To confirm, are you casting A to PetscObject? e.g.
MPI_Comm comm;
/* ... */
PetscObjectGetComm((PetscObject)A,&comm);
Am Mi., 22. Apr. 2020 um 07:11 Uhr schrieb Marius Buerkle <[email protected]>:
> Hi,
>
> What is PetscObjectGetComm expected to return? I thought it would give the
> MPI communicator the object lives on. So if I create A matrix on
> PETSC_COMM_WORLD a call of PetscObjectGetComm for A it would return
> PETSC_COMM_WORLD? But it seems to return something else, and while most of
> the nodes return a similar communicator some are giving a different one.
> That said, is there a way to get the MPI communicator a matrix lives on?
>
> Best,
> Marius
>
