<div dir="ltr"><div>0. ALWAYS send the ENTIRE error message.</div><div><br></div>1. Use a --with-debugging=1 (the default) build, which will likely check earlier for NaN<br><br><div>2. Run in a debugger with -fp_trap.<br><br>
<div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jan 4, 2013 at 8:54 AM, w_ang_temp <span dir="ltr"><<a href="mailto:w_ang_temp@163.com" target="_blank">w_ang_temp@163.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="line-height:1.7;font-size:14px;font-family:arial"><div>Hello,</div>
<div> I have a problem about superlu_dis. </div>
<div> The result of Ax=b is NaN. The error information is:</div>
<div> </div>
<div> ****** Warning from MC64A/AD. INFO(1) = 2<br>Linear solve converged due to CONVERGED_ITS iterations 1<br>[0]PETSC ERROR: --------------------- Error Message ------------------------------------<br>[0]PETSC ERROR: Floating point exception!<br>
[0]PETSC ERROR: Infinite or not-a-number generated in norm!<br>[0]PETSC ERROR: ------------------------------------------------------------------------<br>[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012 <br>
[0]PETSC ERROR: See docs/changes/index.html for recent updates.<br>[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.<br>[0]PETSC ERROR: See docs/index.html for manual pages.<br>[0]PETSC ERROR: ------------------------------------------------------------------------<br>
[0]PETSC ERROR: ./ex4f on a arch-linu named node4 by wang Fri Jan 4 20:48:16 2013<br>[0]PETSC ERROR: Libraries linked from /public/soft/ddc/soft/petsc/petsc-3.2-p7/arch-linux2-c-opt/lib<br>[0]PETS
C ERROR: Configure run at Tue Jan 1 22:23:45 2013<br>[0]PETSC ERROR: Configure options --with-mpi-dir=/public/soft/ddc/soft/mpich2/ --download-f-blas-lapack=1 --download-hypre=1 --with-x=1 --with-debugging=0 --download-superlu_dist --download-parmetis --download-mumps --download-scalapack --download-blacs=/public/soft/ddc/soft/petsc/blacs-dev.tar.gz<br>
[0]PETSC ERROR: ------------------------------------------------------------------------<br>[0]PETSC ERROR: VecNorm() line 167 in src/vec/vec/interface/rvector.c</div>
<div> </div>
<div> </div>
<div> Does it mean that the matrix is singular? Or the size of the matrix (in the project, it is 250000X250000) is too large?</div>
<div> Thanks.</div>
<div> Jim</div></div><br><br><span title="neteasefooter"><span></span></span></blockquote></div><br></div></div></div>