# Slurm Version 20.11 Configuration Tool - Easy Version

This form can be used to create a Slurm configuration file with you controlling many of the important configuration parameters.

This is a simplified version of the Slurm configuration tool. This version has fewer options for creating a Slurm configuration file. The full version of the Slurm configuration tool is available at configurator.html.

This tool supports Slurm version 20.11 only. Configuration files for other versions of Slurm should be built using the tool distributed with it in doc/html/configurator.html. Some parameters will be set to default values, but you can manually edit the resulting slurm.conf as desired for greater flexibility. See man slurm.conf for more details about the configuration parameters.

Note the 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).

Note that this configuration file must be installed on all nodes in your cluster.

After you have filled in the fields of interest, use the "Submit" button on the bottom of the page to build the slurm.conf file. It will appear on your web browser. Save the file in text format as slurm.conf for use by Slurm.

For more information about Slurm, see https://slurm.schedmd.com/slurm.html

## Control Machines

Define the hostname of the computer on which the Slurm controller and optional backup controller will execute. Hostname values should should not be the fully qualified domain name (e.g. use tux rather than tux.abc.com).

SlurmctldHost: Primary Controller Hostname

## Compute Machines

Define the machines on which user applications can run. You can also specify addresses of these computers if desired (defaults to their hostnames). Only a few of the possible parameters associated with the nodes will be set by this tool, but many others are available. Executing the command slurmd -C on each compute node will print its physical configuration (sockets, cores, real memory size, etc.), which can be used in constructing the slurm.conf file. All of the nodes will be placed into a single partition (or queue) with global access. Many options are available to group nodes into partitions with a wide variety of configuration parameters. Manually edit the slurm.conf produced to exercise these options. Node names and addresses may be specified using a numeric range specification.

NodeName: Compute nodes

NodeAddr: Compute node addresses (optional)

PartitionName: Name of the one partition to be created

MaxTime: Maximum time limit of jobs in minutes or INFINITE

The following parameters describe a node's configuration. Set a value for CPUs. The other parameters are optional, but provide more control over scheduled resources:

CPUs: Count of processors on each compute node. If CPUs is omitted, it will be inferred from: Sockets, CoresPerSocket, and ThreadsPerCore.

Sockets: Number of physical processor sockets/chips on the node. If Sockets is omitted, it will be inferred from: CPUs, CoresPerSocket, and ThreadsPerCore.

CoresPerSocket: Number of cores in a single physical processor socket. The CoresPerSocket value describes physical cores, not the logical number of processors per socket.

ThreadsPerCore: Number of logical threads in a single physical core.

RealMemory: Amount of real memory. This parameter is required when specifying Memory as a consumable resource with the select/cons_res plug-in. See below under Resource Selection.

## Slurm User

The Slurm controller (slurmctld) can run without elevated privileges, so it is recommended that a user "slurm" be created for it. For testing purposes any user name can be used.

SlurmUser

## State Preservation

Define the location of a directory where the slurmctld daemon saves its state. This should be a fully qualified pathname which can be read and written to by the Slurm user on both the control machine and backup controller (if configured). The location of a directory where slurmd saves state should also be defined. This must be a unique directory on each compute server (local disk). The use of a highly reliable file system (e.g. RAID) is recommended.

StateSaveLocation: Slurmctld state save directory

SlurmdSpoolDir: Slurmd state save directory

Define when a non-responding (DOWN) node is returned to service.
Select one value for ReturnToService:
0: When explicitly restored to service by an administrator.
1:Upon registration with a valid configuration only if it was set DOWN due to being non-responsive.
2:Upon registration with a valid configuration.

## Scheduling

Define the mechanism to be used for controlling job ordering.
Select one value for SchedulerType:
Backfill: FIFO with backfill
Builtin: First-In First-Out (FIFO)

## Interconnect

Define the node interconnect used.
Select one value for SwitchType:
Cray XC: Cray XC proprietary interconnect
None: No special handling required (InfiniBand, Myrinet, Ethernet, etc.)

## Default MPI Type

Specify the type of MPI to be used by default. Slurm will configure environment variables accordingly. Users can over-ride this specification with an srun option.
Select one value for MpiDefault:
MPI-PMI2 (For PMI2-supporting MPI implementations)
MPI-PMIx (Exascale PMI implementation)
None: This works for most other MPI types.

## Process Tracking

Define the algorithm used to identify which processes are associated with a given job. This is used signal, kill, and account for the processes associated with a job step.
Select one value for ProctrackType:
Cgroup: Use Linux cgroup to create a job container and track processes. Build a cgroup.conf file as well
Cray XC: Cray XC proprietary process tracking
LinuxProc: Use parent process ID records, processes can escape from Slurm control
Pgid: Use Unix Process Group ID, processes changing their process group ID can escape from Slurm control

## Resource Selection

Define resource (node) selection algorithm to be used.
Select one value for SelectType:
cons_tres: Allocate individual processors, memory, GPUs, and other trackable resources
Cons_res: Allocate individual processors and memory
Cray XC: Cray XC systems running native Slurm without ALPS
Linear: Node-base resource allocation, does not manage individual processor allocation

SelectTypeParameters (Not supported by SelectType=select/linear):
  Note: The -E extension for sockets, cores, and threads are ignored within the node allocation mechanism when CR_CPU or CR_CPU_MEMORY is selected. They are considered to compute the total number of tasks when -n is not specified
  Note: CR_MEMORY assumes MaxShare value of one of higher
CR_CPU: CPUs as consumable resources.
  No notion of sockets, cores, or threads. On a multi-core system, cores will be considered CPUs. On a multi-core/hyperthread system, threads will be considered CPUs. On a single-core systems CPUs are CPUs. ;-)
CR_Socket: Sockets as a consumable resource.
CR_Core: (default) Cores as a consumable resource.
CR_Memory: Memory as a consumable resource.
  Note: CR_Memory assumes MaxShare value of one of higher
CR_CPU_Memory: CPU and Memory as consumable resources.
CR_Socket_Memory: Socket and Memory as consumable resources.
CR_Core_Memory: Core and Memory as consumable resources.

## Task Launch

Define a task launch plugin. This may be used to provide resource management within a node (e.g. pinning tasks to specific processors). Select one value for TaskPlugin:
Cray XC: Cray XC proprietary task launch
None: No task launch actions
Affinity: CPU affinity support (see srun man pages for the --cpu-bind, --mem-bind, and -E options)
Cgroup: Allocated resources constraints enforcement using Linux Control Groups (see cgroup.conf man page)

## Event Logging

Slurmctld and slurmd daemons can each be configured with different levels of logging verbosity from 0 (quiet) to 7 (extremely verbose). Each may also be configured to use debug files. Use fully qualified pathnames for the files.

SlurmctldLogFile (default is none, log goes to syslog)

SlurmdLogFile (default is none, log goes to syslog, string "%h" in name gets replaced with hostname)

## Job Accounting Gather

Slurm accounts for resource use per job. System specifics can be polled determined by system type
Select one value for JobAcctGatherType:
None: No job accounting
cgroup: Specifc Linux cgroup information gathered, use with Linux systems only
Linux: Specifc Linux process table information gathered, use with Linux systems only

## Job Accounting Storage

Used with the Job Accounting Gather Slurm can store the accounting information in many different fashions. Fill in your systems choice here
Select one value for AccountingStorageType:
None: No job accounting storage
SlurmDBD: Write job accounting to Slurm DBD (database daemon) which can securely save the data from many Slurm managed clusters into a common database

Options below are for use with a database to specify where the database is running and how to connect to it
ClusterName: Name to be recorded in database for jobs from this cluster. This is important if a single database is used to record information from multiple Slurm-managed clusters.

## Process ID Logging

Define the location into which we can record the daemon's process ID. This is used for locate the appropriate daemon for signaling. Specify a specify the fully qualified pathname for the file.

SlurmctldPidFile

SlurmdPidFile

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Last modified 10 April 2018