[slurm-users] Scheduler does not reserve resources

Rodrigo Santibáñez rsantibanez.uchile at gmail.com
Wed Jan 12 16:26:58 UTC 2022

Hi Jeremy,

I had a similar behavior a long time ago, and I decided to set
SchedulerType=sched/builtin to empty X nodes of jobs and execute that
high-priority job requesting more than one node. It is not ideal, but the
cluster has low load, so a user that requests more than one node doesn't
delay too much the execution of other's jobs.

Hope others can help you with a better idea than mine.


On Wed, Jan 12, 2022 at 1:01 PM Jérémy Lapierre <
jeremy.lapierre at uni-saarland.de> wrote:

> Hi To all slurm users,
> We have the following issue: jobs with highest priority are pending
> forever with "Resources" reason. More specifically, the jobs pending
> forever ask for 2 full nodes but all other jobs from other users
> (running or pending) need only a 1/4 of a node, then pending jobs asking
> for 1/4 of a node always get allocated and the jobs asking for 2 nodes
> are pending forever even though the priority is higher than the ones
> asking for less resources. I hope I'm clear enough, if not please look
> at page 17 on https://slurm.schedmd.com/SUG14/sched_tutorial.pdf, in our
> situation an infinite number of jobs will fit before what is job4 in the
> scheme p. 17 and thus job4 will never be launched. Here are our
> Scheduler options:
> FastSchedule            = 0
> SchedulerParameters     =
> bf_max_job_test=500,max_job_bf=100,bf_interval=60,bf_continue
> SchedulerTimeSlice      = 60 sec
> SchedulerType           = sched/backfill
> SlurmSchedLogFile       = (null)
> SlurmSchedLogLevel      = 0
> Thanks for your help,
> Best regards,
> Jeremy
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