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<p class="MsoNormal"><span style="font-size:11.0pt">That’s nice. Thank you!<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>Sunday, August 18, 2024 at 6:31</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">You can call PCSetType(pc,PCILU); KSPSetFromOptions(ksp); PCFactorSetMatOrderingType(pc,.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">);
This reproduces the old behavior in PETSc. You can still pass -pc_type somethingelse at runtime to use a different PC.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">On Aug 18,
2024, at 6:</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">19 PM,
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:#D0D8DC"><span style="color:black"> </span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> You can call <o:p></o:p></p>
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<p class="MsoNormal"> PCSetType(pc,PCILU); <o:p></o:p></p>
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<p class="MsoNormal"> KSPSetFromOptions(ksp);<o:p></o:p></p>
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<p class="MsoNormal"> PCFactorSetMatOrderingType(pc,....);<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> This reproduces the old behavior in 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"> You can still pass -pc_type somethingelse at runtime to use a different PC.<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 18, 2024, at 6:19<span style="font-family:"Arial",sans-serif"> </span>PM, Zou, Ling <lzou@anl.gov> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Thank you, Barry. You must be right in this case. I am defaulting to ILU.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I did an additional test to confirm, with ‘-pc_type ilu’ in the command line, it works fine.</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">If I am defaulting to ILU, when should I call<span class="apple-converted-space"> </span></span>PCFactorSetMatOrderingType?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">-Ling<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" style="margin-bottom:12.0pt"><b>From:<span class="apple-converted-space"> </span></b>Barry Smith <<a href="mailto:bsmith@petsc.dev">bsmith@petsc.dev</a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Sunday, August 18, 2024 at 12:22<span style="font-family:"Arial",sans-serif"> </span>PM<br>
<b>To:<span class="apple-converted-space"> </span></b>Zou, Ling <<a href="mailto:lzou@anl.gov">lzou@anl.gov</a>><br>
<b>Cc:<span class="apple-converted-space"> </span></b><a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a><span class="apple-converted-space"> </span><<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: [petsc-users] PCFactorSetMatOrderingType not working with 3.21<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:1.0pt;color:white">Are you using -pc_type ilu at the command line in your test? Or just letting it default to using ILU? This could explain the difference, the decision of what preconditioner to default to has moved
until later in code, not when the PC is created<span class="apple-converted-space"> </span></span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> Are you using -pc_type ilu at the command line in your test? Or just letting it default to using ILU?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"> This could explain the difference, the decision of what preconditioner to default to has moved until later in code, not when the PC is created or the matrix supplied but when it starts to build the preconditioner. Hence when you call PCFactorSetMatOrderingType()
in the code the PC may not yet be set to ILU (or anything) hence the PCFactorSetMatOrderingType() is ignored,<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 3:44<span style="font-family:"Arial",sans-serif"> </span>PM, Zou, Ling <<a href="mailto:lzou@anl.gov">lzou@anl.gov</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Barry, thanks.</span><o:p></o:p></p>
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<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.</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" style="margin-bottom:12.0pt"><b>From:<span class="apple-converted-space"> </span></b>Barry Smith <<a href="mailto:bsmith@petsc.dev">bsmith@petsc.dev</a>><br>
<b>Date:<span class="apple-converted-space"> </span></b>Saturday, August 17, 2024 at 12:08<span style="font-family:"Arial",sans-serif"> </span>PM<br>
<b>To:<span class="apple-converted-space"> </span></b>Zou, Ling <<a href="mailto:lzou@anl.gov">lzou@anl.gov</a>><br>
<b>Cc:<span class="apple-converted-space"> </span></b><a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a><span class="apple-converted-space"> </span><<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: [petsc-users] PCFactorSetMatOrderingType not working with 3.21<o:p></o:p></p>
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<p class="MsoNormal"><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</span><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"> 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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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"> type: ilu</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"> out-of-place factorization</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"> 0 levels of fill</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"> tolerance for zero pivot 2.22045e-14</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Menlo"> matrix ordering: rcm</span><o:p></o:p></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">On Aug 17, 2024, at 12:35<span style="font-family:"Arial",sans-serif"> </span>PM, Zou, Ling via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<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: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">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: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">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">Questions:</span><o:p></o:p></p>
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<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">Best,</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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