Always bind to cores. Overrides user options or automatic binding.

Cpusets

Use cpusets to perform task affinity functions. By default, Sched task binding is performed.

None

Perform no task binding. Overrides user options or automatic binding.

Sched

Use sched_setaffinity or plpa_sched_setaffinity (if available) to bind tasks to processors.

Sockets

Always bind to sockets. Overrides user options or automatic binding.

Threads

Always bind to threads. Overrides user options or automatic binding.

Verbose

Verbosely report binding before tasks run. Overrides user options.

TaskProlog

Fully qualified pathname of a program to be execute as the slurm job's owner prior to initiation of each task. Besides the normal environment variables, this has SLURM_TASK_PID available to identify the process ID of the task being started. Standard output from this program can be used to control the environment variables and output for the user program.

export NAME=value

Will set environment variables for the task being spawned. Everything after the equal sign to the end of the line will be used as the value for the environment variable. Exporting of functions is not currently supported.

print ...

Will cause that line (without the leading "print ") to be printed to the job's standard output.

unset NAME

Will clear environment variables for the task being spawned.

The order of task prolog/epilog execution is as follows:

1. pre_launch_priv()

Function in TaskPlugin

1. pre_launch()

Function in TaskPlugin

2. TaskProlog

System-wide per task program defined in slurm.conf

3. user prolog

Job step specific task program defined using srun's --task-prolog option or SLURM_TASK_PROLOG environment variable

4. Execute the job step's task

5. user epilog

Job step specific task program defined using srun's --task-epilog option or SLURM_TASK_EPILOG environment variable

6. TaskEpilog

System-wide per task program defined in slurm.conf

7. post_term()

Function in TaskPlugin

TmpFS

Fully qualified pathname of the file system available to user jobs for temporary storage. This parameter is used in establishing a node's TmpDisk space. The default value is "/tmp".

TopologyPlugin

Identifies the plugin to be used for determining the network topology and optimizing job allocations to minimize network contention. See NETWORK TOPOLOGY below for details. Additional plugins may be provided in the future which gather topology information directly from the network. Acceptable values include:

topology/3d_torus

default for Sun Constellation systems, best-fit logic over three-dimensional topology

topology/node_rank

orders nodes based upon information a node_rank field in the node record as generated by a select plugin. SLURM performs a best-fit algorithm over those ordered nodes

topology/none

default for other systems, best-fit logic over one-dimensional topology

topology/tree

used for a hierarchical network as described in a topology.conf file

TrackWCKey

Boolean yes or no. Used to set display and track of the Workload Characterization Key. Must be set to track wckey usage.

TreeWidth

Slurmd daemons use a virtual tree network for communications. TreeWidth specifies the width of the tree (i.e. the fanout). On architectures with a front end node running the slurmd daemon, the value must always be equal to or greater than the number of front end nodes which eliminates the need for message forwarding between the slurmd daemons. On other architectures the default value is 50, meaning each slurmd daemon can communicate with up to 50 other slurmd daemons and over 2500 nodes can be contacted with two message hops. The default value will work well for most clusters. Optimal system performance can typically be achieved if TreeWidth is set to the square root of the number of nodes in the cluster for systems having no more than 2500 nodes or the cube root for larger systems. The value may not exceed 65533.

UnkillableStepProgram

If the processes in a job step are determined to be unkillable for a period of time specified by the UnkillableStepTimeout variable, the program specified by UnkillableStepProgram will be executed. This program can be used to take special actions to clean up the unkillable processes and/or notify computer administrators. The program will be run SlurmdUser (usually "root"). By default no program is run.

UnkillableStepTimeout

The length of time, in seconds, that SLURM will wait before deciding that processes in a job step are unkillable (after they have been signaled with SIGKILL) and execute UnkillableStepProgram as described above. The default timeout value is 60 seconds.

UsePAM

If set to 1, PAM (Pluggable Authentication Modules for Linux) will be enabled. PAM is used to establish the upper bounds for resource limits. With PAM support enabled, local system administrators can dynamically configure system resource limits. Changing the upper bound of a resource limit will not alter the limits of running jobs, only jobs started after a change has been made will pick up the new limits. The default value is 0 (not to enable PAM support). Remember that PAM also needs to be configured to support SLURM as a service. For sites using PAM's directory based configuration option, a configuration file named slurm should be created. The module-type, control-flags, and module-path names that should be included in the file are:
auth required pam_localuser.so
auth required pam_shells.so
account required pam_unix.so
account required pam_access.so
session required pam_unix.so
For sites configuring PAM with a general configuration file, the appropriate lines (see above), where slurm is the service-name, should be added.

VSizeFactor

Memory specifications in job requests apply to real memory size (also known as resident set size). It is possible to enforce virtual memory limits for both jobs and job steps by limiting their virtual memory to some percentage of their real memory allocation. The VSizeFactor parameter specifies the job's or job step's virtual memory limit as a percentage of its real memory limit. For example, if a job's real memory limit is 500MB and VSizeFactor is set to 101 then the job will be killed if its real memory exceeds 500MB or its virtual memory exceeds 505MB (101 percent of the real memory limit). The default valus is 0, which disables enforcement of virtual memory limits. The value may not exceed 65533 percent.

WaitTime

Specifies how many seconds the srun command should by default wait after the first task terminates before terminating all remaining tasks. The "--wait" option on the srun command line overrides this value. The default value is 0, which disables this feature. May not exceed 65533 seconds.

The configuration of nodes (or machines) to be managed by SLURM is also specified in /etc/slurm.conf. Changes in node configuration (e.g. adding nodes, changing their processor count, etc.) require restarting both the slurmctld daemon and the slurmd daemons. All slurmd daemons must know each node in the system to forward messages in support of hierarchical communications. Only the NodeName must be supplied in the configuration file. All other node configuration information is optional. It is advisable to establish baseline node configurations, especially if the cluster is heterogeneous. Nodes which register to the system with less than the configured resources (e.g. too little memory), will be placed in the "DOWN" state to avoid scheduling jobs on them. Establishing baseline configurations will also speed SLURM's scheduling process by permitting it to compare job requirements against these (relatively few) configuration parameters and possibly avoid having to check job requirements against every individual node's configuration. The resources checked at node registration time are: CPUs, RealMemory and TmpDisk. While baseline values for each of these can be established in the configuration file, the actual values upon node registration are recorded and these actual values may be used for scheduling purposes (depending upon the value of FastSchedule in the configuration file.

Default values can be specified with a record in which NodeName is "DEFAULT". The default entry values will apply only to lines following it in the configuration file and the default values can be reset multiple times in the configuration file with multiple entries where "NodeName=DEFAULT". Each line where NodeName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. The "NodeName=" specification must be placed on every line describing the configuration of nodes. A single node name can not appear as a NodeName value in more than one line (duplicate node name records will be ignored). In fact, it is generally possible and desirable to define the configurations of all nodes in only a few lines. This convention permits significant optimization in the scheduling of larger clusters. In order to support the concept of jobs requiring consecutive nodes on some architectures, node specifications should be place in this file in consecutive order. No single node name may be listed more than once in the configuration file. Use "DownNodes=" to record the state of nodes which are temporarily in a DOWN, DRAIN or FAILING state without altering permanent configuration information. A job step's tasks are allocated to nodes in order the nodes appear in the configuration file. There is presently no capability within SLURM to arbitrarily order a job step's tasks.

Multiple node names may be comma separated (e.g. "alpha,beta,gamma") and/or a simple node range expression may optionally be used to specify numeric ranges of nodes to avoid building a configuration file with large numbers of entries. The node range expression can contain one pair of square brackets with a sequence of comma separated numbers and/or ranges of numbers separated by a "-" (e.g. "linux[0-64,128]", or "lx[15,18,32-33]"). Note that the numeric ranges can include one or more leading zeros to indicate the numeric portion has a fixed number of digits (e.g. "linux[0000-1023]"). Up to two numeric ranges can be included in the expression (e.g. "rack[0-63]_blade[0-41]"). If one or more numeric expressions are included, one of them must be at the end of the name (e.g. "unit[0-31]rack" is invalid), but arbitrary names can always be used in a comma separated list.

On BlueGene systems only, the square brackets should contain pairs of three digit numbers separated by a "x". These numbers indicate the boundaries of a rectangular prism (e.g. "bgl[000x144,400x544]"). See BlueGene documentation for more details. The node configuration specified the following information:

NodeName

Name that SLURM uses to refer to a node (or base partition for BlueGene systems). Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). Only short hostname forms are compatible with the switch/elan, switch/federation and switch/nrt plugins at this time. It may also be an arbitrary string if NodeHostname is specified. If the NodeName is "DEFAULT", the values specified with that record will apply to subsequent node specifications unless explicitly set to other values in that node record or replaced with a different set of default values. Each line where NodeName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. For architectures in which the node order is significant, nodes will be considered consecutive in the order defined. For example, if the configuration for "NodeName=charlie" immediately follows the configuration for "NodeName=baker" they will be considered adjacent in the computer.

NodeHostname

Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). Only short hostname forms are compatible with the switch/elan, switch/federation and switch/nrt plugins at this time. A node range expression can be used to specify a set of nodes. If an expression is used, the number of nodes identified by NodeHostname on a line in the configuration file must be identical to the number of nodes identified by NodeName. By default, the NodeHostname will be identical in value to NodeName.

NodeAddr

Name that a node should be referred to in establishing a communications path. This name will be used as an argument to the gethostbyname() function for identification. If a node range expression is used to designate multiple nodes, they must exactly match the entries in the NodeName (e.g. "NodeName=lx[0-7] NodeAddr="elx[0-7]"). NodeAddr may also contain IP addresses. By default, the NodeAddr will be identical in value to NodeHostname.

Boards

Number of Baseboards in nodes with a baseboard controller. Note that when Boards is specified, SocketsPerBoard, CoresPerSocket, and ThreadsPerCore should be specified. Boards and CPUs are mutually exclusive. The default value is 1.

CoresPerSocket

Number of cores in a single physical processor socket (e.g. "2"). The CoresPerSocket value describes physical cores, not the logical number of processors per socket. NOTE: If you have multi-core processors, you will likely need to specify this parameter in order to optimize scheduling. The default value is 1.

CPUs

Number of logical processors on the node (e.g. "2"). If CPUs is omitted, it will set equal to the product of Sockets, CoresPerSocket, and ThreadsPerCore. CPUs and Boards are mutually exclusive. The default value is 1.

Feature

A comma delimited list of arbitrary strings indicative of some characteristic associated with the node. There is no value associated with a feature at this time, a node either has a feature or it does not. If desired a feature may contain a numeric component indicating, for example, processor speed. By default a node has no features. Also see Gres.

Gres

A comma delimited list of generic resources specifications for a node. Each resource specification consists of a name followed by an optional colon with a numeric value (default value is one) (e.g. "Gres=bandwidth:10000,gpu:2"). A suffix of "K", "M" or "G" may be used to multiply the number by 1024, 1048576 or 1073741824 respectively (e.g. "Gres=bandwidth:4G,gpu:4").. By default a node has no generic resources and its maximum count is 4,294,967,295. Also see Feature.

Port

The port number that the SLURM compute node daemon, slurmd, listens to for work on this particular node. By default there is a single port number for all slurmd daemons on all compute nodes as defined by the SlurmdPort configuration parameter. Use of this option is not generally recommended except for development or testing purposes. If multiple slurmd daemons execute on a node this can specify a range of ports

Procs

See CPUs.

RealMemory

Size of real memory on the node in MegaBytes (e.g. "2048"). The default value is 1.

Reason

Identifies the reason for a node being in state "DOWN", "DRAINED" "DRAINING", "FAIL" or "FAILING". Use quotes to enclose a reason having more than one word.

Sockets

Number of physical processor sockets/chips on the node (e.g. "2"). If Sockets is omitted, it will be inferred from CPUs, CoresPerSocket, and ThreadsPerCore. NOTE: If you have multi-core processors, you will likely need to specify these parameters. Sockets and SocketsPerBoard are mutually exclusive. If Sockets is specified when Boards is also used, Sockets is interpreted as SocketsPerBoard rather than total sockets. The default value is 1.

SocketsPerBoard

Number of physical processor sockets/chips on a baseboard. Sockets and SocketsPerBoard are mutually exclusive. The default value is 1.

State

State of the node with respect to the initiation of user jobs. Acceptable values are "DOWN", "DRAIN", "FAIL", "FAILING" and "UNKNOWN". "DOWN" indicates the node failed and is unavailable to be allocated work. "DRAIN" indicates the node is unavailable to be allocated work. "FAIL" indicates the node is expected to fail soon, has no jobs allocated to it, and will not be allocated to any new jobs. "FAILING" indicates the node is expected to fail soon, has one or more jobs allocated to it, but will not be allocated to any new jobs. "UNKNOWN" indicates the node's state is undefined (BUSY or IDLE), but will be established when the slurmd daemon on that node registers. The default value is "UNKNOWN". Also see the DownNodes parameter below.

ThreadsPerCore

Number of logical threads in a single physical core (e.g. "2"). Note that the SLURM can allocate resources to jobs down to the resolution of a core. If your system is configured with more than one thread per core, execution of a different job on each thread is not supported unless you configure SelectTypeParameters=CR_CPU plus CPUs; do not configure Sockets, CoresPerSocket or ThreadsPerCore. A job can execute a one task per thread from within one job step or execute a distinct job step on each of the threads. Note also if you are running with more than 1 thread per core and running the select/cons_res plugin you will want to set the SelectTypeParameters variable to something other than CR_CPU to avoid unexpected results. The default value is 1.

TmpDisk

Total size of temporary disk storage in TmpFS in MegaBytes (e.g. "16384"). TmpFS (for "Temporary File System") identifies the location which jobs should use for temporary storage. Note this does not indicate the amount of free space available to the user on the node, only the total file system size. The system administration should insure this file system is purged as needed so that user jobs have access to most of this space. The Prolog and/or Epilog programs (specified in the configuration file) might be used to insure the file system is kept clean. The default value is 0.

Weight

The priority of the node for scheduling purposes. All things being equal, jobs will be allocated the nodes with the lowest weight which satisfies their requirements. For example, a heterogeneous collection of nodes might be placed into a single partition for greater system utilization, responsiveness and capability. It would be preferable to allocate smaller memory nodes rather than larger memory nodes if either will satisfy a job's requirements. The units of weight are arbitrary, but larger weights should be assigned to nodes with more processors, memory, disk space, higher processor speed, etc. Note that if a job allocation request can not be satisfied using the nodes with the lowest weight, the set of nodes with the next lowest weight is added to the set of nodes under consideration for use (repeat as needed for higher weight values). If you absolutely want to minimize the number of higher weight nodes allocated to a job (at a cost of higher scheduling overhead), give each node a distinct Weight value and they will be added to the pool of nodes being considered for scheduling individually. The default value is 1.

The "DownNodes=" configuration permits you to mark certain nodes as in a DOWN, DRAIN, FAIL, or FAILING state without altering the permanent configuration information listed under a "NodeName=" specification.

DownNodes

Any node name, or list of node names, from the "NodeName=" specifications.

Reason

Identifies the reason for a node being in state "DOWN", "DRAIN", "FAIL" or "FAILING. Use quotes to enclose a reason having more than one word.

State

State of the node with respect to the initiation of user jobs. Acceptable values are "BUSY", "DOWN", "DRAIN", "FAIL", "FAILING, "IDLE", and "UNKNOWN".

CLOUD

Indicates the node exists in the cloud. It's initial state will be treated as powered down. The node will be available for use after it's state is recovered from SLURM's state save file or the slurmd daemon starts on the compute node.

DOWN

Indicates the node failed and is unavailable to be allocated work.

DRAIN

Indicates the node is unavailable to be allocated work.on.

FAIL

Indicates the node is expected to fail soon, has no jobs allocated to it, and will not be allocated to any new jobs.

FAILING

Indicates the node is expected to fail soon, has one or more jobs allocated to it, but will not be allocated to any new jobs.

FUTURE

Indicates the node is defined for future use and need not exist when the SLURM daemons are started. These nodes can be made available for use simply by updating the node state using the scontrol command rather than restarting the slurmctld daemon. After these nodes are made available, change their State in the slurm.conf file. Until these nodes are made available, they will not be seen using any SLURM commands or nor will any attempt be made to contact them.

UNKNOWN

Indicates the node's state is undefined (BUSY or IDLE), but will be established when the slurmd daemon on that node registers. The default value is "UNKNOWN".

On computers where frontend nodes are used to execute batch scripts rather than compute nodes (BlueGene or Cray systems), one may configure one or more frontend nodes using the configuration parameters defined below. These options are very similar to those used in configuring compute nodes. These options may only be used on systems configured and built with the appropriate parameters (--have-front-end, --enable-bluegene-emulation) or a system determined to have the appropriate architecture by the configure script (BlueGene or Cray systems). The front end configuration specifies the following information:

AllowGroups

Comma separated list of group names which may execute jobs on this front end node. By default, all groups may use this front end node. May not be used with the DenyGroups option.

AllowUsers

Comma separated list of user names which may execute jobs on this front end node. By default, all users may use this front end node. May not be used with the DenyUsers option.

DenyGroups

Comma separated list of group names which are prevented from executing jobs on this front end node. May not be used with the AllowGroups option.

DenyUsers

Comma separated list of user names which are prevented from executing jobs on this front end node. May not be used with the AllowUsers option.

FrontendName

Name that SLURM uses to refer to a frontend node. Typically this would be the string that "/bin/hostname -s" returns. It may also be the fully qualified domain name as returned by "/bin/hostname -f" (e.g. "foo1.bar.com"), or any valid domain name associated with the host through the host database (/etc/hosts) or DNS, depending on the resolver settings. Note that if the short form of the hostname is not used, it may prevent use of hostlist expressions (the numeric portion in brackets must be at the end of the string). If the FrontendName is "DEFAULT", the values specified with that record will apply to subsequent node specifications unless explicitly set to other values in that frontend node record or replaced with a different set of default values. Each line where FrontendName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. Note that since the naming of front end nodes would typically not follow that of the compute nodes (e.g. lacking X, Y and Z coordinates found in the compute node naming scheme), each front end node name should be listed separately and without a hostlist expression (i.e. frontend00,frontend01" rather than "frontend[00-01]").</p>

FrontendAddr

Name that a frontend node should be referred to in establishing a communications path. This name will be used as an argument to the gethostbyname() function for identification. As with FrontendName, list the individual node addresses rather than using a hostlist expression. The number of FrontendAddr records per line must equal the number of FrontendName records per line (i.e. you can't map to node names to one address). FrontendAddr may also contain IP addresses. By default, the FrontendAddr will be identical in value to FrontendName.

Port

The port number that the SLURM compute node daemon, slurmd, listens to for work on this particular frontend node. By default there is a single port number for all slurmd daemons on all frontend nodes as defined by the SlurmdPort configuration parameter. Use of this option is not generally recommended except for development or testing purposes.

Reason

Identifies the reason for a frontend node being in state "DOWN", "DRAINED" "DRAINING", "FAIL" or "FAILING". Use quotes to enclose a reason having more than one word.

State

State of the frontend node with respect to the initiation of user jobs. Acceptable values are "DOWN", "DRAIN", "FAIL", "FAILING" and "UNKNOWN". "DOWN" indicates the frontend node has failed and is unavailable to be allocated work. "DRAIN" indicates the frontend node is unavailable to be allocated work. "FAIL" indicates the frontend node is expected to fail soon, has no jobs allocated to it, and will not be allocated to any new jobs. "FAILING" indicates the frontend node is expected to fail soon, has one or more jobs allocated to it, but will not be allocated to any new jobs. "UNKNOWN" indicates the frontend node's state is undefined (BUSY or IDLE), but will be established when the slurmd daemon on that node registers. The default value is "UNKNOWN". Also see the DownNodes parameter below.

For example: "FrontendName=frontend[00-03] FrontendAddr=efrontend[00-03] State=UNKNOWN" is used to define four front end nodes for running slurmd daemons.

The partition configuration permits you to establish different job limits or access controls for various groups (or partitions) of nodes. Nodes may be in more than one partition, making partitions serve as general purpose queues. For example one may put the same set of nodes into two different partitions, each with different constraints (time limit, job sizes, groups allowed to use the partition, etc.). Jobs are allocated resources within a single partition. Default values can be specified with a record in which PartitionName is "DEFAULT". The default entry values will apply only to lines following it in the configuration file and the default values can be reset multiple times in the configuration file with multiple entries where "PartitionName=DEFAULT". The "PartitionName=" specification must be placed on every line describing the configuration of partitions. Each line where PartitionName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values. A single partition name can not appear as a PartitionName value in more than one line (duplicate partition name records will be ignored). If a partition that is in use is deleted from the configuration and slurm is restarted or reconfigured (scontrol reconfigure), jobs using the partition are canceled. NOTE: Put all parameters for each partition on a single line. Each line of partition configuration information should represent a different partition. The partition configuration file contains the following information:

AllocNodes

Comma separated list of nodes from which users can submit jobs in the partition. Node names may be specified using the node range expression syntax described above. The default value is "ALL".

AllowGroups

Comma separated list of group names which may execute jobs in the partition. If at least one group associated with the user attempting to execute the job is in AllowGroups, he will be permitted to use this partition. Jobs executed as user root can use any partition without regard to the value of AllowGroups. If user root attempts to execute a job as another user (e.g. using srun's --uid option), this other user must be in one of groups identified by AllowGroups for the job to successfully execute. The default value is "ALL". NOTE: For performance reasons, SLURM maintains a list of user IDs allowed to use each partition and this is checked at job submission time. This list of user IDs is updated when the slurmctld daemon is restarted, reconfigured (e.g. "scontrol reconfig") or the partition's AllowGroups value is reset, even if is value is unchanged (e.g. "scontrol update PartitionName=name AllowGroups=group"). For a user's access to a partition to change, both his group membership must change and SLURM's internal user ID list must change using one of the methods described above.

Alternate

Partition name of alternate partition to be used if the state of this partition is "DRAIN" or "INACTIVE."

Default

If this keyword is set, jobs submitted without a partition specification will utilize this partition. Possible values are "YES" and "NO". The default value is "NO".

DefMemPerCPU

Default real memory size available per allocated CPU in MegaBytes. Used to avoid over-subscribing memory and causing paging. DefMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res). If not set, the DefMemPerCPU value for the entire cluster will be used. Also see DefMemPerNode and MaxMemPerCPU. DefMemPerCPU and DefMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

DefMemPerNode

Default real memory size available per allocated node in MegaBytes. Used to avoid over-subscribing memory and causing paging. DefMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are shared (Shared=yes or Shared=force). If not set, the DefMemPerNode value for the entire cluster will be used. Also see DefMemPerCPU and MaxMemPerNode. DefMemPerCPU and DefMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

DefaultTime

Run time limit used for jobs that don't specify a value. If not set then MaxTime will be used. Format is the same as for MaxTime.

DisableRootJobs

If set to "YES" then user root will be prevented from running any jobs on this partition. The default value will be the value of DisableRootJobs set outside of a partition specification (which is "NO", allowing user root to execute jobs).

GraceTime

Specifies, in units of seconds, the preemption grace time to be extended to a job which has been selected for preemption. The default value is zero, no preemption grace time is allowed on this partition. (Meaningful only for PreemptMode=CANCEL)

Hidden

Specifies if the partition and its jobs are to be hidden by default. Hidden partitions will by default not be reported by the SLURM APIs or commands. Possible values are "YES" and "NO". The default value is "NO". Note that partitions that a user lacks access to by virtue of the AllowGroups parameter will also be hidden by default.

MaxCPUsPerNode

Maximum number of CPUs on any node available to all jobs from this partition. This can be especially useful to schedule GPUs. For example a node can be associated with two Slurm partitions (e.g. "cpu" and "gpu") and the partition/queue "cpu" could be limited to only a subset of the node's CPUs, insuring that one or more CPUs would be available to jobs in the "gpu" partition/queue.

MaxMemPerCPU

Maximum real memory size available per allocated CPU in MegaBytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerCPU would generally be used if individual processors are allocated to jobs (SelectType=select/cons_res). If not set, the MaxMemPerCPU value for the entire cluster will be used. Also see DefMemPerCPU and MaxMemPerNode. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

MaxMemPerNode

Maximum real memory size available per allocated node in MegaBytes. Used to avoid over-subscribing memory and causing paging. MaxMemPerNode would generally be used if whole nodes are allocated to jobs (SelectType=select/linear) and resources are shared (Shared=yes or Shared=force). If not set, the MaxMemPerNode value for the entire cluster will be used. Also see DefMemPerNode and MaxMemPerCPU. MaxMemPerCPU and MaxMemPerNode are mutually exclusive. NOTE: Enforcement of memory limits currently requires enabling of accounting, which samples memory use on a periodic basis (data need not be stored, just collected).

MaxNodes

Maximum count of nodes which may be allocated to any single job. For BlueGene systems this will be a c-nodes count and will be converted to a midplane count with a reduction in resolution. The default value is "UNLIMITED", which is represented internally as -1. This limit does not apply to jobs executed by SlurmUser or user root.

MaxTime

Maximum run time limit for jobs. Format is minutes, minutes:seconds, hours:minutes:seconds, days-hours, days-hours:minutes, days-hours:minutes:seconds or "UNLIMITED". Time resolution is one minute and second values are rounded up to the next minute. This limit does not apply to jobs executed by SlurmUser or user root.

MinNodes

Minimum count of nodes which may be allocated to any single job. For BlueGene systems this will be a c-nodes count and will be converted to a midplane count with a reduction in resolution. The default value is 1. This limit does not apply to jobs executed by SlurmUser or user root.

Nodes

Comma separated list of nodes (or base partitions for BlueGene systems) which are associated with this partition. Node names may be specified using the node range expression syntax described above. A blank list of nodes (i.e. "Nodes= ") can be used if one wants a partition to exist, but have no resources (possibly on a temporary basis).

PartitionName

Name by which the partition may be referenced (e.g. "Interactive"). This name can be specified by users when submitting jobs. If the PartitionName is "DEFAULT", the values specified with that record will apply to subsequent partition specifications unless explicitly set to other values in that partition record or replaced with a different set of default values. Each line where PartitionName is "DEFAULT" will replace or add to previous default values and not a reinitialize the default values.

PreemptMode

Mechanism used to preempt jobs from this partition when PreemptType=preempt/partition_prio is configured. This partition specific PreemptMode configuration parameter will override the PreemptMode configuration parameter set for the cluster as a whole. The cluster-level PreemptMode must include the GANG option if PreemptMode is configured to SUSPEND for any partition. The cluster-level PreemptMode must not be OFF if PreemptMode is enabled for any partition. See the description of the cluster-level PreemptMode configuration parameter above for further information.

Priority

Jobs submitted to a higher priority partition will be dispatched before pending jobs in lower priority partitions and if possible they will preempt running jobs from lower priority partitions. Note that a partition's priority takes precedence over a job's priority. The value may not exceed 65533.

ReqResv

Specifies users of this partition are required to designate a reservation when submitting a job. This option can be useful in restricting usage of a partition that may have higher priority or additional resources to be allowed only within a reservation. Possible values are "YES" and "NO". The default value is "NO".

RootOnly

Specifies if only user ID zero (i.e. user root) may allocate resources in this partition. User root may allocate resources for any other user, but the request must be initiated by user root. This option can be useful for a partition to be managed by some external entity (e.g. a higher-level job manager) and prevents users from directly using those resources. Possible values are "YES" and "NO". The default value is "NO".

SelectTypeParameters

Partition-specific resource allocation type. Supported values are CR_Core and CR_Socket. Use requires the system-wide SelectTypeParameters value be set plus CR_ALLOCATE_FULL_SOCKET.

Shared

Controls the ability of the partition to execute more than one job at a time on each resource (node, socket or core depending upon the value of SelectTypeParameters). If resources are to be shared, avoiding memory over-subscription is very important. SelectTypeParameters should be configured to treat memory as a consumable resource and the --mem option should be used for job allocations. Sharing of resources is typically useful only when using gang scheduling (PreemptMode=suspend or PreemptMode=kill). Possible values for Shared are "EXCLUSIVE", "FORCE", "YES", and "NO". Note that a value of "YES" or "FORCE" can negatively impact performance for systems with many thousands of running jobs. The default value is "NO". For more information see the following web pages:
http://slurm.schedmd.com/cons_res.html,
http://slurm.schedmd.com/cons_res_share.html,
http://slurm.schedmd.com/gang_scheduling.html, and
http://slurm.schedmd.com/preempt.html.

EXCLUSIVE

Allocates entire nodes to jobs even with select/cons_res configured. Jobs that run in partitions with "Shared=EXCLUSIVE" will have exclusive access to all allocated nodes.

FORCE

Makes all resources in the partition available for sharing without any means for users to disable it. May be followed with a colon and maximum number of jobs in running or suspended state. For example "Shared=FORCE:4" enables each node, socket or core to execute up to four jobs at once. Recommended only for BlueGene systems configured with small blocks or for systems running with gang scheduling (SchedulerType=sched/gang).

YES

Makes all resources in the partition available for sharing upon request by the job. Resources will only be over-subscribed when explicitly requested by the user using the "--share" option on job submission. May be followed with a colon and maximum number of jobs in running or suspended state. For example "Shared=YES:4" enables each node, socket or core to execute up to four jobs at once. Recommended only for systems running with gang scheduling (SchedulerType=sched/gang).

NO

Selected resources are allocated to a single job. No resource will be allocated to more than one job.

State

State of partition or availability for use. Possible values are "UP", "DOWN", "DRAIN" and "INACTIVE". The default value is "UP". See also the related "Alternate" keyword.

UP

Designates that new jobs may queued on the partition, and that jobs may be allocated nodes and run from the partition.

DOWN

Designates that new jobs may be queued on the partition, but queued jobs may not be allocated nodes and run from the partition. Jobs already running on the partition continue to run. The jobs must be explicitly canceled to force their termination.

DRAIN

Designates that no new jobs may be queued on the partition (job submission requests will be denied with an error message), but jobs already queued on the partition may be allocated nodes and run. See also the "Alternate" partition specification.

INACTIVE

Designates that no new jobs may be queued on the partition, and jobs already queued may not be allocated nodes and run. See also the "Alternate" partition specification.

Prolog and Epilog Scripts

There are a variety of prolog and epilog program options that execute with various permissions and at various times. The four options most likely to be used are: Prolog and Epilog (executed once on each compute node for each job) plus PrologSlurmctld and EpilogSlurmctld (executed once on the ControlMachine for each job).

NOTE: Standard output and error messages are normally not preserved. Explicitly write output and error messages to an appropriate location if you wish to preserve that information.

NOTE: The Prolog script is ONLY run on any individual node when it first sees a job step from a new allocation; it does not run the Prolog immediately when an allocation is granted. If no job steps from an allocation are run on a node, it will never run the Prolog for that allocation. The Epilog, on the other hand, always runs on every node of an allocation when the allocation is released.

If the Epilog fails (returns a non-zero exit code), this will result in the node being set to a DOWN state. If the EpilogSlurmctld fails (returns a non-zero exit code), this will only be logged. If the Prolog fails (returns a non-zero exit code), this will result in the node being set to a DOWN state and the job requeued to executed on another node. If the PrologSlurmctld fails (returns a non-zero exit code), this will result in the job requeued to executed on another node if possible. Only batch jobs can be requeued. Interactive jobs (salloc and srun) will be cancelled if the PrologSlurmctld fails.

Information about the job is passed to the script using environment variables. Unless otherwise specified, these environment variables are available to all of the programs.

BASIL_RESERVATION_ID

Basil reservation ID. Available on Cray XT/XE systems only.

MPIRUN_PARTITION

BlueGene partition name. Available on BlueGene systems only.

SLURM_JOB_ACCOUNT

Account name used for the job. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_CONSTRAINTS

Features required to run the job. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_DERIVED_EC

The highest exit code of all of the job steps. Available in EpilogSlurmctld only.

SLURM_JOB_EXIT_CODE

The exit code of the job script (or salloc). Available in EpilogSlurmctld only.

SLURM_JOB_GID

Group ID of the job's owner. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_GROUP

Group name of the job's owner. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_ID

Job ID.

SLURM_JOB_NAME

Name of the job. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_NODELIST

Nodes assigned to job. A SLURM hostlist expression. "scontrol show hostnames" can be used to convert this to a list of individual host names. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_PARTITION

Partition that job runs in. Available in PrologSlurmctld and EpilogSlurmctld only.

SLURM_JOB_UID

User ID of the job's owner.

SLURM_JOB_USER

User name of the job's owner.

NETWORK TOPOLOGY

SLURM is able to optimize job allocations to minimize network contention. Special SLURM logic is used to optimize allocations on systems with a three-dimensional interconnect (BlueGene, Sun Constellation, etc.) and information about configuring those systems are available on web pages available here: <http://slurm.schedmd.com/>. For a hierarchical network, SLURM needs to have detailed information about how nodes are configured on the network switches.

Given network topology information, SLURM allocates all of a job's resources onto a single leaf of the network (if possible) using a best-fit algorithm. Otherwise it will allocate a job's resources onto multiple leaf switches so as to minimize the use of higher-level switches. The TopologyPlugin parameter controls which plugin is used to collect network topology information. The only values presently supported are "topology/3d_torus" (default for IBM BlueGene, Sun Constellation and Cray XT/XE systems, performs best-fit logic over three-dimensional topology), "topology/none" (default for other systems, best-fit logic over one-dimensional topology), "topology/tree" (determine the network topology based upon information contained in a topology.conf file, see "man topology.conf" for more information). Future plugins may gather topology information directly from the network. The topology information is optional. If not provided, SLURM will perform a best-fit algorithm assuming the nodes are in a one-dimensional array as configured and the communications cost is related to the node distance in this array.

RELOCATING CONTROLLERS

If the cluster's computers used for the primary or backup controller will be out of service for an extended period of time, it may be desirable to relocate them. In order to do so, follow this procedure:

1. Stop the SLURM daemons
2. Modify the slurm.conf file appropriately
3. Distribute the updated slurm.conf file to all nodes
4. Restart the SLURM daemons

There should be no loss of any running or pending jobs. Insure that any nodes added to the cluster have the current slurm.conf file installed.

CAUTION: If two nodes are simultaneously configured as the primary controller (two nodes on which ControlMachine specify the local host and the slurmctld daemon is executing on each), system behavior will be destructive. If a compute node has an incorrect ControlMachine or BackupController parameter, that node may be rendered unusable, but no other harm will result.

EXAMPLE

#
# Sample /etc/slurm.conf for dev[0-25].llnl.gov
# Author: John Doe
# Date: 11/06/2001
#
ControlMachine=dev0
ControlAddr=edev0
BackupController=dev1
BackupAddr=edev1
#
AuthType=auth/munge
Epilog=/usr/local/slurm/epilog
Prolog=/usr/local/slurm/prolog
FastSchedule=1
FirstJobId=65536
InactiveLimit=120
JobCompType=jobcomp/filetxt
JobCompLoc=/var/log/slurm/jobcomp
KillWait=30
MaxJobCount=10000
MinJobAge=3600
PluginDir=/usr/local/lib:/usr/local/slurm/lib
ReturnToService=0
SchedulerType=sched/backfill
SlurmctldLogFile=/var/log/slurm/slurmctld.log
SlurmdLogFile=/var/log/slurm/slurmd.log
SlurmctldPort=7002
SlurmdPort=7003
SlurmdSpoolDir=/usr/local/slurm/slurmd.spool
StateSaveLocation=/usr/local/slurm/slurm.state
SwitchType=switch/elan
TmpFS=/tmp
WaitTime=30
JobCredentialPrivateKey=/usr/local/slurm/private.key
JobCredentialPublicCertificate=/usr/local/slurm/public.cert
#
# Node Configurations
#
NodeName=DEFAULT CPUs=2 RealMemory=2000 TmpDisk=64000
NodeName=DEFAULT State=UNKNOWN
NodeName=dev[0-25] NodeAddr=edev[0-25] Weight=16
# Update records for specific DOWN nodes
DownNodes=dev20 State=DOWN Reason="power,ETA=Dec25"
#
# Partition Configurations
#
PartitionName=DEFAULT MaxTime=30 MaxNodes=10 State=UP
PartitionName=debug Nodes=dev[0-8,18-25] Default=YES
PartitionName=batch Nodes=dev[9-17] MinNodes=4
PartitionName=long Nodes=dev[9-17] MaxTime=120 AllowGroups=admin

FILE AND DIRECTORY PERMISSIONS

There are three classes of files: Files used by slurmctld must be accessible by user SlurmUser and accessible by the primary and backup control machines. Files used by slurmd must be accessible by user root and accessible from every compute node. A few files need to be accessible by normal users on all login and compute nodes. While many files and directories are listed below, most of them will not be used with most configurations.

AccountingStorageLoc

If this specifies a file, it must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines. It is recommended that the file be readable by all users from login and compute nodes.

Epilog

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

EpilogSlurmctld

Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines.

HealthCheckProgram

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

JobCheckpointDir

Must be writable by user SlurmUser and no other users. The file must be accessible by the primary and backup control machines.

JobCompLoc

If this specifies a file, it must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

JobCredentialPrivateKey

Must be readable only by user SlurmUser and writable by no other users. The file must be accessible by the primary and backup control machines.

JobCredentialPublicCertificate

Readable to all users on all nodes. Must not be writable by regular users.

MailProg

Must be executable by user SlurmUser. Must not be writable by regular users. The file must be accessible by the primary and backup control machines.

Prolog

Must be executable by user root. It is recommended that the file be readable by all users. The file must exist on every compute node.

PrologSlurmctld

Must be executable by user SlurmUser. It is recommended that the file be readable by all users. The file must be accessible by the primary and backup control machines.

ResumeProgram

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

SallocDefaultCommand

Must be executable by all users. The file must exist on every login and compute node.

slurm.conf

Readable to all users on all nodes. Must not be writable by regular users.

SlurmctldLogFile

Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

SlurmctldPidFile

Must be writable by user root. Preferably writable and removable by SlurmUser. The file must be accessible by the primary and backup control machines.

SlurmdLogFile

Must be writable by user root. A distinct file must exist on each compute node.

SlurmdPidFile

Must be writable by user root. A distinct file must exist on each compute node.

SlurmdSpoolDir

Must be writable by user root. A distinct file must exist on each compute node.

SrunEpilog

Must be executable by all users. The file must exist on every login and compute node.

SrunProlog

Must be executable by all users. The file must exist on every login and compute node.

StateSaveLocation

Must be writable by user SlurmUser. The file must be accessible by the primary and backup control machines.

SuspendProgram

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

TaskEpilog

Must be executable by all users. The file must exist on every compute node.

TaskProlog

Must be executable by all users. The file must exist on every compute node.

UnkillableStepProgram

Must be executable by user SlurmUser. The file must be accessible by the primary and backup control machines.

LOGGING

Note that while SLURM daemons create log files and other files as needed, it treats the lack of parent directories as a fatal error. This prevents the daemons from running if critical file systems are not mounted and will minimize the risk of cold-starting (starting without preserving jobs).

Log files and job accounting files, may need to be created/owned by the "SlurmUser" uid to be successfully accessed. Use the "chown" and "chmod" commands to set the ownership and permissions appropriately. See the section FILE AND DIRECTORY PERMISSIONS for information about the various files and directories used by SLURM.

It is recommended that the logrotate utility be used to insure that various log files do not become too large. This also applies to text files used for accounting, process tracking, and the slurmdbd log if they are used.

Here is a sample logrotate configuration. Make appropriate site modifications and save as /etc/logrotate.d/slurm on all nodes. See the logrotate man page for more details.

##
# SLURM Logrotate Configuration
##
/var/log/slurm/*log {

    compress

    missingok

    nocopytruncate

    nocreate

    nodelaycompress

    nomail

    notifempty

    noolddir

    rotate 5

    sharedscripts

    size=5M

    create 640 slurm root

    postrotate
       /etc/init.d/slurm reconfig


    endscript
}

COPYING

Copyright (C) 2002-2007 The Regents of the University of California. Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
Copyright (C) 2008-2010 Lawrence Livermore National Security.
Copyright (C) 2010-2013 SchedMD LLC.

This file is part of SLURM, a resource management program. For details, see <http://slurm.schedmd.com/>.

SLURM is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

SLURM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

FILES

/etc/slurm.conf

SEE ALSO

bluegene.conf(5), cgroup.conf(5), gethostbyname (3), getrlimit (2), gres.conf(5), group (5), hostname (1), scontrol(1), slurmctld(8), slurmd(8), slurmdbd(8), slurmdbd.conf(5), srun(1), spank(8), syslog (2), topology.conf(5), wiki.conf(5)

---