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Sequential and Parallel Algorithms for Frontier A* with Delayed Duplicate Robert Niewiadomski

Summary: Sequential and Parallel Algorithms for Frontier A* with Delayed Duplicate
Robert Niewiadomski
and Jos┤e Nelson Amaral and Robert C. Holte
Department of Computing Science
University of Alberta
Edmonton, Alberta, T6G 2E8, Canada
Email: {niewiado, amaral, holte }@cs.ualberta.ca
We present sequential and parallel algorithms for Fron-
tier A* (FA*) algorithm augmented with a form of De-
layed Duplicate Detection (DDD). The sequential algo-
rithm, FA*-DDD, overcomes the leak-back problem as-
sociated with the combination of FA* and DDD. The
parallel algorithm, PFA*-DDD, is a parallel version of
FA*-DDD that features a novel workload distribution
strategy based on intervals. We outline an implementa-
tion of PFA*-DDD designed to run on a cluster of work-
stations. The implementation computes intervals at run-
time that are tailored to fit the workload at hand. Be-


Source: Amaral, JosÚ Nelson - Department of Computing Science, University of Alberta


Collections: Computer Technologies and Information Sciences