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<p>Dear maintainers,</p>
<p><br>
</p>
<p>I recently ran into an issue runnion our software (<a href="https://github.com/KhiopsML/khiops" class="OWAAutoLink" id="LPlnk545272">https://github.com/KhiopsML/khiops</a>) on debian 11.<br>
It is an AutoML suite that uses MPICH to parallelize the computations. It works fine on a variety of platforms and OSes, but with debian 11 it seems that MPICH installation prevents our software from working correctly.</p>
<p><br>
</p>
<p>In fact, after some work trying to clean up the installation, we found that the issue is occuring even with an installation of MPICH alone.</p>
<p>On a fresh debian (started with docker run debian:11)</p>
<p><br>
</p>
<p>docker run -it debian:11 bash</p>
<p><span>root@67506d5ed8a1:/# apt-get update</span> && apt install mpich</p>
<p>.....</p>
<p></p>
<div>Setting up libmpich-dev:amd64 (3.4.1-5~deb11u1) ...<br>
update-alternatives: using /usr/include/x86_64-linux-gnu/mpich to provide /usr/include/x86_64-linux-gnu/mpi (mpi-x86_64-linux-gnu) in auto mode<br>
Processing triggers for libc-bin (2.31-13+deb11u7) ...<br>
root@67506d5ed8a1:/#</div>
<div>
<div>root@67506d5ed8a1:/# mpiexec -bind-to hwthread -map-by core -n 5 ls <-- of course problem occurs also with a real MPI program!<br>
[mpiexec@67506d5ed8a1] control_cb (pm/pmiserv/pmiserv_cb.c:206): assert (!closed) failed<br>
[mpiexec@67506d5ed8a1] HYDT_dmxu_poll_wait_for_event (tools/demux/demux_poll.c:76): callback returned error status<br>
[mpiexec@67506d5ed8a1] HYD_pmci_wait_for_completion (pm/pmiserv/pmiserv_pmci.c:160): error waiting for event<br>
[mpiexec@67506d5ed8a1] main (ui/mpich/mpiexec.c:326): process manager error waiting for completion<br>
root@67506d5ed8a1:/# <br>
</div>
<div><br>
</div>
<div>Sometimes the mpiexec command fails with <br>
</div>
<div><span>[proxy:0:0@67506d5ed8a1] HYDT_topo_bind (tools/topo/topo.c:89): no topology library available</span></div>
<div><br>
</div>
<div>Indeed doing "mpiexec -h" reports no topology library being detected.</div>
<div>Any help moving this issue forward would be greatly appreciated.</div>
<div>Thanks a lot in advance, best regards,</div>
<div><br>
</div>
<div>Stéphane Gouache<br>
<br>
<br>
</div>
<br>
</div>
<br>
<p></p>
</div>
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