[slurm-users] Excessive use of backfill on a cluster

[Baker D.J.]

Hello,


We are running Slurm 18.08.0 on our cluster and I am concerned that Slurm appears to be using backfill scheduling excessively. In fact the vast majority of jobs are being scheduled using backfill. So, for example, I have just submitted a set of three serial jobs. They all started on a compute node that was completely free, but disconcertingly in the slurmctl log they were all reported as started using backfill and that isn't making sense...


[2018-11-20T12:31:27.598] backfill: Started JobId=217031 in batch on red158
[2018-11-20T12:32:28.004] backfill: Started JobId=217032 in batch on red158
[2018-11-20T12:33:58.608] backfill: Started JobId=217033 in batch on red158


I either don't understand the context of backfill re slurm or the above is odd. Has anyone seem this "overuse" (unnecessary) use of backfill on their cluster and/or could offer advice, please.


Best regards,

David

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