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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Hi Matt and Hong,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Thank you for your response.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">I made the following changes, to get the desired output
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="p1"><span class="apple-converted-space"> </span><span class="s2">PetscReal</span><span class="s1"> norm;
</span>/* norm of solution error */<o:p></o:p></p>
<p class="p2"><span class="apple-converted-space"> </span><span class="s2">PetscInt</span><span class="apple-converted-space">
</span>its;<o:p></o:p></p>
<p class="p3"><span class="apple-converted-space"> </span>KSPConvergedReason<span class="s1"> reason;</span><o:p></o:p></p>
<p class="p3"><span class="apple-converted-space"> </span>PetscViewerAndFormat<span class="s1"> *vf;</span><o:p></o:p></p>
<p class="p4"><span class="apple-converted-space"> </span>PetscViewerAndFormatCreate<span class="s1">(</span><span class="s3">PETSC_VIEWER_STDOUT_WORLD</span><span class="s1">,
</span>PETSC_VIEWER_DEFAULT<span class="s1">, &vf);</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:#643820"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:#643820"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPView</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">(ksp, PETSC_VIEWER_STDOUT_SELF);CHKERRQ(ierr);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPSolve</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp, b, x);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPMonitorTrueResidual</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp,its,norm,vf);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPMonitorSingularValue</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp, its, norm, vf);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">I have attached the outputs from both the runs. As before, I am also printing A, b, and x.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">I wonder if it is a memory issue related to mpi library employed. I am currently using openmpi – should I instead use mpich?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Karthik.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Matthew Knepley <knepley@gmail.com><br>
<b>Date: </b>Thursday, 17 November 2022 at 12:19<br>
<b>To: </b>Zhang, Hong <hzhang@mcs.anl.gov><br>
<b>Cc: </b>petsc-users@mcs.anl.gov <petsc-users@mcs.anl.gov>, Chockalingam, Karthikeyan (STFC,DL,HC) <karthikeyan.chockalingam@stfc.ac.uk><br>
<b>Subject: </b>Re: [petsc-users] Different solution while running in parallel<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">On Wed, Nov 16, 2022 at 9:07 PM Zhang, Hong via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black;background:white">Karhik,</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black;background:white">Can you find out the condition number of your matrix?</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Also, run using<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> -ksp_view -ksp_monitor_true_residual -ksp_converged_reason<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">and send the two outputs.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> Matt<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black;background:white">Hong</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:11.0pt">
<hr size="0" width="99%" align="center">
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<div id="m_-7607706715142363214divRplyFwdMsg">
<p class="MsoNormal"><b><span style="font-size:11.0pt;color:black">From:</span></b><span style="font-size:11.0pt;color:black"> petsc-users <<a href="mailto:petsc-users-bounces@mcs.anl.gov" target="_blank">petsc-users-bounces@mcs.anl.gov</a>> on behalf of Karthikeyan
Chockalingam - STFC UKRI via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>><br>
<b>Sent:</b> Wednesday, November 16, 2022 6:04 PM<br>
<b>To:</b> <a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a> <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:</b> [petsc-users] Different solution while running in parallel</span><span style="font-size:11.0pt">
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt"> <o:p></o:p></span></p>
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<div>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> Hello,<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> I tried to solve a (FE discretized) Poisson equation using PCLU. For some reason I am getting different solutions while running the problem on one and two
cores. I have attached the output file (out.txt) from both the runs. I am printing A, b and x from both the runs – while A and b are the same but the solution seems is different.<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">I am not sure what I doing wrong.<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">Below is my matrix, vector, and solve setup.
<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> </span><span style="font-size:9.0pt;font-family:Menlo;color:#3900A0">Mat</span><span style="font-size:9.0pt;font-family:Menlo;color:black"> A;<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#3900A0">Vec</span><span style="font-size:9.0pt;font-family:Menlo;color:black"> b, x;</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> </span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">MatCreate</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">PETSC_COMM_WORLD</span><span style="font-size:9.0pt;font-family:Menlo;color:black">,
&A); </span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">MatSetType</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(A,
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">MATMPIAIJ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">);
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">MatSetSizes</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(A,
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">PETSC_DECIDE</span><span style="font-size:9.0pt;font-family:Menlo;color:black">,
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">PETSC_DECIDE</span><span style="font-size:9.0pt;font-family:Menlo;color:black">, N, N);
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">MatMPIAIJSetPreallocation</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(A,d_nz,
</span><b><span style="font-size:9.0pt;font-family:Menlo;color:#9B2393">NULL</span></b><span style="font-size:9.0pt;font-family:Menlo;color:black">, o_nz,
</span><b><span style="font-size:9.0pt;font-family:Menlo;color:#9B2393">NULL</span></b><span style="font-size:9.0pt;font-family:Menlo;color:black">);
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9"> ierr = MatSetOption(A,MAT_SYMMETRIC,PETSC_TRUE);
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">MatCreateVecs</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(A, &b, &x);
</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> <o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#3900A0">KSP</span><span style="font-size:9.0pt;font-family:Menlo;color:black"> ksp;<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#3900A0">PC</span><span style="font-size:9.0pt;font-family:Menlo;color:black"> pc;<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9"> KSPCreate(PETSC_COMM_WORLD, &ksp);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPSetOperators</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp, A, A);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPSetType</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp,</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">KSPPREONLY</span><span style="font-size:9.0pt;font-family:Menlo;color:black">);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPGetPC</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp,&pc);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> ierr =
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">PCSetType</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(pc,</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">PCLU</span><span style="font-size:9.0pt;font-family:Menlo;color:black">);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ierr);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9"> ierr = PCFactorSetMatSolverType(pc,</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">MATSOLVERMUMPS</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">);</span><span style="font-size:9.0pt;font-family:Menlo;color:#643820">CHKERRQ</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">(ierr);<o:p></o:p></span></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">
</span><span style="font-size:9.0pt;font-family:Menlo;color:#6C36A9">KSPSolve</span><span style="font-size:9.0pt;font-family:Menlo;color:black">(ksp, b, x);</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> </span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">Thank you for your help.</span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black"> </span><o:p></o:p></p>
<p style="margin:0cm;background:white"><span style="font-size:9.0pt;font-family:Menlo;color:black">Karhik.</span><o:p></o:p></p>
<p style="margin:0cm"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><br clear="all">
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">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></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><o:p></o:p></span></p>
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