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Message-oriented parallel implementation of Moded Flat GHC

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Abstract

We proposed in Ref. 5) a new,message-oriented implementation technique for Moded Flat GHC that compiled unification for data transfer into message passing. The technique was based on constraint-based program analysis, and significantly improved the performance of programs that used goals and streams to implement reconfigurable data structures. In this paper we discuss how the technique can be parallelized. We focus on a method for shared-memory multiprocessors, called theshared-goal method, though a different method could be used for distributed-memory multiprocessors. Unlike other parallel implementations of concurrent logic languages which we callprocess-oriented, the unit of parallel execution is not an individual goal but a chain of message sends caused successively by an initial message send. Parallelism comes from the existence of different chains of message sends that can be executed independently or in a pipelined manner. Mutual exclusion based on busy waiting and on message buffering controls access to individual, shared goals. Typical goals allowlast-send optimization, the message-oriented counterpart of last-call optimization. We have built an experimental implementation on Sequent Symmetry. In spite of the simple scheduling currently adopted, preliminary evaluation shows good parallel speedup and good absolute performance for concurrent operations on binary process trees.

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References

  1. Chikayama, T. and Kimura, Y., “Multiple Reference Management in Flat GHC,” inProc. 4th Int. Conf. on Logic Programming, MIT Press, pp. 276–293, 1987.

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Author information

Authors and Affiliations

  1. Department of Information and Computer Science, Waseda University, 4-1, Ohkubo 3-chome, Shinjuku-ku, 169, Tokyo, Japan

    Kazunori Ueda

  2. Mitsubishi Research Institute, 3-6, Otemachi 2-chome, Chiyoda-ku, 100, Tokyo, Japan

    Masao Morita

Authors
  1. Kazunori Ueda
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  2. Masao Morita
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Additional information

Kazunori Ueda: He received the M. Eng. and Dr. Eng. degrees in information engineering from the University of Tokyo in 1980 and 1986, respectively. He joined NEC Corporation in 1983 and has engaged mainly in the design and implementation of concurrent logic programming languages ever since. From 1985 to 1992, he was with the Institute for New Generation Computer Technology on loan from NEC. Since 1993, he is an Associate Professor in the Department of Information and Computer Science at Waseda University. His current research interests include design and implementation of programming languages, logic programming, concurrency and parallelism, and knowledge information processing.

Masao Morita: He graduated from the electrical engineering course of Kobe Technical College in 1976. He has since worked on wide-ranging software, including on-line systems and CAD systems, at Mitsubishi Research Institute. Since 1986, he has been engaged in the research and development of concurrent logic language implementations as part of the Fifth Generation Computer Systems project. He also has interest in man-machine interface.

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Ueda, K., Morita, M. Message-oriented parallel implementation of Moded Flat GHC. New Gener Comput 11, 323–341 (1993). https://doi.org/10.1007/BF03037181

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  • DOI: https://doi.org/10.1007/BF03037181

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