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Did you remember to set --bind-to-core or --bind-to-socket on the cmd line? Otherwise, the processes are running unbound, which makes a significant difference to performance.
On Jul 9, 2010, at 3:15 AM, Andreas Schäfer wrote:
> Maybe I should add that for tests I ran the benchmarks with two MPI
> processes: for InfiniBand one process per node and for shared memory
> both processes were located on one node.
> Andreas Schäfer
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