PETSc communicator

[Barry Smith]

  Mat,

    This will not effect load balance or anything like that.

When you pass a communicator like  MPI_COMM_WORLD to PETSc
we don't actually use that communicator (because you might
be using it and there may be tag collisions etc). So instead
we store our own communicator inside the MPI_COMM_WORLD as an
attribute, this message is just telling us we are accessing
the inner communicator.

   Barry


On Thu, 17 Aug 2006, Matt Funk wrote:

> Hi,
>
> i was wondering what the message:
> 'PetscCommDuplicate Using internal PETSc communicator 92 170'
> means exactly. I still have issues with PETSc when running 1 vs 2 procs w.r.t.
> the loadbalance.
> However, when run on 2 vs 4 the balance seems to be almost perfect.
> Then the option of a screwed up network was suggested to me, but since the 4vs
> 2 proc case is ok, it seems not necessarily to be the case.
>
> Maybe somebody can tell me what it means?
>
> thanks
> mat
>
>