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Hi Wadud,</div>
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Yeah, I would guess MPI_Finalize isn't being called, if you're sure you don't see any Darshan warnings about not being able to shutdown properly. I guess you could try to put it in a debugger to confirm.</div>
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If we're sure the app isn't calling finalize, and if we don't have any ways to modify the source or otherwise get it to cleanly shut down, then there is another option. You could always force Darshan into non-MPI (i.e., single process) mode by setting
<code>DARSHAN_ENABLE_NONMPI=1</code> in your environment. That will cause it to generate independent logs for each MPI rank.</div>
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Having a log per process complicates analysis of larger MPI jobs though, especially since Darshan analysis tools currently take a single log as input ... You can always use the
<code>darshan-merge </code><code style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif;">utility to try to combine the per-process logs back into one:</code></div>
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darshan-merge --shared-redux --output combined-log.darshan <input log file glob></div>
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Thanks,</div>
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--Shane</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Wadud Miah <wadud.miah@ku.ac.ae><br>
<b>Sent:</b> Tuesday, November 26, 2024 3:33 AM<br>
<b>To:</b> Snyder, Shane <ssnyder@mcs.anl.gov>; darshan-users@lists.mcs.anl.gov <darshan-users@lists.mcs.anl.gov><br>
<b>Subject:</b> RE: Darshan trace file not created for WRF</font>
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Hi Shane, I had a look at the output and error files and the only Darshan content that I can find are (shown in boldface): #darshan: <op> <nprocs> <time> starting wrf task 48 of 104 darshan: init 104 0. 045284 starting wrf task</div>
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Hi Shane,</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">I had a look at the output and error files and the only Darshan content that I can find are (shown in boldface):</span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11.0pt">#darshan:<op> <nprocs> <time></span></b></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">starting wrf task 48 of 104</span></p>
<p class="x_MsoNormal"><b><span style="font-size:11.0pt">darshan:init 104 0.045284</span></b></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">starting wrf task 72 of 104</span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt"> </span></p>
<p class="x_MsoNormal"><span style="font-size:11.0pt">Seems to imply that MPI_FINALIZE() isn’t being called, but the WRF application seems to have finished normally. Is there anything else you can suggest?</span></p>
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<p class="x_MsoNormal"><span style="font-size:11.0pt">Regards,</span></p>
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<p class="x_MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt; font-family:"Calibri",sans-serif"> Snyder, Shane <ssnyder@mcs.anl.gov>
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<b>Sent:</b> 16 November 2024 01:03<br>
<b>To:</b> Wadud Miah <wadud.miah@ku.ac.ae>; darshan-users@lists.mcs.anl.gov<br>
<b>Subject:</b> Re: Darshan trace file not created for WRF</span></p>
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<p class="x_MsoNormal"><span style="color:black">One thing you can check is setting DARSHAN_INTERNAL_TIMING=1 in your environment — this will make Darshan print out a little bit of internal library timing information at initialize/finalize time which could
give us a better clue about how far Darshan is getting.</span></p>
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<p class="x_MsoNormal"><span style="color:black">Just guessing, but is it possible the job isn't calling MPI_Finalize()? That's when Darshan generates the log file for MPI applications. Usually, I would expect some sort of warning message if the app
<i>does </i>call MPI_Finalize() and Darshan doesn't succeed in generating the log file. </span></p>
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<p class="x_MsoNormal"><span style="color:black">Using LD_PRELOAD is also usually pretty fail-safe in terms of ensuring Darshan properly intercepts what the app is doing. That said, is it possible the app is somehow statically linking the MPI library? You could
run ldd <wrf_executable_path> and ensure that you see libmpi.so listed? That would confirm MPI is linked dynamically which would theoretically be easy to instrument using LD_PRELOAD the way you are.</span></p>
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<p class="x_MsoNormal"><span style="color:black">--Shane</span></p>
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on behalf of Wadud Miah <<a href="mailto:wadud.miah@ku.ac.ae">wadud.miah@ku.ac.ae</a>><br>
<b>Sent:</b> Thursday, November 14, 2024 11:34 PM<br>
<b>To:</b> <a href="mailto:darshan-users@lists.mcs.anl.gov">darshan-users@lists.mcs.anl.gov</a> <<a href="mailto:darshan-users@lists.mcs.anl.gov">darshan-users@lists.mcs.anl.gov</a>><br>
<b>Subject:</b> [Darshan-users] Darshan trace file not created for WRF</span> </p>
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<p class="x_MsoNormal" style=""><span style="font-size:1.0pt; color:white">Hi, I am trying to profile the I/O of WRF and have the following settings: export DARSHAN_LOGPATH=/home/miahw/WRF_WADUD_PRE-COMPILED LD_PRELOAD=/home/miahw/openmpi-4.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">1-darshan-3.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">4.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">5/lib/libdarshan.</span><span style="font-size:1.0pt; font-family:"Arial",sans-serif; color:white"> </span><span style="font-size:1.0pt; color:white">so
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<p class="x_xmsonormal">Hi,</p>
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<p class="x_xmsonormal">I am trying to profile the I/O of WRF and have the following settings:</p>
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<p class="x_xmsonormal">export DARSHAN_LOGPATH=/home/miahw/WRF_WADUD_PRE-COMPILED</p>
<p class="x_xmsonormal">LD_PRELOAD=/home/miahw/openmpi-4.1-darshan-3.4.5/lib/libdarshan.so mpirun -n $SLURM_NTASKS /apps/ku/gcc-9_4/openmpi-4_1/wrf/4.0/WRF/run/wrf.exe</p>
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<p class="x_xmsonormal">However, no trace file gets created and the job stdout and stderr does not contain any Darshan warning/error messages. Can anyone suggest a way to increase debug level to investigate this further?
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<p class="x_xmsonormal">Regards,</p>
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