[Beowulf] Shared memory

[Geoff Jacobs]

Jeff zhang wrote:

>Each node of my Beowulf cluster has two CPUs. The memory is shared
>between the two CPUs. How is MPI handling the memory in this
>situation? What is the most efficient way to program under this
>situation?
>Thanks.
>
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Using MPICH/p4, it's a network session. You have all the overhead of
your shells, but as far as the network stack is concerned, it's usually
a memcopy.

-- 
Geoffrey D. Jacobs
MORE CORE AVAILABLE, BUT NONE FOR YOU.