<div dir="ltr"><div dir="ltr">On Wed, Dec 20, 2023 at 9:49 PM Shatanawi, Sawsan Muhammad via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg6596943672973964543">
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;color:rgb(0,0,0)">Hello Barry,<br>
<br>
Thank you a lot for your help, Now I am getting the attached error message.</span></div></div></div></blockquote><div><br></div><div>Do not destroy the PC from KSPGetPC()</div><div><br></div><div> THanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg6596943672973964543"><div dir="ltr">
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;color:rgb(0,0,0)">Bests,<br>
Sawsan</span></div>
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<div id="m_6596943672973964543divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Barry Smith <<a href="mailto:bsmith@petsc.dev" target="_blank">bsmith@petsc.dev</a>><br>
<b>Sent:</b> Wednesday, December 20, 2023 6:32 PM<br>
<b>To:</b> Shatanawi, Sawsan Muhammad <<a href="mailto:sawsan.shatanawi@wsu.edu" target="_blank">sawsan.shatanawi@wsu.edu</a>><br>
<b>Cc:</b> Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>>; <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> Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code</font>
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Instead of
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<div> call PCCreate(PETSC_COMM_WORLD, pc, ierr)</div>
<div> call PCSetType(pc, PCILU,ierr) ! Choose a preconditioner type (ILU)</div>
<div> call KSPSetPC(ksp, pc,ierr) ! Associate the preconditioner with the KSP solver</div>
<div><br>
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<div>do</div>
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</div>
<div> call KSPGetPC(ksp,pc,ierr)</div>
<div> call PCSetType(pc, PCILU,ierr)</div>
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<div>Do not call KSPSetUp(). It will be taken care of automatically during the solve</div>
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<div>On Dec 20, 2023, at 8:52 PM, Shatanawi, Sawsan Muhammad via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>> wrote:</div>
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Hello, <br>
I don't think that I set preallocation values when I created the matrix, would you please have look at my code. It is just the petsc related part from my code.<br>
I was able to fix some of the error messages. Now I have a new set of error messages related to the KSP solver (attached)<br>
<br>
I appreciate your help</div>
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Sawsan</div>
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<font face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b><span> </span>Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>><br>
<b>Sent:</b><span> </span>Wednesday, December 20, 2023 6:44 AM<br>
<b>To:</b><span> </span>Shatanawi, Sawsan Muhammad <<a href="mailto:sawsan.shatanawi@wsu.edu" target="_blank">sawsan.shatanawi@wsu.edu</a>><br>
<b>Cc:</b><span> </span><a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a><span> </span><<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:</b><span> </span>Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code</font>
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<div dir="ltr">Did you set preallocation values when you created the matrix?
<div>Don't do that.</div>
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<div dir="ltr">On Wed, Dec 20, 2023 at 9:36 AM Shatanawi, Sawsan Muhammad <<a href="mailto:sawsan.shatanawi@wsu.edu" target="_blank">sawsan.shatanawi@wsu.edu</a>> wrote:<br>
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<div dir="ltr">Hello, </div>
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<div dir="ltr">I am trying to create a sparse matrix( which is as I believe a zero matrix) then adding some nonzero elements to it over a loop, then assembling it </div>
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<div id="m_6596943672973964543x_x_m_-677654408871201876divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b><span> </span>Mark Adams <<a href="mailto:mfadams@lbl.gov" target="_blank">mfadams@lbl.gov</a>><br>
<b>Sent:</b><span> </span>Wednesday, December 20, 2023 2:48 AM<br>
<b>To:</b><span> </span>Shatanawi, Sawsan Muhammad <<a href="mailto:sawsan.shatanawi@wsu.edu" target="_blank">sawsan.shatanawi@wsu.edu</a>><br>
<b>Cc:</b><span> </span><a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a><span> </span><<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>><br>
<b>Subject:</b><span> </span>Re: [petsc-users] Help with Integrating PETSc into Fortran Groundwater Flow Simulation Code
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<div dir="ltr">I am guessing that you are creating a matrix, adding to it, finalizing it ("assembly"), and then adding to it again, which is fine, but you are adding new non-zeros to the sparsity pattern.
<div>If this is what you want then you can tell the matrix to let you do that.</div>
<div>Otherwise you have a bug.</div>
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<div>Mark</div>
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<div dir="ltr">On Tue, Dec 19, 2023 at 9:50 PM Shatanawi, Sawsan Muhammad via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov" target="_blank">petsc-users@mcs.anl.gov</a>> wrote:<br>
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Hello everyone,
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<div>I hope this email finds you well.</div>
<div><span><br>
</span></div>
<div><span> My Name is Sawsan Shatanawi,</span><span><span style="display:inline;color:rgb(55,65,81)"> and I am currently working on developing a Fortran code for simulating groundwater flow in a 3D system. The code involves solving a nonlinear system, and
I have created the matrix to be solved using the PCG solver and Picard iteration. However, </span></span><span>when I tried to assign it as a PETSc matrix I started getting a lot of error messages.</span></div>
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<div>I am kindly asking if someone can help me,<span style="display:inline;color:rgb(55,65,81)"> I would be happy to share my code with him/her.</span></div>
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<div><span>Please find the attached file contains a list of errors I have gotten</span></div>
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<div><span style="color:rgb(55,65,81)">Thank you in advance for your time and assistance.</span><br>
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Best regards,</p>
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Sawsan</p>
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<span id="m_6596943672973964543x_cid:66357E60-6F0B-4E28-9883-5421A4F75577"><Matrix_RHS.F90></span><span id="m_6596943672973964543x_cid:FB95EDCC-3170-4E85-BBFB-5804756A9022"><out.txt></span><span id="m_6596943672973964543x_cid:8AF6D377-8CA5-4FFF-81AC-12EFB1837766"><solver.F90></span></div>
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</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><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><div><br></div><div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>