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<div dir="ltr">David :<br>
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<div>Petsc does not support parallel LU. For dense matrix, you can use Elemental. See example</div>
<div>petsc/src/ksp/ksp/examples/tests/ex40.c<br>
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<div>Hong</div>
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<div>Hello,</div>
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<div>i was trying to solve a linear system with a MPIDENSE matrix. I did</div>
<div><span style="font-family:tahoma,sans-serif">PC pc;<br>
KSPGetPC(solver, &pc);<br>
PCSetType(pc, PCLU); <br>
KSPSetOperators(solver, a_petsc, a_petsc);</span></div>
<div>for some KSP solver and some Mat a_petsc. When i run the code sequentially (mpirun -n 1) it works, but once i start it in parallel it breaks with the error message</div>
<div><i>[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
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[0]PETSC ERROR: See <a href="http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html" target="_blank">
http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html</a> for possible LU and Cholesky solvers
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[0]PETSC ERROR: Could not locate a solver package. Perhaps you must ./configure with --download-<package>
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[0]PETSC ERROR: See <a href="http://www.mcs.anl.gov/petsc/documentation/faq.html" target="_blank">
http://www.mcs.anl.gov/petsc/documentation/faq.html</a> for trouble shooting.
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[0]PETSC ERROR: Petsc Release Version 3.9.3, unknown
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[0]PETSC ERROR: Unknown Name on a arch-linux2-c-debug named manjaroDesktop by david Tue Oct 2 16:47:10 2018
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[0]PETSC ERROR: Configure options --download-superlu_dist --download-parmetis --download-metis --download-ptscotch
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[0]PETSC ERROR: #1 MatGetFactor() line 4328 in /home/david/lib/petsc/src/mat/interface/matrix.c </i>
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<div>I recompiled petsc with the recommended options (and also trying some other options) but the error persists. on the linear solve table there is an X at the required solver package column for dense LU. What does it mean? On
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<div><a href="https://www.mcs.anl.gov/petsc/petsc-3.2/docs/linearsolvertable.html" target="_blank">https://www.mcs.anl.gov/petsc/petsc-3.2/docs/linearsolvertable.html</a></div>
<div>it says "PLAPACK". Did you deprecate it? What is the replacement?</div>
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<div>Thanks</div>
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<div>David Sommer<br>
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