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چکیده
In many parallel applications, network latency causes a dramatic loss in processor utilization. This paper examines software controlled access pipelining (SCAP) as a technique for hiding network latency. An analytic model of SCAP brieey describes basic operation techniques and performance improvements. Results are quantiied with benchmarks on the Cray-T3E. The benchmarks used are Jacobi-iteration, parts of the Livermore Loop kernels, and others representing six diierent parallel algorithm classes. These were par-allelized and optimized by hand to show the performance tradeoo of severals pipelining techniques. Our results show that SCAP on the Cray-T3E improves performance compared to a blocking execution by a factor of 2.1 to 38. It also got a performance speed-up against HPF of at least 12% to a factor of 3.1 dependent on the algorithm class.
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تاریخ انتشار 1997