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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