A Self-Stabilizing Ring Orientation Algorithm With a Smaller Number of Processor States

  • Authors:
  • Narutoshi Umemoto;Hirotsugu Kakugawa;Masafumi Yamashita

  • Affiliations:
  • Hi-Elecom-Kowa Co., Ltd., Hiroshima, Japan;Hiroshima Univ., Hiroshima, Japan;Hiroshima Univ., Hiroshima, Japan

  • Venue:
  • IEEE Transactions on Parallel and Distributed Systems
  • Year:
  • 1998

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Abstract

A distributed system is said to be self-stabilizing if it will eventually reach a legitimate system state regardless of its initial state. Because of this property, a self-stabilizing system is extremely robust against failures; it tolerates any finite number of transient failures. The ring orientation problem for a ring is the problem of all the processors agreeing on a common ring direction. This paper focuses on the problem of designing a deterministic self-stabilizing ring orientation system with a small number of processor states under the distributed daemon. Because of the impossibility of symmetry breaking, under the distributed daemon, no such systems exist when the number n of processors is even. Provided that n is odd, the best known upper bound on the number of states is 256 in the link-register model, and eight in the state-reading model. We improve the bound down to 63 = 216 in the link-register model.