<div dir="ltr"><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">Hi Wei-Keng,</div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d">I found the issue with help from TACC user support:<br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><a href="https://www.intel.com/content/www/us/en/developer/articles/technical/large-mpi-tags-with-the-intel-mpi.html" target="_blank">https://www.intel.com/content/www/us/en/developer/articles/technical/large-mpi-tags-with-the-intel-mpi.html</a></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><br></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">I set Setting Environment MPIR_CVAR_CH4_OFI_RANK_BITS=15</span><br style="box-sizing:inherit;color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">   Setting Environment MPIR_CVAR_CH4_OFI_TAG_BITS=24</span><br style="box-sizing:inherit;color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">and added a print statement:</span><br style="box-sizing:inherit;color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">cam_restart.F90     123 Maximum tag value queried   8388607</span><br style="box-sizing:inherit;color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial"><span style="color:rgb(29,28,29);font-family:Slack-Lato,Slack-Fractions,appleLogo,sans-serif;font-size:15px;font-style:normal;font-variant-ligatures:common-ligatures;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(248,248,248);text-decoration-style:initial;text-decoration-color:initial;display:inline;float:none">this appears to be working. <br></span></div><div class="gmail_default" style="font-family:comic sans ms,sans-serif;color:#38761d"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jun 21, 2022 at 7:25 PM Wei-Keng Liao <<a href="mailto:wkliao@northwestern.edu" target="_blank">wkliao@northwestern.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



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Hi, Jim
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<div>Is the ncmpi_enddef the first enddef call after the file creation,</div>
<div>or after a ncmpi_redef?</div>
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<div>In the former case, there is no MPI communication in PnetCDF, except</div>
<div>for an MPI_Barrier. In the latter case, if the file header size expands,</div>
<div>existing variables need to be moved to higher offsets, which require</div>
<div>PnetCDF to call MPI collective reads and writes and thus leads to MPI_Issend.</div>
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<div>Can you try to get a coredump so to trace the call stacks?</div>
<div><br>
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<div>You can also enable PnetCDF safe mode which will make additional MPI</div>
<div>communication calls for debugging purpose. Sometimes it helps narrow</div>
<div>down the problem cause. It can be enabled by setting environment</div>
<div>variable PNETCDF_SAFE_MODE to 1.</div>
<div><br>
<div>Wei-keng </div>
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<div>On Jun 21, 2022, at 5:03 PM, Jim Edwards <<a href="mailto:jedwards@ucar.edu" target="_blank">jedwards@ucar.edu</a>> wrote:</div>
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I am using pnetcdf 1.12.3 and getting an error when compiled with intel/19.1.1 and impi/19.0.9 on the TACC Frontera system</div>
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I am getting very little information to guide me in debugging the error.   <br>
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[785] Abort(634628) on node 785 (rank 785 in comm 0): Fatal error in PMPI_Issend: Invalid tag, error stack:<br>
[785] PMPI_Issend(156): MPI_Issend(buf=0x2b5c81edf40f, count=1025120, MPI_BYTE, dest=0, tag=1048814, comm=0xc40000d7, request=0x7f2002783540) failed<br>
[785] PMPI_Issend(95).: Invalid tag, value is 1048814<br>
TACC:  MPI job exited with code: 4 <br>
TACC:  Shutdown complete. Exiting. <br>
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I can tell that I am in a call to ncmpi_enddef but not getting anything beyond that - any ideas?  <br>
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<div>Jim Edwards<br>
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<font size="1">CESM Software Engineer<br>
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<font size="1">National Center for Atmospheric Research<br>
</font></div>
<font size="1">Boulder, CO</font> <br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr"><div dir="ltr"><div><div><div>Jim Edwards<br><br></div><font size="1">CESM Software Engineer<br></font></div><font size="1">National Center for Atmospheric Research<br></font></div><font size="1">Boulder, CO</font> <br></div></div>