[slurm-users] backfill on overlapping partitions problem

[Andrej Filipcic]

Hi,

We have a strange problem with backfilling, there are
large partition "cpu" and overlapping partition "largemem" which is a 
subset of "cpu" nodes.

Now, user A is submitting low priority jobs to "cpu", user B high 
priority jobs to "largemem"
If there are queued jobs in "largemem" (draining nodes there), the 
slurmctld would never backfill the "cpu".  At the extreme, 
non-overlapping "cpu" nodes  would get empty until higher prio jobs get 
all running in "largemem"

Any hint or workaround here? backfill works quite fine if all the jobs 
are submitted to "cpu" partition. User A has typically smaller and 
shorter jobs, good for backfilling.

we use these settings with slurm:
PriorityType=priority/multifactor
SchedulerType=sched/backfill
SelectType=select/cons_tres
SelectTypeParameters=CR_CORE_MEMORY,CR_CORE_DEFAULT_DIST_BLOCK
SchedulerParameters     = 
bf_max_job_test=2000,bf_window=1440,default_queue_depth=1000,bf_continue

Best regards,
Andrej

-- 
_____________________________________________________________
    prof. dr. Andrej Filipcic,   E-mail: Andrej.Filipcic at ijs.si
    Department of Experimental High Energy Physics - F9
    Jozef Stefan Institute, Jamova 39, P.o.Box 3000
    SI-1001 Ljubljana, Slovenia
    Tel.: +386-1-477-3674    Fax: +386-1-425-7074
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