On Tue, Aug 14, 2012 at 5:26 PM, Jinquan Zhong <span dir="ltr"><<a href="mailto:jzhong@scsolutions.com" target="_blank">jzhong@scsolutions.com</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Dear PETSc folks,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><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:<u></u><u></u></span></p>
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<p><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span>1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><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
<u></u><u></u></span></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">MatGetOrdering(A,
)<u></u><u></u></span></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">MatGetFactor(A,
)<u></u><u></u></span></p>
<p style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">MatLUFactorSymbolic(F, A,
)<u></u><u></u></span></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,
)<u></u><u></u></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)<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span>2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><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.
<u></u><u></u></span></p>
<p><u></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><span>3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><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:<u></u><u></u></span></p>
<p style="margin-left:1.5in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">[1]PETSC ERROR: --------------------- Error Message ------------------------------------<u></u><u></u></span></p>
<p class="MsoNormal" style="margin-left:1.0in"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">[1]PETSC ERROR: Signal received!</span></p></div></div></div></blockquote>
<div><br></div><div>ALWAYS send the entire error message. How can we tell anything from a small snippet?</div><div><br></div><div>Since you have [1], this was run in parallel, so you need 3rd party packages. But you do</div>
<div>not seem to be checking return values. Check them to make sure those packages are installed</div><div>correctly.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Does anybody have similar experience on that?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Thanks a lot!<span class="HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></p><span class="HOEnZb"><font color="#888888">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Jinquan<u></u><u></u></span></p>
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</blockquote></div><br><br clear="all"><div><br></div>-- <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<br>