[petsc-users] MPI v. Pthreads ?

[John Chludzinski]

"If you don't have a real MPI installed"?

I installed (on Cygwin) using: ./configure CC=gcc FC=gfortran
--download-mpich=1 PETSC_ARCH=arch-cygwin-gnu

I've compiled some example MPI code using mpicc. And I've run the generated
executable with: mpiexec -n <some int> <executable>.

"ps" says it created n-number of processes.

But it is on a 2-proc/4-core Windows box running Cygwin (of course, not
configured as a cluster).

Do I have "real MPI" installed?

---John


On Sun, Jul 10, 2011 at 2:00 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> 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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