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Greetings, fellow general university resource administrator.
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<div>Couple things come to mind from my experience:</div>
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<div>1) does your serial partition share nodes with the other non-serial partitions?</div>
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<div>2) what’s your maximum job time allowed, for serial (if the previous answer was “yes”) and non-serial partitions? Are your users submitting particularly longer jobs compared to earlier?<br>
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3) are you using the backfill scheduler at all?</div>
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<div><span style="background-color: rgba(255, 255, 255, 0);">--</span></div>
<span style="background-color: rgba(255, 255, 255, 0);">Mike Renfro, PhD / HPC Systems Administrator, Information Technology Services<br>
<a href="tel:931%20372-3601" dir="ltr" x-apple-data-detectors="true" x-apple-data-detectors-type="telephone" x-apple-data-detectors-result="0/1" style="-webkit-text-decoration-color: rgba(0, 0, 0, 0.258824);">931 372-3601</a> / Tennessee Tech University</span></div>
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<blockquote type="cite">On Jan 31, 2020, at 6:23 AM, David Baker <D.J.Baker@soton.ac.uk> wrote:<br>
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Hello,</div>
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Our SLURM cluster is relatively small. We have 350 standard compute nodes each with 40 cores. The largest job that users can run on the partition is one requesting 32 nodes. Our cluster is a general university research resource and so there are many different
sizes of jobs ranging from single core jobs, that get routed to a serial partition via the job-submit.lua, through to jobs requesting 32 nodes. When we first started the service, 32 node jobs were typically taking in the region of 2 days to schedule -- recently
queuing times have started to get out of hand. Our setup is essentially...</div>
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<span>PriorityFavorSmall=NO</span>
<div>FairShareDampeningFactor=5<br>
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<div>PriorityFlags=ACCRUE_ALWAYS,FAIR_TREE<br>
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<div>PriorityType=priority/multifactor<br>
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<div>PriorityDecayHalfLife=7-0<br>
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<div>PriorityWeightAge=400000<br>
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<div>PriorityWeightPartition=1000</div>
<div>PriorityWeightJobSize=500000<br>
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<span>PriorityWeightQOS=1000000</span><br>
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PriorityMaxAge=7-0<br>
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To try to reduce the queuing times for our bigger jobs should we potentially increase the <span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">PriorityWeightJobSize factor in the
first instance to bump up the priority of such jobs? Or should we potentially define a set of QOSs which we assign to jobs in our job_submit.lua depending on the size of the job. In other words, let's say there is
<b>large</b> QOS that give the largest jobs a higher priority, and also limits how many of those jobs that a single user can submit?</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Your advice would be appreciated, please. At the moment these large jobs are not accruing a sufficiently high priority to rise
above the other jobs in the cluster.</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">Best regards,</span></div>
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<span style="font-family: Calibri, Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255); display: inline !important">David </span></div>
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