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It is difficult to separate the performance of an MPI implementation from the performance of the underlying hardware. Since this report is not about hardware (see [7] for information about hardware) performance is only a secondary issue. Also, it is not easy to give a complete picture of performance. For instance, latency and bandwidth numbers give only a small part of the overall picture. Therefore this review does not discuss absolute performance numbers.

Jack Dongarra
Sun Nov 9 14:03:51 EST 1997