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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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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.<o:p></o:p></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”.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Reinstall petsc with –with-64-bit-integers (no luck)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">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.<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">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.<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Further complicating matters: <o:p></o:p></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.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Attached are the <o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">Install script used to install PETSC on our machine<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">The Makefile used on the fortran side<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l1 level1 lfo2">A data dump from an offending simulation (which is huge and I can’t see any useful information.)<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">How do I attack this problem.<o:p></o:p></p>
<p class="MsoNormal">(I’ve never gotten debugging working properly).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Mark<o:p></o:p></p>
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