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Home/Magazine Archive/May 1982 (Vol. 25, No. 5)/On an improved algorithm for decentralized extrema.../Abstract

On an improved algorithm for decentralized extrema finding in circular configurations of processors

By Randolph Franklin
Communications of the ACM, May 1982, Vol. 25 No. 5, Pages 336-337
10.1145/358506.358517
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This note presents a more efficient algorithm for finding the largest element in a circular list of processors when messages can be passed in either direction. It passes 2N*floor(lg N) + 3N messages in the worst case, compared to Chang and Roberts' N(N + 1)/2 and Hirschberg and Sinclair's 8N + 8*ceiling(N lg N) messages. The technique is a selective elimination of possible processes, which then merely relay future messages between the remaining contenders.

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