Petsc + BlockSolve95

[Hong Zhang]

>
>  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?

MatSetOption can be used for MPIAIJ matrix.

We do not have support for parallel icc, but it can used as
CG + BJACOBI + ICC.
The runtime option is
'-ksp_type cg -pc_type bjacobi -sub_pc_type icc'.

Hong

>
>
> Faïza
>
>
>   _____
>
> De : Matthew Knepley [mailto:knepley at gmail.com]
> Envoyé : mardi 9 mai 2006 18:19
> À : petsc-users at mcs.anl.gov
> 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 at brgm.fr <mailto:F.Boulahya at brgm.fr> >
> 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
>
>
> Pensez à visiter le site BRGM sur.... http://www.brgm.fr/
>
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