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On Sat, Jun 1, 2024 at 11: 39 PM Carpenter, Mark H. (LARC-D302) via petsc-users <petsc-users@ mcs. anl. gov> wrote: Mark Carpenter, NASA Langley. I am a novice PETSC user of about 10 years. I’ve build a DG-FEM code with petsc as one of the
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<div dir="ltr"><div dir="ltr">On Sat, Jun 1, 2024 at 11:39 PM Carpenter, Mark H. (LARC-D302) via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2573052961161134154">
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Mark Carpenter, NASA Langley. I am a novice PETSC user of about 10 years. I’ve build a DG-FEM code with petsc as one of the solver paths (I have my own as well). Furthermore, I use petsc for MPI communication. I’m running the DG-FEM
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<p class="MsoNormal">Mark Carpenter, NASA Langley.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am a novice PETSC user of about 10 years. I’ve build a DG-FEM code with petsc as one of the solver paths (I have my own as well). Furthermore, I use petsc for MPI communication.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I’m running the DG-FEM code on our NAS supercomputer. Everything works when my integer sizes are small. When I exceed the 2^32 limit of integer arithmetic the code fails in very strange ways.<u></u><u></u></p>
<p class="MsoNormal">The users that originally set up the petsc infrastructure in the code are no longer at NASA and I’m “dead in the water”.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I think I’ve promoted all the integers that are problematic in my code (F95). On PETSC side: I’ve tried<u></u><u></u></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">Reinstall petsc with –with-64-bit-integers (no luck)</li></ol></div></div></div></blockquote><div><br></div><div>That option does not exist, so this will not work.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2573052961161134154"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_3021406515665623195WordSection1"><ol style="margin-top:0in" start="1" type="1"><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in"><u></u><u></u></li><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">Reinstall petsc with –with-64-bit-integers and –with-64-bit-indices (code will not compile with these options. Additional variables on F90 side require promotion and then the errors
cascade through code when making PETSC calls.</li></ol></div></div></div></blockquote><div><br></div><div>We should fix this. I feel confident we can get the code to compile.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2573052961161134154"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_3021406515665623195WordSection1"><ol style="margin-top:0in" start="1" type="1"><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in"><u></u><u></u></li><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">It’s possible that I’ve missed offending integers, but the petsc error messages are so cryptic that I can’t even tell where it is failing.<u></u><u></u></li></ol>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Further complicating matters: <u></u><u></u></p>
<p class="MsoNormal">The problem by definition needs to be HUGE. Problem sizes requiring 1000 cores (10^6 elements at P5) are needed to experience the errors, which involves waiting in queues for ½ day at least.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Attached are the <u></u><u></u></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">Install script used to install PETSC on our machine<u></u><u></u></li><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">The Makefile used on the fortran side<u></u><u></u></li><li class="m_3021406515665623195MsoListParagraph" style="margin-left:0in">A data dump from an offending simulation (which is huge and I can’t see any useful information.)<u></u><u></u></li></ol>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">How do I attack this problem.<u></u><u></u></p>
<p class="MsoNormal">(I’ve never gotten debugging working properly).</p></div></div></div></blockquote><div><br></div><div>Let's get the install for 64-bit indices to work. So we</div><div><br></div><div>1) Configure PETSc adding --with-64bit-indices to the configure line. Does this work? If not, send configure.log</div><div><br></div><div>2) Compile PETSc. Does this work? If not, send make.log</div><div><br></div><div>3) Compile your code. Does this work? If not, send all output.</div><div><br></div><div>4) Do one of the 1/2 day runs and let us know what happens. An alternative is to run a small number</div><div> of processes on a large memory workstation. We do this to test at the lab.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-2573052961161134154"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_3021406515665623195WordSection1">
<p class="MsoNormal">Mark<u></u><u></u></p>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!auF9rrBGDlsDNKTGGczofe7W5jFe6xzdNRcYh93Hu_48IDvf_AkLauQ1sfAdN5qS_ENmKo_z_6HeyWbp2354$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>