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The Computer Journal 1996 39(9):780-792; doi:10.1093/comjnl/39.9.780
© 1996 by British Computer Society
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The Multipath Architecture for Prolog Programs

J. Tubella *, A. González * and E. Elias *

Polytechnic University of Catalunya, Department of Computer Architecture, 08034 Barcelona, Spain

This paper presents a novel architectural model that implements the Multipath execution model of Prolog programs. Multipath performs a partial breadth-first traversal of SLD trees, which is shown to be more efficient than the standard depth-first traversal for most of the benchmarks. Its advantages can be exploited in either a sequential or a parallel implementation. In a sequential execution, Multipath reduces the number of operations by traversing more than one search path in a single control flow. Moreover, in the context of a parallel environment, Multipath exploits path parallelism, a particular case of data parallelism when exploring search trees. We present performance figures of a sequential implementation and we measure the amount of parallelism exhibited by the execution model that could be exploited by a parallel implementation.

Received May 9, 1996. revised February 6, 1997.

* Polytechnic University of Catalunya, Department of Computer Architecture, 08034 Barcelona, Spain Email: jordit{at}ac.upc.es


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