[petsc-users] Use of superlu_dis

[w_ang_temp]

Hello,
    I have a problem about superlu_dis.
   The result of Ax=b is NaN. The error information is:
 
 ****** Warning from MC64A/AD. INFO(1) =  2
Linear solve converged due to CONVERGED_ITS iterations 1
[0]PETSC ERROR: --------------------- Error Message ------------------------------------
[0]PETSC ERROR: Floating point exception!
[0]PETSC ERROR: Infinite or not-a-number generated in norm!
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: ./ex4f on a arch-linu named node4 by wang Fri Jan  4 20:48:16 2013
[0]PETSC ERROR: Libraries linked from /public/soft/ddc/soft/petsc/petsc-3.2-p7/arch-linux2-c-opt/lib
[0]PETSC ERROR: Configure run at Tue Jan  1 22:23:45 2013
[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
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: VecNorm() line 167 in src/vec/vec/interface/rvector.c
 
 
    Does it mean that the matrix is singular? Or the size of the matrix (in the project, it is 250000X250000) is too large?
    Thanks.
                                                          Jim
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