[petsc-users] Recommended solver and preconditioner to solve Poisson eqn on win7

[Jed Brown]

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>