Hi
I think you want one of the "MaxTRESMins*" options:
MaxTRESMins=TRES=<minutes>[,TRES=<minutes>,...] MaxTRESMinsPJ=TRES=<minutes>[,TRES=<minutes>,...] MaxTRESMinsPerJob=TRES=<minutes>[,TRES=<minutes>,...] Maximum number of TRES minutes each job is able to use in this association. This is overridden if set directly on a user. Default is the cluster's limit. To clear a previously set value use the modify command with a new value of -1 for each TRES id.
- sacctmgr(1)
The "MaxCPUs" is a limit on the number of CPUs the association can use.
-- Michael
On Fri, Apr 18, 2025 at 8:01 AM Patrick Begou via slurm-users < slurm-users@lists.schedmd.com> wrote:
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:
- create the QoS:
sudo sacctmgr add qos workflowlimit \ MaxWallDurationPerJob=48:00:00 \ MaxCPUsPerJob=172800 \ Flags=DenyOnLimit,OverPartQOS
- Check
sacctmgr show qos Name=workflowlimit format=Name%16,MaxTRES,MaxWall Name MaxTRES MaxWall ---------------- ------------- ----------- workflowlimit cpu=172800 2-00:00:00
- Set the QoS for the account "most" which is the default account for
the users: sudo sacctmgr modify account name=most set qos=workflowlimit
- 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
- Modifiy slurm.conf with: AccountingStorageEnforce=limits,qos
and propagate on the 5 nodes and the front end (done via Ansible)
- 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
- 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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