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Hi Jonathon,</div>
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Since the binary name is "<font size="2"><span style="font-size:11pt">mpich-ofi-gnu9-ohpc-3.4.2-3.1.ohpc.2.4.x86_64</span></font>", I assume it is mpich -3.4.2 configured with ch4:ofi. We no longer use mpich2 to refer to the project, just mpich.</div>
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With ch4:ofi, try setting the following environment variables:</div>
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FI_PROVIDER=tcp</div>
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FI_TCP_IFACE=eth0</div>
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That assumes you want to use the tcp provider and the private interface is eth0. There are other providers that you may choose and the iface selection variables will be different. You can set MPIR_CVAR_DEBUG_SUMMARY=1 to show the list of providers mpich probes
during init.<br>
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<br>
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Best wishes,</div>
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-- <br>
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Hui<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jonathon Anderson via discuss <discuss@mpich.org><br>
<b>Sent:</b> Thursday, June 30, 2022 10:49 PM<br>
<b>To:</b> discuss@mpich.org <discuss@mpich.org><br>
<b>Cc:</b> Jonathon Anderson <janderson@ciq.co><br>
<b>Subject:</b> Re: [mpich-discuss] How to specify which Ethernet / IP interface to use?</font>
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<div class="PlainText">I'm trying to use mpich2 [1] on a cluster of compute nodes each of<br>
which has two Ethernet interfaces: one, an encumbered public /<br>
Internet interface, and another a private / intranet interface. mpich<br>
is defaulting to trying to use the public interface, which then hangs<br>
indefinitely with both nodes in my job stuck listening via UDP.<br>
<br>
I experience the same behavior whether I use mpiexec or srun --mpi=pmi2.<br>
<br>
How do I tell mpich which interface to use?<br>
<br>
Thanks!<br>
<br>
~jonathon<br>
<br>
<br>
[1]: mpich-ofi-gnu9-ohpc-3.4.2-3.1.ohpc.2.4.x86_64<br>
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