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When running directly in an interactive allocation, I get the output below. Yes, Perlmutter is SLURM. Could there be some way to force the node-local MPICH to run without PMI? Using -launcher fork does not seem to have an effect. I can use a very minimal
MPICH but I do need GPU support. Thanks</div>
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$ /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/mpiexec -n 2 ./main.x</div>
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host: x4217c5s3b0n0.hsn.cm.aurora.alcf.anl.gov</div>
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[mpiexec@x4217c5s3b0n0] Timeout set to -1 (-1 means infinite)</div>
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==================================================================================================</div>
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mpiexec options:</div>
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----------------</div>
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Base path: /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/</div>
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Launcher: (null)</div>
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Debug level: 1</div>
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Enable X: -1</div>
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Global environment:</div>
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-------------------</div>
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...</div>
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mpiexec@x4217c5s3b0n0] Launch arguments: /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/hydra_pmi_proxy --control-port x4217c5s3b0n0.hsn.cm.aurora.alcf.anl.gov:41641 --debug --rmk pbs --launcher ssh --demux poll --pgid 0 --retries 10 --usize -2 --pmi-port 0
--gpus-per-proc -2 --gpu-subdevs-per-proc -2 --proxy-id 0 </div>
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[proxy:0@x4217c5s3b0n0] Sending upstream hdr.cmd = CMD_PID_LIST</div>
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[proxy:0@x4217c5s3b0n0] Sending upstream hdr.cmd = CMD_STDERR</div>
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[proxy:0@x4217c5s3b0n0] Sending upstream hdr.cmd = CMD_STDERR</div>
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Abort(672810000): Fatal error in internal_Init: Internal MPI error!, error stack:</div>
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internal_Init(70)...............: MPI_Init(argc=(nil), argv=(nil)) failed</div>
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MPII_Init_thread(204)...........: </div>
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MPIR_pmi_init(225)..............: </div>
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check_MPIR_CVAR_PMI_VERSION(158): Runtime environment uses unsupported PMI version PMI-1 or PMI-2. Aborting.</div>
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Abort(672810000): Fatal error in internal_Init: Internal MPI error!, error stack:</div>
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internal_Init(70)...............: MPI_Init(argc=(nil), argv=(nil)) failed</div>
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MPII_Init_thread(204)...........: </div>
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MPIR_pmi_init(225)..............: </div>
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check_MPIR_CVAR_PMI_VERSION(158): Runtime environment uses unsupported PMI version PMI-1 or PMI-2. Aborting.</div>
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[proxy:0@x4217c5s3b0n0] Sending upstream hdr.cmd = CMD_EXIT_STATUS</div>
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<b>From:</b> Zhou, Hui <zhouh@anl.gov><br>
<b>Sent:</b> Thursday, April 23, 2026 12:21<br>
<b>To:</b> Zhou, Hui via devel <devel@mpich.org><br>
<b>Cc:</b> Wozniak, Justin M. <woz@anl.gov><br>
<b>Subject:</b> Re: Aurora: Trying to start MPICH inside bigger job</div>
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<i>/opt/cray/pals/1.8/bin/mpiexec \</i></div>
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<i> env $UNSETS \</i></div>
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<i> /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/mpiexec -n 2 \</i></div>
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<i> ~/../main.x</i></div>
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First, are you able to run hydra (MPICH's mpiexec) directly, i.e. `<span style="color: black;"><i> /lus/flare/projects/EpiCalib/sfw/mpich-git/bin/mpiexec -n 2 ~/../main.x`?</i></span></div>
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If that went well, then the key issue is we have two PMI environment concurrently active. One from PALs, assumably running PMIx; and one from hydra, assumably running PMI-1. This may confuse the MPI processes on which PMI protocol to use. </div>
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What is the launcher on Perlmutter? Is it Slurm? It will have the same double active PMI environment issue, but I guess it happened to work.</div>
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What is the error in MPI_Init are you seeing?</div>
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Hui</div>
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<b>From:</b> Wozniak, Justin M. via devel <devel@mpich.org><br>
<b>Sent:</b> Thursday, April 23, 2026 12:04 PM<br>
<b>To:</b> Zhou, Hui via devel <devel@mpich.org><br>
<b>Cc:</b> Wozniak, Justin M. <woz@anl.gov><br>
<b>Subject:</b> [mpich-devel] Aurora: Trying to start MPICH inside bigger job</div>
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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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<p style="direction: ltr; margin-top: 1em; margin-bottom: 1em;"><span style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Justin M Wozniak</span></p>
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