Hi all,
I'm trying to setup a QoS on a small 5 nodes cluster running slurm
24.05.7. My goal is to limit the resources on a (time x number of cores)
strategy to avoid one large job requesting all the resources for too
long time. I've read from https://slurm.schedmd.com/qos.html and some
discussion but my setup is still not working.
I think I need to set these informations:
MaxCPUsPerJob=172800
MaxWallDurationPerJob=48:00:00
Flags=DenyOnLimit,OverPartQOS
for:
12h max for 240 cores => (12*240*60=172800mn)
no job can exceed 2 days
do not accept jobs out of these limits.
What I've done:
1) create the QoS:
sudo sacctmgr add qos workflowlimit \
MaxWallDurationPerJob=48:00:00 \
MaxCPUsPerJob=172800 \
Flags=DenyOnLimit,OverPartQOS
2) Check
sacctmgr show qos Name=workflowlimit format=Name%16,MaxTRES,MaxWall
Name MaxTRES MaxWall
---------------- ------------- -----------
workflowlimit cpu=172800 2-00:00:00
3) Set the QoS for the account "most" which is the default account for
the users:
sudo sacctmgr modify account name=most set qos=workflowlimit
4) Check
$ sacctmgr show assoc format=account,cluster,user,qos
Account Cluster User QOS
---------- ---------- ---------- --------------------
root osorno normal
root osorno root normal
legi osorno normal
most osorno workflowlimit
most osorno begou workflowlimit
5) Modifiy slurm.conf with:
AccountingStorageEnforce=limits,qos
and propagate on the 5 nodes and the front end (done via Ansible)
6) Check
clush -b -w osorno-fe,osorno,osorno-0-[0-4] 'grep
AccountingStorageEnforce /etc/slurm/slurm.conf'
---------------
osorno,osorno-0-[0-4],osorno-fe (7)
---------------
AccountingStorageEnforce=limits,qos
7) restart slurmd on all the compute nodes and slurmctld + slurmdbd on
the management node.
But I can still request 400 cores for 24 hours:
[begou@osorno ~]$ srun -n 400 -t 24:0:0 --pty bash
bash-5.1$ squeue
JOBID PARTITION NAME USER ST TIME
START_TIME TIME_LIMIT CPUS NODELIST(REASON)
147 genoa bash begou R 0:03
2025-04-18T16:52:11 1-00:00:00 400 osorno-0-[0-4]
So I must have missed something ?
My partition (I've only one) in slurm.conf is:
PartitionName=genoa State=UP Default=YES MaxTime=48:00:00
DefaultTime=24:00:00 Shared=YES OverSubscribe=NO Nodes=osorno-0-[0-4]
Thanks
Patrick
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