MPI (lack of) Performance?

Martin Konold
Mon May 10 22:41:32 1999

On Mon, 10 May 1999, Jonathan King wrote:

> performance.  My results (using the simple ping-pong MPI program at the
> bottom) inside of MPI are only order 23Mb/s.

Doing tcp/ip is expensive and not well suited to high performance MPI. We
measured for example about 24 MB/s with MPI over tcp/ip on Myrinet but 
95MB/s with the Score 0 copy implementation of ScoreMPI using the very
same hw. Similar numbers can be achieved with SCI.

Simply count the number of data copy operations and context switches.

-- martin

// Martin Konold, Herrenbergerstr. 14, 72070 Tuebingen, Germany  //
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