[petsc-dev] Question about DMCreateDomainDecomposition()

[Lulu Liu]

Hi,

I add the following lines in the example
/petsc/src/snes/examples/tutorials/ex19. When I run this example using
different numbers of processors, n always equals to 1. However, according
to the manual, n is the number of subproblems in the domain decomposition.
I feel confused why n does not return the number of processors, could
you explain it? Thanks!

 PetscInt n;
 DM *subdms;
 ierr
=DMCreateDomainDecomposition(da,&n,NULL,NULL,NULL,&subdms);CHKERRQ(ierr);
 PetscPrintf(PETSC_COMM_WORLD,"### n==%d\n", n);


Output:

### n==1

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