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Hi</div>
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I am trying to run a simulation ensemble where the system MPI coordinates many tasks, each of which is a call to a plain MPICH-built app (ExaEpi/AMReX). The app runs on its own, but when called from inside the bigger MPI job, it causes an error in MPI_Init().
This approach works on other systems like Perlmutter. I think I can reproduce this with something as simple as:</div>
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/opt/cray/pals/1.8/bin/mpiexec \</div>
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env $UNSETS \</div>
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/lus/flare/projects/EpiCalib/sfw/mpich-git/bin/mpiexec -n 2 \</div>
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~/../main.x</div>
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where main.x is a toy MPI program, mpich-git is my MPICH build on Aurora, and UNSETS is a variety of attempts to unset environment variables, none of this has worked so far. </div>
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Is there any known reason why I am unable to run MPICH inside this context, when it does run on its own?</div>
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Also, any other tips for debugging MPI startup might help. I am using the following but not getting much detail:</div>
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export PMI_DEBUG=1</div>
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export PMIX_DEBUG=1</div>
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export HYDRA_DEBUG=1</div>
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I get:</div>
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[mpiexec@x4217c5s7b0n0] Launch arguments: /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/hydra_pmi_proxy --control-port</div>
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x4217c5s7b0n0:37193 --debug --rmk user --launcher ssh --demux poll --pgid 0 --retries 10 --usize -2 --pmi-port 0</div>
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--gpus-per-proc -2 --gpu-subdevs-per-proc -2 --proxy-id 0</div>
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[proxy:0@x4217c5s7b0n0] Sending upstream hdr.cmd = CMD_PID_LIST</div>
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[proxy:0@x4217c5s7b0n0] Sending upstream hdr.cmd = CMD_STDERR</div>
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Abort(16): Fatal error in internal_Init: Internal MPI error!</div>
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[proxy:0@x4217c5s7b0n0] Sending upstream hdr.cmd = CMD_STDERR</div>
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Abort(16): Fatal error in internal_Init: Internal MPI error!</div>
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[proxy:0@x4217c5s7b0n0] Sending upstream hdr.cmd = CMD_EXIT_STATUS</div>
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x4217c5s7b0n0.hsn.cm.aurora.alcf.anl.gov: rank 0 exited with code 16</div>
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Thanks</div>
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Justin</div>
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<span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Justin M Wozniak<br>
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