On Apr 5, 2013, at 10:09 AM, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
>
> On Thu, Apr 4, 2013 at 7:42 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>
> It seems to me this is related to Moose's new MultiApp capability: solving
> different systems on subcommunicators (with the interaction between the
> systems handled outside of PETSc)? It may be that the cleaner approach is to
> have the subsystems (their solvers, rather) use prefixes to set their
> specific options.
> Would that be enough?
>
> Dmitry.
>
If PETSc is only aware of the subcommunicator then it could be that the
right model is to set PETSC_COMM_WORLD to be the sub comm of MPI_COMM_WORLD
before PetscInitialize(), then PETSc only sees that sub communicator. But you
will NOT be able to use PETSc on anything that "connects" these various sub
communicators together.
Barry
>
