On 19 Dec 2014, at 18:19, Lawrence Mitchell <[email protected]> wrote:
> ...
>
>>> Calling MatGetLocalSubMatrix results in an error:
>>>
>>> [0]PETSC ERROR: --------------------- Error Message
>>> --------------------------------------------------------------
>>> [0]PETSC ERROR: Petsc has generated inconsistent data
>>> [0]PETSC ERROR: Blocksize of localtoglobalmapping 1 must match that of
>>> layout 2
>>
>> Hmm, I'm concerned that this might not work right after some recent
>> changes to ISLocalToGlobalMapping. Can you reproduce this with some
>> code I can run?
...
Here's one that doesn't try to destroy sections that don't exist, and
endeavours to print block sizes of all the sub matrices. I expect to see (2,
2), (2, 1), (1, 2) and (1, 1) I think.
Cheers,
Lawrence
#include <petsc.h>
int main(int argc, char **argv)
{
PetscErrorCode ierr;
DM v;
DM p;
DM pack;
PetscInt rbs, cbs;
PetscInt srbs, scbs;
PetscInt i, j;
Mat mat;
Mat submat;
IS *ises;
MPI_Comm c;
PetscInitialize(&argc, &argv, NULL, NULL);
c = PETSC_COMM_WORLD;
ierr = DMDACreate1d(c, DM_BOUNDARY_NONE, 10, 2, 1, NULL, &v); CHKERRQ(ierr);
ierr = DMDACreate1d(c, DM_BOUNDARY_NONE, 10, 1, 1, NULL, &p); CHKERRQ(ierr);
ierr = DMSetFromOptions(v); CHKERRQ(ierr);
ierr = DMSetFromOptions(p); CHKERRQ(ierr);
ierr = DMCreateMatrix(v, &mat); CHKERRQ(ierr);
ierr = MatGetBlockSizes(mat, &rbs, &cbs); CHKERRQ(ierr);
ierr = PetscPrintf(c, "Global Mat block size (%d, %d)\n", rbs, cbs);
CHKERRQ(ierr);
ierr = MatDestroy(&mat); CHKERRQ(ierr);
ierr = DMCompositeCreate(c, &pack); CHKERRQ(ierr);
ierr = DMCompositeAddDM(pack, v); CHKERRQ(ierr);
ierr = DMCompositeAddDM(pack, p); CHKERRQ(ierr);
ierr = DMSetFromOptions(pack); CHKERRQ(ierr);
ierr = DMCompositeGetLocalISs(pack, &ises); CHKERRQ(ierr);
ierr = DMCreateMatrix(pack, &mat); CHKERRQ(ierr);
ierr = MatGetBlockSizes(mat, &rbs, &cbs); CHKERRQ(ierr);
ierr = PetscPrintf(c, "Global Mat block size (%d, %d)\n", rbs, cbs);
CHKERRQ(ierr);
for (i=0; i < 2; i++ ) {
for (j=0; j < 2; j++ ) {
ierr = MatGetLocalSubMatrix(mat, ises[i], ises[j], &submat);
CHKERRQ(ierr);
ierr = MatGetBlockSizes(submat, &srbs, &scbs); CHKERRQ(ierr);
ierr = PetscPrintf(c, "Local (%d, %d) block has block size (%d,
%d)\n", i, j, srbs, scbs); CHKERRQ(ierr);
ierr = MatDestroy(&submat); CHKERRQ(ierr);
}
}
ierr = MatDestroy(&mat); CHKERRQ(ierr);
ierr = DMDestroy(&pack); CHKERRQ(ierr);
ierr = DMDestroy(&v); CHKERRQ(ierr);
ierr = DMDestroy(&p); CHKERRQ(ierr);
ierr = ISDestroy(&(ises[0])); CHKERRQ(ierr);
ierr = ISDestroy(&(ises[1])); CHKERRQ(ierr);
ierr = PetscFree(ises); CHKERRQ(ierr);
PetscFinalize();
return 0;
}
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