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<p class="MsoNormal">Hi Matt,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Check out the “OverSubscribe” partition parameter. Try setting your partition to “OverSubscribe=YES” and then submitting the jobs with the “—oversubscibe” option (or OverSubscribe=FORCE if you want this to happen for all jobs submitted
to the partition). Either oversubscribe option can be followed by a colon and the maximum number of jobs that can be assigned to a resource (iirc it defaults to 4 – so you might want to increase to allow the number of jobs you need – ie, maximum number of
jobs you need to run simultaneously divided by number of cores available in the partition).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Matt Jay<o:p></o:p></p>
<p class="MsoNormal">HPC Systems Engineer - Hyak<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt">Research Computing</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt">University of Washington Information Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> slurm-users [mailto:slurm-users-bounces@lists.schedmd.com]
<b>On Behalf Of </b>Matt Hohmeister<br>
<b>Sent:</b> Thursday, September 26, 2019 9:14 AM<br>
<b>To:</b> slurm-users@schedmd.com<br>
<b>Subject:</b> [slurm-users] Running multiple jobs simultaneously<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a two-node cluster running Slurm, and I’m being asked about allowing multiple jobs (hundreds of jobs) to run simultaneously. Following is my scheduling part of slurm.conf, which I changed to allow multiple jobs to run on each node:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""># SCHEDULING<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#DefMemPerCPU=0<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">FastSchedule=1<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#MaxMemPerCPU=0<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SchedulerTimeSlice=30<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">SchedulerType=sched/backfill<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">SelectType=select/cons_res<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">SelectTypeParameters=CR_Core<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For testing purposes, I’m running this job:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#!/bin/bash<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --job-name=whatever<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --output=slurmBatchLists_Aug19.out<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --error=slurmBatchLists_Aug19.err<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --partition=debug<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --nodes=1<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --array=70-100<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">#SBATCH --cpus-per-task=5<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">matlab -nodisplay -nojvm -r 'sampleSlurm($SLURM_ARRAY_TASK_ID);'<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">…which gives me the following squeue output:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">[mhohmeis@odin ~]$ squeue<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> JOBID PARTITION NAME USER ST TIME NODES NODELIST(REASON)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_[82-100] debug whatever mhohmeis PD 0:00 1 (Resources)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1755_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1756_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1757_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1758_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1759_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1760_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1761_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1762_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1763_[70-100] debug whatever mhohmeis PD 0:00 1 (Priority)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_70 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_71 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_72 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_73 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_74 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_75 debug whatever mhohmeis R 0:03 1 odin<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_76 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_77 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_78 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_79 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_80 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 1742_81 debug whatever mhohmeis R 0:03 1 thor<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">They’re interested in allowing *<b>all</b>* these jobs to run simultaneously. Also, when they add #SBATCH --ntasks=30 to the above .sbatch file, this happens when they try to run it:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New"">[mhohmeis@odin ~]$ squeue<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> JOBID PARTITION NAME USER ST TIME NODES NODELIST(REASON)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Courier New""> 2052_[70-100] debug whatever mhohmeis PD 0:00 4 (PartitionConfig)<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Any thoughts?<o:p></o:p></p>
<p class="MsoNormal">Thanks!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Matt Hohmeister<o:p></o:p></p>
<p class="MsoNormal">Systems and Network Administrator<o:p></o:p></p>
<p class="MsoNormal">Department of Psychology<o:p></o:p></p>
<p class="MsoNormal">Florida State University<o:p></o:p></p>
<p class="MsoNormal">PO Box 3064301<o:p></o:p></p>
<p class="MsoNormal">Tallahassee, FL 32306-4301<o:p></o:p></p>
<p class="MsoNormal">Phone: +1 850 645 1902<o:p></o:p></p>
<p class="MsoNormal">Fax: +1 850 644 7739<br>
Pronouns: he/him/his<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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