MPI within SMP machines question

[Ron Chen]

It depends on your MPI library implementation. For Sun
MPI, if 2 processes are on the same machine, they will
communicate via shared memory.

I remember that there is a shared memory option for
MPICH, I forgot the details, please refer to the
documentation:

http://www-unix.mcs.anl.gov/mpi/mpich/docs.html

 -Ron


--- beowulf at hoolan.org wrote:
> 
> With MPI, messages are passing over network in
> typical beowulf
> environment. My question is, when src and dst are
> two processes
> running on the same machine, does it still
> communicate through
> network? or something smarter way like shared
> memory? or this
> is a feature I can explicitly enable? Thank you for
> your reply.
> 
> 
> Regards,
> Jeffrey Tang
> 
> 
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