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<p class="MsoNormal">I don’t know from experience if Slurm behaves unexpectedly with “unlimited” versus some large number, like 30 days; but barring something unexpected, it seems like time limits shouldn’t be the problem.
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<p class="MsoNormal">John<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">slurm-users <slurm-users-bounces@lists.schedmd.com> on behalf of c b <breedthoughts.www@gmail.com><br>
<b>Reply-To: </b>Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Date: </b>Friday, November 1, 2019 at 11:09 AM<br>
<b>To: </b>Slurm User Community List <slurm-users@lists.schedmd.com><br>
<b>Subject: </b>Re: [slurm-users] job priority keeping resources from being used?<o:p></o:p></span></p>
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<p class="MsoNormal">On my low resource jobs I'm setting the time to 1 hour, and on my large ones I'm setting time=unlimited.
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<p class="MsoNormal">Is the unlimited part the problem? I have that setting because in my cluster there are some machines that come in and out during the day via reservations, and I want to keep these larger jobs from running on those machines.<o:p></o:p></p>
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<p class="MsoNormal">On Fri, Nov 1, 2019 at 10:56 AM Burian, John <<a href="mailto:John.Burian@nationwidechildrens.org">John.Burian@nationwidechildrens.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Are you setting realistic job run times (sbatch –t <time>)?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Slurm won’t backfill low priority jobs (with low resource requirements) in front of a high priority job (blocked waiting on high resource requirements) if it thinks the low priority
jobs will delay the eventual start of the high priority job. If all jobs are submitted with the same job run time, then Slurm will never backfill, because as far as Slurm knows, the low priority jobs will take longer to finish than just waiting for the current
running jobs to finish.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">John<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">slurm-users <<a href="mailto:slurm-users-bounces@lists.schedmd.com" target="_blank">slurm-users-bounces@lists.schedmd.com</a>> on behalf of c b <<a href="mailto:breedthoughts.www@gmail.com" target="_blank">breedthoughts.www@gmail.com</a>><br>
<b>Reply-To: </b>Slurm User Community List <<a href="mailto:slurm-users@lists.schedmd.com" target="_blank">slurm-users@lists.schedmd.com</a>><br>
<b>Date: </b>Friday, November 1, 2019 at 10:30 AM<br>
<b>To: </b>"<a href="mailto:slurm-users@lists.schedmd.com" target="_blank">slurm-users@lists.schedmd.com</a>" <<a href="mailto:slurm-users@lists.schedmd.com" target="_blank">slurm-users@lists.schedmd.com</a>><br>
<b>Subject: </b>[slurm-users] job priority keeping resources from being used?</span><o:p></o:p></p>
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<span style="font-size:12.0pt;color:white">[WARNING: External Email - Use Caution]</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi,
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Apologies for the weird subject line...I don't know how else to describe what I'm seeing.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Suppose my cluster has machines with 8 cores each. I have many large high priority jobs that each require 6 cores, so each machine in my cluster runs one of each of these jobs
at a time. However, I also have lots of small jobs that each require one core, and these jobs have low priority so in my queue they are behind all my large jobs. <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">In theory, these small jobs could slip in and run alongside the large jobs, but I'm not seeing that happen. So my machines have two cores sitting idle when they could be doing
work. How do I configure slurm to run these jobs better?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">thanks for any help.<o:p></o:p></p>
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