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In this paper, I presented the performance feature of workstation clusters with some problems from NAS Parallel benchmarks[1]. I presented that with switched and segmented Ethernet network, we can improve the performance drastically.

The PVM was easy to use API, but lack of non-blocking receive feature is major drawback. Though it support psend/precv function for higher performance, it is usually difficult for a program to issue precv prior to the corresponding psend. For further work, I am planning to port the programs to MPI plat-home and will use non-blocking communication features.

Naohiko Shimizu
Wed Feb 5 10:44:22 JST 1997