topology.conf(5)

NAME
topology.conf - Slurm configuration file for defining the network topology

PREREQUISITES

Topology.conf can only represent a hierarchical network. All nodes in the network must be connected to at least one switch. The network must be fully connected to use a RoutePlugin. Jobs can only span nodes connected by the same switch fabric, even if there are available idle nodes.

DESCRIPTION
topology.conf is an ASCII file which describes the cluster's network topology for optimized job resource allocation. 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 slurm.conf file.

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.

The network topology configuration one line defining a switch name and its children, either node names or switch names. Slurm's hostlist expression parser is used, so the node and switch names need not be consecutive (e.g. "Nodes=tux[0-3,12,18-20]" and "Switches=s[0-2,4-8,12]" will parse fine). An optional link speed may also be specified.

The topology.conf file for an Infiniband switch can be automatically generated using the slurmibtopology tool found here: <https://ftp.fysik.dtu.dk/Slurm/slurmibtopology.sh>.

The overall configuration parameters available include:

SwitchName
    The name of a switch. This name is internal to Slurm and arbitrary. Each switch should have a unique name. This field must be specified.

Switches
    Child switches of the named switch. Either this option or the Nodes option must be specified.

Nodes
    Child Nodes of the named leaf switch. Either this option or the Switches option must be specified.

LinkSpeed
    An optional value specifying the performance of this communication link. The units used are arbitrary and this information is currently not used. It may be used in the future to optimize resource allocations.

EXAMPLE
##################################################################
# Slurm's network topology configuration file for use with the
# topology/tree plugin
##################################################################
SwitchName=s0 Nodes=dev[0-5]
SwitchName=s1 Nodes=dev[6-11]
SwitchName=s2 Nodes=dev[12-17]
SwitchName=s3 Switches=s[0-2]

COPYING
Copyright (C) 2009 Lawrence Livermore National Security. Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
Copyright (C) 2010-2021 SchedMD LLC.

This file is part of Slurm, a resource management program. For details, see <https://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.

SEE ALSO

slurm.conf(5)