SBAIJ + hypre preconditioners does not work?

Sh.M shma7099 at student.uu.se
Tue May 16 00:23:08 CDT 2006


Hi,

So far I have been using AIJ to construct my matrices and this has been due
to a legacy more than anything else.
However now I do need the extra memory as my problems are getting bigger and
bigger. So I have tried to use the
SBAIJ matrix format with block size = 1. My matrices are read from a file
and are symmetric but also "full" due to a legacy.
However as I understand I can treat the full matrix as if it was just the
upper triangle of it if I use command line
-mat_ignore_lower_triangular.

It has worked just fine when I for example use solver = CG and
preconditioner = Jacobi.
However I am getting some errors when using hypre preconditioners, for
exampel BoomerAMG.
I do know or atleast think by my own past experience with Hypre that
symmetric sparse matrix support has not been trivial in Hypre eventhough the
support was there. Can there be a case of PETSc + Hypre in combinaton simple
not supporting the SBAIJ matrix format?

I am getting this error message and I have tried with different matrices
ranging from 54x54 to 5Mx5M and 1-32 CPUs.

It crashes when it calls the solve function:

[0]PETSC ERROR: MatGetRow_SeqSBAIJ() line 207 in
src/mat/impls/sbaij/seq/sbaij.c
[0]PETSC ERROR: No support for this operation for this object type!
[0]PETSC ERROR: MatGetRow is not supported for SBAIJ matrix format. Getting
the upper trian\
gular part of row, run with -mat_getrow_uppertriangular, call
MatSetOption(mat,MAT_GETROW_U\
PPERTRIANGULAR) or MatGetRowUpperTriangular()!
[0]PETSC ERROR: MatGetRow_MPISBAIJ() line 1056 in
src/mat/impls/sbaij/mpi/mpisbaij.c
[0]PETSC ERROR: MatGetRow() line 168 in src/mat/interface/matrix.c
[0]PETSC ERROR: MatCholeskyCheckShift_inline() line 45 in
src/mat/impls/hypre/mhyp.c
[0]PETSC ERROR: PCSetUp_HYPRE() line 95 in src/ksp/pc/impls/hypre/hyppilut.c
[0]PETSC ERROR: PCSetUp() line 798 in src/ksp/pc/interface/precon.c
[0]PETSC ERROR: KSPSetUp() line 234 in src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: KSPSolve() line 334 in src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: User provided function() line 683 in petscSolver.c
[2509 MPI_COMM_WORLD 0] Process exited without calling MPI_Finalize.
Fatal error, aborting.

With best regards, Shaman Mahmoudi




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