Your bf_window may be too small. From 'man slurm.conf':
bf_window=#
The number of minutes into the future to look when considering jobs to schedule. Higher values result in more overhead and less responsiveness. A value at least as long as the highest allowed time limit is generally advisable to prevent job starvation. In order to limit the amount of data managed by the backfill scheduler, if the value of bf_window is increased, then it is generally advisable to also increase bf_resolution. This option applies only to SchedulerType=sched/backfill. Default: 1440 (1 day), Min: 1, Max: 43200 (30 days).
So since we have a 5 day option should bf_window=7200? What should bf_resolution be set to then?
But how does this affect/improve wait times?
On Tue, Jun 4, 2024 at 4:13 PM Ryan Novosielski novosirj@rutgers.edu
wrote:
This is relatively true of my system as well, and I believe it’s that
the backfill schedule is slower than the main scheduler.
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`'On Jun 4, 2024, at 16:03, Robert Kudyba via slurm-users <
slurm-users@lists.schedmd.com> wrote:
At the moment we have 2 nodes that are having long wait times.
Generally this is when the nodes are fully allocated. What would be the other
reasons if there is still enough available memory and CPU available,
that a job would take so long? Slurm version is 23.02.4 via Bright
Computing. Note the compute nodes have hyperthreading enabled but that
should be irrelevant. Is there a way to determine what else could
be holding jobs up?
srun --pty -t 0-01:00:00 --nodelist=node001 --gres=gpu:1 -A ourts -p
short /bin/bash
srun: job 672204 queued and waiting for resources
scontrol show node node001 NodeName=m001 Arch=x86_64 CoresPerSocket=48 CPUAlloc=24 CPUEfctv=192 CPUTot=192 CPULoad=20.37 AvailableFeatures=location=local ActiveFeatures=location=local Gres=gpu:A6000:8 NodeAddr=node001 NodeHostName=node001 Version=23.02.4 OS=Linux 5.14.0-70.13.1.el9_0.x86_64 #1 SMP PREEMPT Thu Apr 14
12:42:38 EDT 2022
RealMemory=1031883 AllocMem=1028096 FreeMem=222528 Sockets=2 Boards=1 State=MIXED ThreadsPerCore=2 TmpDisk=0 Weight=1 Owner=N/AMCS_label=N/A
Partitions=ours,short BootTime=2024-04-29T16:18:30 SlurmdStartTime=2024-05-18T16:48:11 LastBusyTime=2024-06-03T10:49:49 ResumeAfterTime=None CfgTRES=cpu=192,mem=1031883M,billing=192,gres/gpu=8 AllocTRES=cpu=24,mem=1004G,gres/gpu=2,gres/gpu:a6000=2 CapWatts=n/a CurrentWatts=0 AveWatts=0 ExtSensorsJoules=n/s ExtSensorsWatts=0 ExtSensorsTemp=n/sgrep 672204 /var/log/slurmctld [2024-06-04T15:50:35.627] sched: _slurm_rpc_allocate_resources
JobId=672204 NodeList=(null) usec=852
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