[slurm-users] PreemptExemptTime

Groner, Rob rug262 at psu.edu
Tue Mar 7 14:46:57 UTC 2023

I found a thread about this topic that's a year old and at that time seemed to give no hope, I'm just wondering if the situation has changed.  My testing so far isn't encouraging.

In the thread (here: https://groups.google.com/g/slurm-users/c/yhnSVBoohik) it talks about wanting to give lower priority jobs some amount of guaranteed run time.  That's what we're trying to do.

Over global settings are PreemptMode=SUSPEND,GANG and PreemptType=preempt/partition_prio.  We have a high priority partition that nothing should ever preempt, and an open partition that is always preemptable.  In between is a burst partition.  It can be preempted if the high priority partition needs the resources.  That's the partition we'd like to guarantee a 1 hour run time on.  Looking at the sacctmgr man page, it gives this info on QOS:

              Specifies a minimum run time for jobs of this QOS before they are considered for preemption. This QOS option takes precedence over the global PreemptExemptTime. This  is  only honored for PreemptMode=REQUEUE and PreemptMode=CANCEL.

This sounds like exactly what we want.  So I went into the burst QOS we have available on the burst partition and I set a preemptExemptTime of 30 seconds and a preemptMode of cancel, and tested.  Whenever something of a higher priority came along, my job was immediately cancelled, no exempt time was utliized.

Am I not understanding how this is supposed to work, or am I asking for an impossible slurm configuration?



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