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See case '"-num_rhs" in petsc/src/ksp/ksp/tests/ex30.c</div>
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Hong</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> petsc-users <petsc-users-bounces@mcs.anl.gov> on behalf of Matthew Knepley <knepley@gmail.com><br>
<b>Sent:</b> Tuesday, August 4, 2020 7:29 PM<br>
<b>To:</b> Anthony Paul Haas <aph@email.arizona.edu><br>
<b>Cc:</b> petsc-users <petsc-users@mcs.anl.gov><br>
<b>Subject:</b> Re: [petsc-users] reuse Mumps factorization for multiple RHS</font>
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<div dir="ltr">On Tue, Aug 4, 2020 at 7:57 PM Anthony Paul Haas <<a href="mailto:aph@email.arizona.edu">aph@email.arizona.edu</a>> wrote:<br>
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<div dir="ltr">Hello,
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<div>When using Mumps to solve a linear system of equations (see below), can I reuse the factorization to solve for multiple RHS, ie, can I use <span style="color:rgb(74,0,255); font-family:Menlo; font-size:11px">KSPSolve</span> multiple times while only building
a different RHS in between the calls to <span style="color:rgb(74,0,255); font-family:Menlo; font-size:11px">KSPSolve</span>?</div>
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<div>Yes. It should detect that you have not changed the operator for the KSP and thus not refactor the matrix.</div>
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<div> Thanks,</div>
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<div> Matt</div>
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<div>Thanks,</div>
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<div>Anthony</div>
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<div><span style="font-family:Menlo; font-size:11px; font-variant-ligatures:no-common-ligatures; color:rgb(194,0,255)">call</span><span style="color:rgb(0,0,0); font-family:Menlo; font-size:11px; font-variant-ligatures:no-common-ligatures">
</span><span style="font-family:Menlo; font-size:11px; font-variant-ligatures:no-common-ligatures; color:rgb(74,0,255)">KSPSetType</span><span style="color:rgb(0,0,0); font-family:Menlo; font-size:11px; font-variant-ligatures:no-common-ligatures">(self%ksp,KSPPREONLY,self%ierr_ps)</span><br>
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<span style="font-variant-ligatures:no-common-ligatures; color:rgb(194,0,255)">call</span><span style="font-variant-ligatures:no-common-ligatures">
</span><span style="font-variant-ligatures:no-common-ligatures; color:rgb(74,0,255)">KSPGetPC</span><span style="font-variant-ligatures:no-common-ligatures">(self%ksp,pc,self%ierr_ps)</span></p>
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<span style="font-variant-ligatures:no-common-ligatures; color:rgb(194,0,255)">call</span><span style="font-variant-ligatures:no-common-ligatures">
</span><span style="font-variant-ligatures:no-common-ligatures; color:rgb(74,0,255)">PCSetType</span><span style="font-variant-ligatures:no-common-ligatures">(pc,PCLU,self%ierr_ps)</span></p>
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<span style="font-variant-ligatures:no-common-ligatures; color:rgb(194,0,255)">call</span><span style="font-variant-ligatures:no-common-ligatures">
</span><span style="font-variant-ligatures:no-common-ligatures; color:rgb(74,0,255)">PCFactorSetMatSolverPackage</span><span style="font-variant-ligatures:no-common-ligatures">(pc,MATSOLVERMUMPS,self%ierr_ps)</span></p>
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<span style="font-variant-ligatures:no-common-ligatures; color:rgb(194,0,255)">call</span><span style="font-variant-ligatures:no-common-ligatures; color:rgb(0,0,0)">
</span><span style="font-variant-ligatures:no-common-ligatures">PCFactorSetUpMatSolverPackage</span><span style="font-variant-ligatures:no-common-ligatures; color:rgb(0,0,0)">(pc,self%ierr_ps)</span></p>
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-- <br>
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<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>
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<div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
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