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RE: Petsc + BlockSolve95


     No, MatSetOption() should always work and accept these arguments.
Are you sure the values of MAT_SYMMETRIC and MAT_SYMMETRY_ETERNAL
are being set (by including the right Fortran include file) before you
use them?

      Barry
BTW: is this PETSc 2.3.1?



On Wed, 10 May 2006, Boulahya Faïza wrote:

Thanks.

I tried something else :
   - creation of the matrix with MatCreateMPIAIJ
   - initialization
   - adding of the options MAT_SYMMETRIC and MAT_SYMMETRY_ETERNAL

When solving in sequential CG + ICC, everything is ok. When I tried in
parallel the same code the options lead to the same error :
[0]PETSC ERROR: MatSetOption_MPIAIJ() line 1251 in
src/mat/impls/aij/mpi/mpiaij.c
[0]PETSC ERROR: No support for this operation for this object type!
[0]PETSC ERROR: unknown option!
[0]PETSC ERROR: MatSetOption() line 4137 in src/mat/interface/matrix.c

Can MatSetOption be only used in sequential?


Faïza


 _____

De : Matthew Knepley [mailto:knepley@xxxxxxxxx]
Envoyé : mardi 9 mai 2006 18:19
À : petsc-users@xxxxxxxxxxx
Objet : Re: Petsc + BlockSolve95


I believe there is a problem with the option that you specified. All these
are integers, and it is complaining that the integer does not match
MAT_SYMMETRIC. I will fix the error message to print the offending
option, but please check the code.

 Thanks,

    Matt


On 5/9/06, Boulahya Faïza <F.Boulahya@xxxxxxx <mailto:F.Boulahya@xxxxxxx> >
wrote:

Hi All,

Has anyone used Conjugate Gradient Solver + Icomplete Cholesky
Preconditionner in parallel case? I tried as said in the manual : I use
MATMPIROWBS for the storage of the matrice. However I get this message :

PETSC ERROR: To use incomplete Cholesky
                       preconditioning with a MATMPIROWBS matrix you must
declare it to be
                       symmetric using the option
MatSetOption(A,MAT_SYMMETRIC)!


So I tried adding this option (even if in the namual it is written that it
is not required). Then I obtained this message
PETSC ERROR: MatSetOption_MPIRowbs() line 1411 in
src/mat/impls/rowbs/mpi/mpirowbs.c
PETSC ERROR: No support for this operation for this object type!
PETSC ERROR: unknown option!
PETSC ERROR: MatSetOption() line 4137 in src/mat/interface/matrix.c


In advance thanks,


Faïza


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