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<p class="MsoNormal">Hi Avery,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">pmix: we just use the standard Ubuntu packages on 20.04. Unfortunately the standard packages on 18.04 are too out of date for us.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">openmpi: we build our own, using ./configure --with-pmix=internal …<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">slurm: we build our own, using ./configure --with-pmix=PATH … (<a href="https://github.com/NVIDIA/nephele-packages/blob/42145aef4bbe2cff335a1fca222766232dab7aa7/slurm/debian/rules#L41">see
here</a>)<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then we can set MpiDefault=pmix (<a href="https://github.com/NVIDIA/nephele/blob/1d79977164d5ef1418466bfb322d59d502c18e8f/ansible/roles/slurm/templates/etc/slurm/slurm.conf.default#L87">see here</a>) and it works.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:Consolas">$ srun --mpi=list<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: MPI types are...<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: cray_shasta<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: pmi2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: pmix_v3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: pmix<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas">srun: none<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hope that helps,<o:p></o:p></p>
<p class="MsoNormal">Luke<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> slurm-users <slurm-users-bounces@lists.schedmd.com>
<b>On Behalf Of </b>Avery Grieve<br>
<b>Sent:</b> Thursday, December 10, 2020 7:52 AM<br>
<b>To:</b> slurm-users@lists.schedmd.com<br>
<b>Subject:</b> [slurm-users] slurm-wlm package OpenMPI PMIx implementation<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">External email: Use caution opening links or attachments</span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:black">
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<p class="MsoNormal">Hi Forum,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I've been putting together an ARM cluster for fun/learning and I've been a bit lost about how to get OpenMPI and slurm to behave together.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I have installed the <a href="https://packages.debian.org/buster/slurm-wlm">
slurm-wlm package </a>from the Debian apt search and compiled OpenMPI from source on my compute nodes. OpenMPI has been compiled with the option --with-slurm and the configure time log indicates openmpi has pmix v3 built in. I thought that would be enough for
slurm and calling a job with "srun -n 4 -N1 executable" (with slurm.conf having MpiDefault=pmix_v3) would be enough.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Not the case, unfortunately as slurm doesn't have any idea what pmix_v3 means without being compiled against it I guess. I have also attempted to compile openmpi from source with the --with-pmi option but the slurm-wlm package doesn't install
any of the libraries/headers (pmi.h pmi2.h pmix.h etc). Neither does any of the slurm-llnl develop packages, so I'm at a loss of what to do here.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">A few notes: OpenMPI is working across my compute nodes. I'm able to ssh to my compute node and start a job manually with mpirun that executes successfully across the nodes. My slurmctld and slurmd daemons work for single thread resource
allocation (and presumably OpenMP multithreading, though I haven't tested this).<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Beyond compiling slurm from source (assuming this installs the pmi headers that I can use to build openmpi), which I have tried with no luck on my devices, is there a way to get slurm and openmpi to behave together using the precompiled
package slurm-wlm?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">~Avery Grieve<o:p></o:p></p>
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<p class="MsoNormal">They/Them/Theirs please!<o:p></o:p></p>
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<p class="MsoNormal">University of Michigan<o:p></o:p></p>
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