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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Martin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My apologies for the lack of update on this topic. We did not include this patch because even with successful compilation, MPICH hcoll integration does not function correctly at runtime in our tests. Due to
other priorities, we have not yet spent the time to fix the issue.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Ken<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<b><span style="color:black">From: </span></b><span style="color:black">Audet, Martin via discuss <discuss@mpich.org><br>
<b>Date: </b>Monday, June 23, 2025 at 10:04</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">AM<br>
<b>To: </b>discuss@mpich.org <discuss@mpich.org><br>
<b>Cc: </b>Audet, Martin <Martin.Audet@cnrc-nrc.gc.ca><br>
<b>Subject: </b>[mpich-discuss] mpich 4.3.1 still have compilation problem when using --with-hcoll=/opt/mellanox/hcoll<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in;mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">Hello, It seems that the silly compilation problem with hcoll_rte.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">c
I had back in April with mpich 4.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">3.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">0
when using --with-hcoll=/opt/mellanox/hcoll configuration option is still present in 4.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">3.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">1,
see: https:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">//lists.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">mpich.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">org/mailman/htdig/discuss/2025-April/006725.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">html<o:p></o:p></span></p>
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<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">Hello,<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">It seems that the silly compilation problem with hcoll_rte.c I had back in April with mpich 4.3.0 when using --with-hcoll=/opt/mellanox/hcoll configuration option is still
present in 4.3.1, see:<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><a href="https://urldefense.us/v3/__https:/lists.mpich.org/mailman/htdig/discuss/2025-April/006725.html__;!!G_uCfscf7eWS!fvaja_SlDAvIzwz1hZZHt1QY74b9Va08hlq4gBLPtbxoN3xFpFmYKz6GBSA1PFywgC_JRwhwv3olRL2syH0Mhruza_g$">https://lists.mpich.org/mailman/htdig/discuss/2025-April/006725.html</a><o:p></o:p></span></p>
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<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">It seems that the following very simple patch I was told to try with 4.3.0 haven't been included in 4.3.1:<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black">--- src/mpid/common/hcoll/hcoll_rte.c 2025-04-16 12:54:24.847337975 -0400</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black">+++ src/mpid/common/hcoll/hcoll_rte.c 2025-04-16 12:55:05.428164974 -0400</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black">@@ -55,7 +55,7 @@</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> /* FIXME: The hcoll library needs to be updated to return</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> * error codes. The progress function pointer right now</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> * expects that the function returns void. */</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black">- ret = hcoll_do_progress(&made_progress);</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black">+ ret = hcoll_do_progress(-1, &made_progress);</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> MPIR_Assert(ret == MPI_SUCCESS);</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> }</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Consolas;color:black"> }</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">So it look like this code path is not compiled very often by mpich developers or it's QA process.
<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">BTW applying the same patch fix the compilation problem, but:<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">What does it mean for us users ? Should we still use this option ? BTW hcoll is a very cool mechanism for improving collective operations efficiency. Is this option obsolete
? Was it replaced by something else ?<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
<p style="margin-left:.5in"><span style="font-family:"Calibri",sans-serif;color:black">Martin Audet<o:p></o:p></span></p>
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