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<p class="MsoNormal"><span style="font-size:11.0pt">Barry, thanks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am accessing PETSc through MOOSE. I need to figure out if the versions are consistent and how to test it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">-Ling<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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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="color:black">From:
</span></b><span style="color:black">Barry Smith <bsmith@petsc.dev><br>
<b>Date: </b>Saturday, August 17, 2024 at 12:08</span><span style="font-family:"Arial",sans-serif;color:black"> </span><span style="color:black">PM<br>
<b>To: </b>Zou, Ling <lzou@anl.gov><br>
<b>Cc: </b>petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov><br>
<b>Subject: </b>Re: [petsc-users] PCFactorSetMatOrderingType not working with 3.21<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">I have attached src/snes/tutorials/ex5.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">c
in which I tried to reproduce your problem by inserting the code you've indicated. However I am not getting the problem you see, I am seeing, type: ilu out-of-place factorization 0 levels of fill tolerance
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> I have attached src/snes/tutorials/ex5.c in which I tried to reproduce your problem by inserting the code you've indicated.
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> However I am not getting the problem you see, I am seeing,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:10.5pt;font-family:Menlo"> type: ilu<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:Menlo"> out-of-place factorization<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:Menlo"> 0 levels of fill<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:Menlo"> tolerance for zero pivot 2.22045e-14<o:p></o:p></span></p>
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<span style="font-size:10.5pt;font-family:Menlo"> matrix ordering: rcm<o:p></o:p></span></p>
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<p class="MsoNormal">when I run with -pc_type ilu -snes_view<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Can you please confirm you get the same problem with the attached ex5.c ? You could send your code to see if I can reproduce the problem.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> I am using the release branch of PETSc <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Barry<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Aug 17, 2024, at 12:35<span style="font-family:"Arial",sans-serif"> </span>PM, Zou, Ling via petsc-users <petsc-users@mcs.anl.gov> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Hi all,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">The following codes are how I used to setup PC mat ordering:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> // Setup KSP/PC (at this moment, user-input options and commandline options are available)</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> SNESGetKSP(snes, &ksp);</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> KSPSetFromOptions(ksp);</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> PC pc;</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> KSPGetPC(ksp, &pc);</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> <span class="xapple-converted-space"> </span><span style="color:black;background:yellow">PCFactorSetMatOrderingType(pc, MATORDERINGRCM);</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> // PCFactorSetLevels(pc, 5);</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> SNESSetFromOptions(snes);</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">After switching to PETSc 3.21, this no longer works, and can be confirmed from ‘-snes_view’ output:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> PC Object: 1 MPI process</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> type: ilu</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> out-of-place factorization</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> 0 levels of fill</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> tolerance for zero pivot 2.22045e-14</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> using diagonal shift to prevent zero pivot [NONZERO]</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:Monaco"> <span class="xapple-converted-space"> </span><span style="color:black;background:yellow">matrix ordering: natural</span></span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">The command line option still works, i.e., ‘-pc_factor_mat_ordering_type rcm’ gives me the correct behavior.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Questions:</span><o:p></o:p></p>
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<li class="xmsolistparagraph" style="margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1">
<span style="font-size:11.0pt">Is this a bug introduced in the new version, or</span><o:p></o:p></li><li class="xmsolistparagraph" style="margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo1">
<span style="font-size:11.0pt">With the new version, I should call this function at a different time?</span><o:p></o:p></li></ul>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Best,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">-Ling</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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