A parallel execution model of logic programs

  • Authors:
  • Shinji Umeyama;Koichiro Tamura

  • Affiliations:
  • -;-

  • Venue:
  • ISCA '83 Proceedings of the 10th annual international symposium on Computer architecture
  • Year:
  • 1983

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Abstract

A logic programming language offers several kinds of parallelism for its execution. Among these, this paper concentrates on OR-parallelism which is an alternative to the backtracking mechanism of a serial interpreter, and proposes an abstract model for OR-parallel interpretation. It consists of tokens and five kinds of function units mutually connected as a process graph. The overall processing is done by the flows of tokens among these units. We also present a mechanism for token labeling, which makes this process graph reentrant. A simulation result is given to show how efficiently the model works in terms of parallelism.