<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Tue, Oct 2, 2018 at 10:59 AM David Sommer <<a href="mailto:david97sommer@gmail.com">david97sommer@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Hello,</div><div><br></div><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 --------------------------------------------------------------                                                                           <br>[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                                                                   <br>[0]PETSC ERROR: Could not locate a solver package. Perhaps you must ./configure with --download-<package>                                                                                    <br>[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.                                                                                                <br>[0]PETSC ERROR: Petsc Release Version 3.9.3, unknown                                                                                                                                         <br>[0]PETSC ERROR: Unknown Name on a arch-linux2-c-debug named manjaroDesktop by david Tue Oct  2 16:47:10 2018                                                                                 <br>[0]PETSC ERROR: Configure options --download-superlu_dist --download-parmetis --download-metis --download-ptscotch                                                                           <br>[0]PETSC ERROR: #1 MatGetFactor() line 4328 in /home/david/lib/petsc/src/mat/interface/matrix.c     </i>                                                                                         <br></div><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 <br></div><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></div></div></div></div></blockquote><div><br></div><div>I do not see PLAPACK. You want Elemental.</div><div><br></div><div>  Thanks,</div><div><br></div><div>    Matt</div><div><br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Thanks</div><div><br></div><div>David Sommer<br></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature" data-smartmail="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>