[petsc-users] KSPsolve Problem

[Matthew Knepley]

On Tue, Oct 14, 2014 at 2:07 PM, Sharp Stone <thronesf at gmail.com> wrote:

> Dear all,
>
> I'm trying to solve a linear system with petsc ksp solver. But after I
> called the kspsolve routine, I always got the "Vec entry at local location
> 0 is not-a-number or infinite at end of function" errors below. I checked
> the matrix and the vectors, and they are all numbers (and zeros). Is this a
> bug or I miss something? Thank you very much in advance!
>

Start simpler. Just use -pc_type lu -ksp_type gmres and see if you are
getting a believable solution. Then back off on the
PC and KSP.

  Matt


> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
>
> [0]PETSC ERROR: Floating point exception
>
> [0]PETSC ERROR: Vec entry at local location 0 is not-a-number or infinite
> at end of function: Parameter number 3
>
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
>
> [0]PETSC ERROR: Petsc Release Version 3.5.2, Sep, 08, 2014
>
> [0]PETSC ERROR: ./pStreamer on a arch-darwin-cxx-debug named
> host206-47.physci.fit.edu by GPL Tue Oct 14 14:58:05 2014
>
> [0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++
> --with-fc=gfortran --with-clanguage=cxx --download-fblaslapack
> --download-mpich
>
> [0]PETSC ERROR: #12 VecValidValues() line 34 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/vec/vec/interface/rvector.c
>
> [0]PETSC ERROR: #13 PCApply() line 442 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/pc/interface/precon.c
>
> [0]PETSC ERROR: #14 KSP_PCApply() line 230 in
> /Users/GPL/local/PETSc/petsc-3.5.2/include/petsc-private/kspimpl.h
>
> [0]PETSC ERROR: #15 KSPSolve_PREONLY() line 26 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/ksp/impls/preonly/preonly.c
>
> [0]PETSC ERROR: #16 KSPSolve() line 459 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/ksp/interface/itfunc.c
>
> [0]PETSC ERROR: #17 PCApply_BJacobi_Singleblock() line 675 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/pc/impls/bjacobi/bjacobi.c
>
> [0]PETSC ERROR: #18 PCApply() line 440 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/pc/interface/precon.c
>
> [0]PETSC ERROR: #19 KSP_PCApply() line 230 in
> /Users/GPL/local/PETSc/petsc-3.5.2/include/petsc-private/kspimpl.h
>
> [0]PETSC ERROR: #20 KSPInitialResidual() line 56 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/ksp/interface/itres.c
>
> [0]PETSC ERROR: #21 KSPSolve_BCGS() line 50 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/ksp/impls/bcgs/bcgs.c
>
> [0]PETSC ERROR: #22 KSPSolve() line 459 in
> /Users/GPL/local/PETSc/petsc-3.5.2/src/ksp/ksp/interface/itfunc.c
>
> --
> Best regards,
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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