Newsgroups: comp.parallel.mpi
From: gree9031@buzzard.csrv.uidaho.edu (Greenup Cade)
Subject: COW MPI Question
Organization: University of Idaho, Moscow, Idaho
Date: 5 Aug 1995 23:38:57 GMT
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Message-ID: <400veh$omk@newshound.uidaho.edu>


I've been working with a program that was converted from a Mas-Par (with 
a ton of processors) to MPI (LAM) on a HP COW.  The clusted only has about 8 
workstations in it.  The MPI program has over a hundred processes in it, 
thus each workstation will have about 10 of them running on it.  The 
question is when the processes within a workstation are exchanging data, 
do they still put the information out on the network, just as if the 
processes were on different nodes, or is MPI smart enough to keep the 
communication internal to that single processor?

I appreciate any answers and ideas anyone may have.  Thanks, Cade.

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