PERSONAL/NONWORK // EXTERNAL
I took a look through the archives, and I did not see an clear answer to the
issue I was seeing, so I thought I would go ahead and ask.
I am having a cluster issue with SLURM and I hoped you might be able to help me
out. I built a small test cluster to determine if it might meet some compute
needs I have but seem to keep running into an issue where SLURM is restricting
MATLAB to using a single CPU regardless of how many we request.
During testing I found the following:
When I login into a MATLAB interactive session and run "feature numcores"
I get the following:
[cid:image002.jpg@01D48D35.180C4F30]
Which is correct, as I have 14 cores and they are all available.
However when I go into SLURM and request a MATLAB interactive session and run
the same command on the same computer:
[cid:image004.png@01D48D35.180C4F30]
So, what I understand is that my cgroups settings in SLURM are restricting
MATLAB to a single core. Is that correct? Also, how do I fix this?
Here is my cgroups.conf
###
#
# Slurm cgroup support configuration file
#
# See man slurm.conf and man cgroup.conf for further
# information on cgroup configuration parameters
#--
########################################################
# W A R N I N G: This file is managed by Puppet #
# - - - - - - - changes are likely to be overwritten #
########################################################
#######################
CgroupAutomount=yes
#######################
# testing -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
#ConstrainCores=no
#ConstrainRAMSpace=no
#ConstrainSwapSpace=no
# testing -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
ConstrainCores=yes
ConstrainRAMSpace=yes
ConstrainSwapSpace=yes
#
ConstrainDevices=no
AllowedSwapSpace=0
MaxRAMPercent=100
MaxSwapPercent=100
##MinRAMSpace=30
# TASK/CGROUP PLUGIN
# Constrain the job cgroup RAM to this percentage of the allocated memory.
#AllowedRAMSpace=10
AllowedRamSpace=100
# TaskAffinity=<yes|no>
# If configured to "yes" then set a default task affinity to bind each
# step task to a subset of the allocated cores using
# sched_setaffinity. The default value is "no". Note: This feature
# requires the Portable Hardware Locality (hwloc) library to be
# installed.
TaskAffinity=yes
# MemorySwappiness=<number>
# Configure the kernel's priority for swapping out anonymous pages (such as
program data)
# verses file cache pages for the job cgroup. Valid values are between 0 and
100, inclusive. A
# value of 0 prevents the kernel from swapping out program data. A value of 100
gives equal
# priorioty to swapping out file cache or anonymous pages. If not set, then the
kernel's default
# swappiness value will be used. Either ConstrainRAMSpace or ConstrainSwapSpace
must
# be set to yes in order for this parameter to be applied.
MemorySwappiness=0
#####################################################################################
# If compute nodes mount Lustre or NFS file systems, it may be a good idea to
#
# configure cgroup.conf with:
#
# ConstrainKmemSpace=no
#
#
#
# From
<https://wiki.fysik.dtu.dk/niflheim/Slurm_configuration#activating-cgroups> #
#####################################################################################
ConstrainKmemSpace=no
#
########################################################
# W A R N I N G: This file is managed by Puppet #
# - - - - - - - changes are likely to be overwritten #
########################################################
Thanks,
Wes
(A slurm neophyte)
