MPIAIJ and MatSetValuesBlocked

[Ryan Yan]

Hi Barry,
My matrix is read from files stroing a matrix in the Block CRS format. So a
natural way to create the matrix is MPIBAIJ. However, if I want to
use MatSetValuesBlocked() for the newly created MPIBAIJ, I still need
to load a tempary arrary(from Block CRS file) with the length of blocksize^2
and pass it into the Matrix via MatSetValuesBlocked(). This process is
similar to the MatSetValues. Could you make a little bit more clarification
on why the MatSetValuesBlocked() have some advantage on blocked structure?

Thanks,

Yan



On Fri, May 1, 2009 at 6:12 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>  Support for MatSetValuesBlocked() for AIJ matrices was added in PETSc
> 3.0.0
>
>  Note that if your matrix is truly blocked you should use BAIJ matrices, if
> your matrix is not truly blocked then there is no benefit to using
> MatSetValuesBlocked() it was added so people could easily switch between AIJ
> and BAIJ for testing.
>
>   Barry
>
>
> On May 1, 2009, at 5:04 PM, Ryan Yan wrote:
>
> Hi, all,
>> I am using MPIAIJ for my matrix A, but when I call the function
>> MatSetValuesBlocked, I got the error:
>>
>> PetscPrintf(PETSC_COMM_WORLD, "breakpoint 1\n");
>>               ierr =
>> MatSetValuesBlocked(A,1,&irow,1,(col_ind+icol),temp_vector,INSERT_VALUES);
>>  PetscPrintf(PETSC_COMM_WORLD, "breakpoint 2\n");
>>
>>
>> breakpoint 1
>> [0]PETSC ERROR: --------------------- Error Message
>> ------------------------------------
>> [0]PETSC ERROR: No support for this operation for this object type!
>> [0]PETSC ERROR: Mat type mpiaij!
>> [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> [0]PETSC ERROR: Petsc Release Version 2.3.3, Patch 15, Tue Sep 23 10:02:49
>> CDT 2008 HG revision: 31306062cd1a6f6a2496fccb4878f485c9b91760
>> [0]PETSC ERROR: See docs/changes/index.html for recent updates.
>> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
>> [0]PETSC ERROR: See docs/index.html for manual pages.
>> [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> [0]PETSC ERROR:
>> /home/vyan2000/local/PPETSc/petsc-2.3.3-p15/src/ksp/ksp/examples/tutorials/ttt2/kspex1reader_binmpiaij
>> on a linux-gnu named vyan2000-linux by vyan2000 Fri May  1 17:58:48 2009
>> [0]PETSC ERROR: Libraries linked from
>> /home/vyan2000/local/PPETSc/petsc-2.3.3-p15/lib/linux-gnu-c-debug
>> [0]PETSC ERROR: Configure run at Thu Feb  5 21:10:10 2009
>> [0]PETSC ERROR: Configure options --with-mpi-dir=/usr/lib/
>> --with-debugger=gdb --with-shared=0 --download-hypre=1 --download-parmetis=1
>> [0]PETSC ERROR:
>> ------------------------------------------------------------------------
>> [0]PETSC ERROR: MatSetValuesBlocked() line 1289 in
>> src/mat/interface/matrix.c
>> breakpoint 2
>>
>> Is it the reason that  MatSetValuesBlocked only works for MPIBAIJ or
>> SeqBAIJ?
>>
>> Thanks,
>>
>> Yan
>>
>
>
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