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<p class="MsoNormal">My Slurm/MPICH job is failing when it calls the MPI function MPI_Comm_spawn. That function is specifically mentioned in the Slurm MPI guide
<a href="https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fslurm.schedmd.com%2Fmpi_guide.html%23mpich2&data=04%7C01%7Ckurt.e.mccall%40nasa.gov%7C03a66726fdb847e6896e08d9d217f8bc%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637771822668037279%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=%2Bp0cRhC%2FxfGh3dL9Ml5aFQRkIVumdkmr4wshxRW1UJ8%3D&reserved=0">
https://slurm.schedmd.com/mpi_guide.html#mpich2</a>, where it states<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:13.5pt">MPICH2 with mpiexec
<o:p></o:p></span></b></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Do not add any flags to mpich and build the default (e.g. "<i>./configure -prefix ...
</i>". Do NOT pass the --with-slurm, --with-pmi, --enable-pmiport options).<br>
Do not add -lpmi to your application (it will force slurm's pmi 1 interface which doesn't support PMI_Spawn_multiple).<br>
Launch the application using salloc to create the job allocation and mpiexec to launch the tasks. A simple example is shown below.<o:p></o:p></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Courier New"">salloc -N 2 mpiexec my_application<o:p></o:p></span></b></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:red">All MPI_comm_spawn work fine now going through hydra's PMI 1.1 interface.<o:p></o:p></span></b></p>
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<b><span style="color:red"><o:p> </o:p></span></b></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="color:red"><o:p> </o:p></span></b></p>
<p class="MsoNormal">The way this is worded, it sounds like a bug involving MPI_Comm_spawn was fixed at some point. Does anyone remember if this is the case, and if the fix happened after 20.02.3? I’m wondering if stepping up to a more recent version of
Slurm would solve this problem.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Kurt <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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