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Issue No. 07 - July (1995 vol. 6)
ISSN: 1045-9219
pp: 704-713
<p><it>Abstract</it>—One of the essential problems in parallel computing is: Can SIMD machines handle asynchronous problems? This is a difficult, unsolved problem because of the mismatch between asynchronous problems and SIMD architectures. We propose a solution to let SIMD machines handle general asynchronous problems. Our approach is to implement a runtime support system which can run MIMD-like software on SIMD hardware. The runtime support system, named <it>P kernel</it>, is thread-based. There are two major advantages of the thread-based model. First, for application problems with irregular and/or unpredictable features, automatic scheduling can move some threads from overloaded processors to underloaded processors. Second, and more importantly, the granularity of threads can be controlled to reduce system overhead. The P kernel is also able to handle bookkeeping and message management, as well as to make these low-level tasks transparent to users. Substantial performance has been obtained on Maspar MP-1.</p>
SIMD parallel computers, portable programming environment, load balancing, thread model, scalability, irregular and dynamic applications.

M. Wu and W. Shu, "Asynchronous Problems on SIMD Parallel Computers," in IEEE Transactions on Parallel & Distributed Systems, vol. 6, no. , pp. 704-713, 1995.
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