[slurm-users] Scheduler does not reserve resources

Jérémy Lapierre jeremy.lapierre at uni-saarland.de
Wed Jan 12 15:59:41 UTC 2022

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     = 
SchedulerTimeSlice      = 60 sec
SchedulerType           = sched/backfill
SlurmSchedLogFile       = (null)
SlurmSchedLogLevel      = 0

Thanks for your help,
Best regards,

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