RE: Petsc + BlockSolve95

Hello people,

I have exactly the same problem as Faiza...

In sequential it runs ok but in parallel not.

Greetings.

Guilherme

-----Original Message-----
From: owner-petsc-users@xxxxxxxxxxx [mailto:owner-petsc-users@xxxxxxxxxxx] On Behalf Of Boulahya Faïza
Sent: 10 May 2006 10:39
To: 'petsc-users@xxxxxxxxxxx'
Subject: RE: Petsc + BlockSolve95

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> 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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