    of Generic RESource (GRES) on each compute node.
    If the GRES information in the slurm.conf file does not fully describe those
    resources, then a gres.conf file should be included on each compute node.
    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 file will always be located in the
    same directory as the \fBslurm.conf\fP file.

    .LP
    If the GRES information in the slurm.conf file fully describes those resources
    (i.e. no "Cores", "File" or "Links" specification is required for that GRES
    type or that information is automatically detected), that information may be
    omitted from the gres.conf file and only the configuration information in the
    slurm.conf file will be used.
    The gres.conf file may be omitted completely if the configuration information
    in the slurm.conf file fully describes all GRES.

    .LP
    If using the \fBgres.conf\fR file to describe the resources available to nodes,
    the first parameter on the line should be \fBNodeName\fR. If configuring
    Generic Resources without specifying nodes, the first parameter on the line
    should be \fBName\fR.

    .LP
    Parameter names are case insensitive.
    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.

    .LP
    \fBNOTE:\fP Slurm support for gres/mps requires the use of the select/cons_tres
    plugin. For more information on how to configure MPS, see
    \fIhttps://slurm.schedmd.com/gres.html#MPS_Management\fR.

    .LP
    For more information on GRES scheduling in general, see
    \fIhttps://slurm.schedmd.com/gres.html\fR.

    .LP
    The overall configuration parameters available include:

    .TP
    \fBAutoDetect\fR
    The hardware detection mechanisms to enable for automatic GRES configuration.
    Currently, the options are:
    .RS
    .TP
    \fBnvml\fR
    Automatically detect NVIDIA GPUs
    .TP
    to "off" in a node-specific GRES line.
    E.g.: \fINodeName=tux3 AutoDetect=off Name=gpu File=/dev/nvidia[0\-3]\fR.

    .TP
    \fBCount\fR
    Number of resources of this type available on this node.
    The default value is set to the number of \fBFile\fR values specified (if any),
    otherwise the default value is one. A suffix of "K", "M", "G", "T" or "P" may be
    used to multiply the number by 1024, 1048576, 1073741824, etc. respectively.
    For example: "Count=10G".

    .TP
    \fBCores\fR
    Optionally specify the core index numbers for the specific cores
    which can use this resource.
    For example, it may be strongly preferable to use specific cores with specific
    GRES devices (e.g. on a NUMA architecture).
    While Slurm can track and assign resources at the CPU or thread level, its
    scheduling algorithms used to co\-allocate GRES devices with CPUs operates at a
    socket or NUMA level.
    Therefore it is not possible to preferentially assign GRES with different
    specific CPUs on the same NUMA or socket and this option should be used to
    identify all cores on some socket.

    Multiple cores may be specified using a comma delimited list or a range may be
    specified using a "\-" separator (e.g. "0,1,2,3" or "0\-3").
    If a job specifies \fB\-\-gres\-flags=enforce\-binding\fR, then only the
    identified cores can be allocated with each generic resource. This will tend to
    improve performance of jobs, but delay the allocation of resources to them.
    If specified and a job is \fInot\fR submitted with the
    \fB\-\-gres\-flags=enforce\-binding\fR option the identified cores will be
    preferred for scheduling with each generic resource.

    If \fB\-\-gres\-flags=disable\-binding\fR is specified, then any core can be
    used with the resources, which also increases the speed of Slurm's
    scheduling algorithm but can degrade the application performance.
    The \fB\-\-gres\-flags=disable\-binding\fR option is currently required to use
    more CPUs than are bound to a GRES (i.e. if a GPU is bound to the CPUs on one
    socket, but resources on more than one socket are required to run the job).
    If any core can be effectively used with the resources, then do not specify the
    \fBcores\fR option for improved speed in the Slurm scheduling logic.
    A restart of the slurmctld is needed for changes to the Cores option to take
    effect.

    \fBNOTE:\fR Since Slurm must be able to perform resource management on
    heterogeneous clusters having various processing unit numbering schemes,
    a logical core index must be specified instead of the physical core index.
    That logical core index might not correspond to your physical core index number.
    Core 0 will be the first core on the first socket, while core 1 will be the
    second core on the first socket.
    This numbering coincides with the logical core number (Core L#) seen
    the job's cgroup and prevent use of other files.
    Please see Slurm's Cgroups Guide for more
    information: \fIhttps://slurm.schedmd.com/cgroups.html\fR.

    If \fBFile\fR is specified then \fBCount\fR must be either set to the number
    of file names specified or not set (the default value is the number of files
    specified).
    The exception to this is MPS. For MPS, each GPU would be identified by device
    file using the \fBFile\fR parameter and \fBCount\fR would specify the number of
    MPS entries that would correspond to that GPU (typically 100 or some multiple of
    100).

    NOTE: If you specify the \fBFile\fR parameter for a resource on some node,
    the option must be specified on all nodes and Slurm will track the assignment
    of each specific resource on each node. Otherwise Slurm will only track a
    count of allocated resources rather than the state of each individual device
    file.

    NOTE: Drain a node before changing the count of records with \fBFile\fR
    parameters (i.e. if you want to add or remove GPUs from a node's configuration).
    Failure to do so will result in any job using those GRES being aborted.

    .TP
    \fBFlags\fR
    Optional flags that can be specified to change configured behavior of the GRES.

    Allowed values at present are:
    .RS
    .TP 20
    \fBCountOnly\fR
    Do not attempt to load plugin as this GRES will only be used to track counts of
    GRES used. This avoids attempting to load non-existent plugin which can
    affect filesystems with high latency metadata operations for non-existent files.
    .RE

    .TP
    \fBLinks\fR
    A comma\-delimited list of numbers identifying the number of connections
    between this device and other devices to allow coscheduling of
    better connected devices.
    This is an ordered list in which the number of connections this specific
    device has to device number 0 would be in the first position, the number of
    connections it has to device number 1 in the second position, etc.
    A \-1 indicates the device itself and a 0 indicates no connection.
    If specified, then this line can only contain a single GRES device (i.e. can
    only contain a single file via \fBFile\fR).

    This is an optional value and is usually automatically determined if
    \fBAutoDetect\fR is enabled.
    A typical use case would be to identify GPUs having NVLink connectivity.
    Note that for GPUs, the minor number assigned by the OS and used in the device
    \fBgpu\fR
    Graphics Processing Unit
    .TP
    \fBmps\fR
    CUDA Multi\-Process Service (MPS)
    .TP
    \fBnic\fR
    Network Interface Card
    .TP
    \fBmic\fR
    Intel Many Integrated Core (MIC) processor
    .RE

    .TP
    \fBNodeName\fR
    An optional NodeName specification can be used to permit one gres.conf file to
    be used for all compute nodes in a cluster by specifying the node(s) that each
    line should apply to.
    The NodeName specification can use a Slurm hostlist specification as shown in
    the example below.

    .TP
    \fBType\fR
    An optional arbitrary string identifying the type of device.
    For example, this might be used to identify a specific model of GPU, which users
    can then specify in a job request.
    If \fBType\fR is specified, then \fBCount\fR is limited in size (currently 1024).
    A restart of the \fBslurmctld\fR and \fBslurmd\fR daemons is required for changes
    to the \fBType\fR option to take effect.

    .SH "EXAMPLES"
    .LP
    .br
    ##################################################################
    .br
    # Slurm's Generic Resource (GRES) configuration file
    .br
    # Define GPU devices with MPS support, with AutoDetect sanity checking
    .br
    ##################################################################
    .br
    AutoDetect=nvml
    .br
    Name=gpu Type=gtx560 File=/dev/nvidia0 COREs=0,1
    .br
    Name=gpu Type=tesla  File=/dev/nvidia1 COREs=2,3
    .br
    Name=mps Count=100 File=/dev/nvidia0 COREs=0,1
    .br
    Name=mps Count=100  File=/dev/nvidia1 COREs=2,3

    .LP
    .br
    Name=gpu Type=tesla  File=/dev/nvidia3 COREs=2,3
    .br

    .LP
    .br
    ##################################################################
    .br
    # Slurm's Generic Resource (GRES) configuration file
    .br
    # Use a single gres.conf file for all compute nodes \- positive method
    .br
    ##################################################################
    .br
    ## Explicitly specify devices on nodes tux0\-tux15
    .br
    # NodeName=tux[0\-15]  Name=gpu File=/dev/nvidia[0\-3]
    .br
    # NOTE: tux3 nvidia1 device is out of service
    .br
    NodeName=tux[0\-2]  Name=gpu File=/dev/nvidia[0\-3]
    .br
    NodeName=tux3  Name=gpu File=/dev/nvidia[0,2\-3]
    .br
    NodeName=tux[4\-15]  Name=gpu File=/dev/nvidia[0\-3]
    .br

    .LP
    .br
    ##################################################################
    .br
    # Slurm's Generic Resource (GRES) configuration file
    .br
    # Use NVML to gather GPU configuration information
    .br
    # for all nodes except one
    .br
    ##################################################################
    .br
    AutoDetect=nvml
    .br
    NodeName=tux3 AutoDetect=off Name=gpu File=/dev/nvidia[0\-3]
    .br

    ##################################################################
    .br
    # Slurm's Generic Resource (GRES) configuration file
    .br
    # Specify some nodes with NVML, some with RSMI, and some with no AutoDetect
    .br
    ##################################################################
    .br
    .br
    # resource use on these nodes for workflow purposes
    .br
    ##################################################################
    .br
    NodeName=tux[0\-7] Name=bandwidth Type=lustre Count=4G Flags=CountOnly
    .br

    .SH "COPYING"
    Copyright (C) 2010 The Regents of the University of California.
    Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
    .br
    Copyright (C) 2010\-2019 SchedMD LLC.
    .LP
    This file is part of Slurm, a resource management program.
    For details, see <https://slurm.schedmd.com/>.
    .LP
    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.
    .LP
    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.

    .SH "SEE ALSO"
    .LP
    \fBslurm.conf\fR(5)