On Sat, Sep 15, 2012 at 2:16 AM, TAY wee-beng <zonexo at gmail.com> wrote:
> I am using non-uniform Cartesian grid to solve. What do you mean by the > discretization? I 'm using finite volume method to obtain a system of > linear eqns. > Is it symmetric? Since you are using petsc-dev, you should pull the latest. Then if the error below persists, run in a debugger with -fp_trap to find what causes the floating point exception. > > I tried both -pc_type gamg and -pc_gamg_agg_nsmooths 1 but the solver > breaks down. The error msg is: > > *[0]PETSC ERROR: > ------------------------------------------------------------------------** > **[0]PETSC ERROR: Caught signal number 8 FPE: Floating Point > Exception,probably divide by zero** > **[0]PETSC ERROR: Try option -start_in_debugger or > -on_error_attach_debugger** > **[0]PETSC ERROR: or see > http://www.mcs.anl.gov/petsc/documentation/faq.html#valgrind[0]PETSC > ERROR: or try http://valgrind.org on GNU/linux and Apple Mac OS X to find > memory corruption errors** > **[0]PETSC ERROR: likely location of problem given in stack below** > **[0]PETSC ERROR: --------------------- Stack Frames > ------------------------------------** > **[0]PETSC ERROR: Note: The EXACT line numbers in the stack are not > available,** > **[0]PETSC ERROR: INSTEAD the line number of the start of the > function** > **[0]PETSC ERROR: is given.** > **[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues_GMRES line 24 > src/ksp/ksp/impls/gmres/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\impls\gmres\gmreig.c > ** > **[0]PETSC ERROR: [0] KSPComputeExtremeSingularValues line 40 > src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c > ** > **[0]PETSC ERROR: [0] PCGAMGOptprol_AGG line 1294 > src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\agg.c > ** > **[0]PETSC ERROR: [0] PCSetUp_GAMG line 559 > src/ksp/pc/impls/gamg/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\impls\gamg\gamg.c > ** > **[0]PETSC ERROR: [0] PCSetUp line 810 > src/ksp/pc/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\pc\INTERF~1\precon.c > ** > **[0]PETSC ERROR: [0] KSPSetUp line 182 > src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c > ** > **[0]PETSC ERROR: [0] KSPSolve line 351 > src/ksp/ksp/interface/C:\wtay\DOWNLO~1\Codes\PETSC-~1\src\ksp\ksp\INTERF~1\itfunc.c > ** > **[0]PETSC ERROR: --------------------- Error Message > ------------------------------------** > **[0]PETSC ERROR: Signal received!** > **[0]PETSC ERROR: > ------------------------------------------------------------------------** > **[0]PETSC ERROR: Petsc Development HG revision: > d560f272ff1b6e7f4e28667ab8b55f0c7408979e HG Date: Wed Jul 25 14:42:03 2012 > -0500** > **[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: > C:\Obj_tmp\ibm3d_high_Re_staggered_AB2\Debug\ibm3d_high_Re_staggered_AB2.exe > on a petsc-3.3 named USER-PC by User Sat Sep 15 09:12:58 2012** > **[0]PETSC ERROR: Libraries linked from > /cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008/lib** > **[0]PETSC ERROR: Configure run at Thu Jul 26 11:01:27 2012** > **[0]PETSC ERROR: Configure options --with-cc="win32fe cl" > --with-fc="win32fe ifort" --with-cxx="win32fe cl" > --with-mpi-dir=/cygdrive/c/MPICH2/ --download-f-blas-lapack=1 > --prefix=/cygdrive/d/wtay/Lib/petsc-3.3-dev_win32_vs2008 --with-debugging=1 > --useThreads=0** > **[0]PETSC ERROR: > ------------------------------------------------------------------------** > **[0]PETSC ERROR: User provided function() line 0 in unknown directory > unknown file** > **application called MPI_Abort(MPI_COMM_WORLD, 59) - process 0* > > Btw, I've used both GMRES and BCGS as the ksp. What other options can I > try? > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120915/223bbd33/attachment-0001.html>
