[petsc-users] MPI v. Pthreads ?

[Jed Brown]

On Sun, Jul 10, 2011 at 12:57, John Chludzinski <jchludzinski at gmail.com>wrote:

> So if host the "new and improved" PETSc on a mult--proc/multi-core Linux
> workstation (or in my case, a mult--proc/multi-core Windows workstation
> running Cygwin), not configured as a cluster, I would be using pthreads and
> not MPI?


If it is a single machine, you would be able to use any combination from all
separate MPI processes to one process. MPI calls won't go away, all the
XXCreate() functions will still have the MPI_Comm argument. You'll be able
to use MPIUNI if you don't have a real MPI installed.
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