Comparing The Performance Of Mpi On The Cray Research T3e And Ibm Sp-2 1

This paper reports the performance of the Cray Research T3E and IBM SP-2 on a collection of communication tests that use MPI for the message passing. These tests have been designed to evaluate the performance of communication patterns that we feel are likely to occur in scientific programs. Communication tests were performed for messages of sizes 8 bytes, 1 KB, 100 KB, and 10 MB with 2, 4, 8, 16, 32 and 64 processors. Both machines provided a very high level of concurrency for the nearest neighbor communication tests and moderate concurrency on the broadcast operations. On the tests used, the T3E significantly outperformed the SP-2 with most performance tests being at least three times faster than the SP-2