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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks, Matt.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes, I have checked the returned values from x obtained from<o:p></o:p></span></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatSolve(F,b,x)<o:p></o:p></span></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> The norm error check for x is complete for N=75, 2028.</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Good point, Matt. Here is the complete message for Rank 391. The others are similar to this one.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: ------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Caught signal number 11 SEGV: Segmentation Violation, probably memory access out of range<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Try option -start_in_debugger or -on_error_attach_debugger<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: or see http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[391]PETSC ERROR: or try http://valgrind.org on
GNU/linux and Apple Mac OS X to find memory corruption errors<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: likely location of problem given in stack below<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: --------------------- Stack Frames ------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Note: The EXACT line numbers in the stack are not available,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: INSTEAD the line number of the start of the function<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: is given.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: [391] MatLUFactorNumeric_SuperLU_DIST line 284 /nfs/06/com0488/programs/libraries/PETSc/petsc-3.3-p2/src/mat/impls/aij/mpi/superlu_dist/superlu_dist.c<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: [391] MatLUFactorNumeric line 2778 /nfs/06/com0488/programs/libraries/PETSc/petsc-3.3-p2/src/mat/interface/matrix.c<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: --------------------- Error Message ------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Signal received!<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: ------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Petsc Release Version 3.3.0, Patch 2, Fri Jul 13 15:42:00 CDT 2012<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: See docs/changes/index.html for recent updates.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: See docs/faq.html for hints about trouble shooting.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: See docs/index.html for manual pages.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: ------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: /nfs/06/com0488/programs/examples/ZSOL0.2431/ZSOL on a arch-linu named n0272.ten.osc.edu by com0488 Sun Aug 12 23:18:07
2012<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Libraries linked from /nfs/06/com0488/programs/libraries/PETSc/petsc-3.3-p2/arch-linux2-cxx-debug/lib<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Configure run at Fri Aug 3 17:44:00 2012<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: Configure options --with-blas-lib=/nfs/06/com0488/programs/libraries/ScaLAPACK/2.0.1/lib/librefblas.a --with-lapack-lib=/nfs/06/com0488/programs/libraries/ScaLAPACK/2.0.1/lib/libreflapack.a
--download-blacs --download-scalapack --with-mpi-dir=/usr/local/mvapich2/1.7-gnu --with-mpiexec=/usr/local/bin/mpiexec --with-scalar-type=complex --with-precision=double --with-clanguage=cxx --with-fortran-kernels=generic --download-mumps --download-superlu_dist
--download-parmetis --download-metis --with-fortran-interfaces[391]PETSC ERROR: ------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[391]PETSC ERROR: User provided function() line 0 in unknown directory unknown file<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[cli_391]: aborting job:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">application called MPI_Abort(MPI_COMM_WORLD, 59) - process 391<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> petsc-users-bounces@mcs.anl.gov [mailto:petsc-users-bounces@mcs.anl.gov]
<b>On Behalf Of </b>Matthew Knepley<br>
<b>Sent:</b> Tuesday, August 14, 2012 3:34 PM<br>
<b>To:</b> PETSc users list<br>
<b>Subject:</b> Re: [petsc-users] Strange behavior of MatLUFactorNumeric()<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On Tue, Aug 14, 2012 at 5:26 PM, Jinquan Zhong <<a href="mailto:jzhong@scsolutions.com" target="_blank">jzhong@scsolutions.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear PETSc folks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I have a strange observation on using MatLUFactorNumeric() for dense matrices at different order
N. Here is the situation I have:</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">1.</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I use ./src/mat/tests/ex137.c as an example to direct PETSc in selecting superLU-dist and mumps. The calling sequence is
</span><o:p></o:p></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatGetOrdering(A,…)</span><o:p></o:p></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatGetFactor(A,…)</span><o:p></o:p></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatLUFactorSymbolic(F, A,…)</span><o:p></o:p></p>
<p style="margin-left:1.0in"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatLUFactorNumeric</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">(F, A,…)</span><o:p></o:p></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">MatSolve(F,b,x)</span><o:p></o:p></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">2.</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I have three dense matrices A at three different dimensions: N=75, 2028 and 21180.
</span><o:p></o:p></p>
<p><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">3.</span><span style="font-size:7.0pt;color:#1F497D">
</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The calling sequence works for N=75 and 2028. But when N=21180, the program hanged up when calling
<b>MatLUFactorNumeric</b>(…). Seemed to be a segmentation fault with the following error message:</span><o:p></o:p></p>
<p style="margin-left:1.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:1.0in">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[1]PETSC ERROR: --------------------- Error Message ------------------------------------</span><o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">[1]PETSC ERROR: Signal received!</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">ALWAYS send the entire error message. How can we tell anything from a small snippet?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Since you have [1], this was run in parallel, so you need 3rd party packages. But you do<o:p></o:p></p>
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<p class="MsoNormal">not seem to be checking return values. Check them to make sure those packages are installed<o:p></o:p></p>
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<p class="MsoNormal">correctly.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"> Matt<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Does anybody have similar experience on that?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks a lot!</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><span style="color:#888888"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jinquan</span><span style="color:#888888"><o:p></o:p></span></p>
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<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <br>
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></p>
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