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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue">Hi Matt,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:.5in"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue">Thanks! I am not sure it is really needed, not sure if you have seen anything to indicates a big improvement for the different reordering
inside PETSc. I just wanted to make sure I was understanding the results I was seeing.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue">Sorry if I submitted to the wrong email.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif;color:blue">steve<o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Matthew Knepley <knepley@gmail.com> <br>
<b>Sent:</b> Thursday, July 13, 2023 10:20 AM<br>
<b>To:</b> Cea, Stephen M <stephen.m.cea@intel.com><br>
<b>Cc:</b> petsc-dev@mcs.anl.gov<br>
<b>Subject:</b> Re: [petsc-dev] Question about PETSc and pardiso<o:p></o:p></p>
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<p class="MsoNormal">On Thu, Jul 13, 2023 at 12:43 PM Cea, Stephen M <<a href="mailto:stephen.m.cea@intel.com">stephen.m.cea@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif"> I had a questions about PETSc and pardiso integration. Can you use any of the built into PETSc
matrix reordering routines with pardiso or just the built in options in pardiso? </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">Currently, you can only use the built-in reorderings.<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, it would be simple to extend. We already support using a user-supplied permutation<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> -mat_mkl_pardiso_5<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">but there is no interface for setting the "perm" array in the Pardiso struct. We could add an interface<o:p></o:p></p>
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<p class="MsoNormal">to take the IS from MatGetOrdering() and stick it into this array. Note that Pardiso only supports symmetric<o:p></o:p></p>
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<p class="MsoNormal">reorderings.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Thanks,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Matt<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif">Thanks!</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:12.0pt;font-family:"Intel Clear",sans-serif">steve</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"><span class="gmailsignatureprefix">-- </span><o:p></o:p></p>
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<p class="MsoNormal">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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><o:p></o:p></p>
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