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From: smairal_at_[hidden]
Date: 2007-05-29 14:25:43


Hi,
     I am doing a research on parallel computing on shared memory with
NUMA architecture. The system is a 4 node AMD opteron with each node
being a dual-core. I am testing an OpenMPI program with MPI-nodes <=
MAX cores available on system (in my case 4*2=8). Can someone tell me
whether:
a) In such cases (where MPI-nodes<=MAX cores on shared-memory), OpenMPI
implements MPI-nodes as processes or threads? If yes, then how can it
be determined at run-time? I am wondering because processes have more
overhead than light-weight threads.

-Thanks and Regards,
Sarang.