Fast computation using faulty hypercubes

  • Authors:
  • J. Hastad;T. Leighton

  • Affiliations:
  • Royal Institute of Technology, Stockholm SWEDEN;Math Dept. and Lab for Comp. Sci., MIT, Cambridge, MA

  • Venue:
  • STOC '89 Proceedings of the twenty-first annual ACM symposium on Theory of computing
  • Year:
  • 1989

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Abstract

We consider the computational power of a hypercube containing a potentially large number of randomly located faulty components. We describe a randomized algorithm which embeds an N-node hypercube in an N-node hypercube with faulty processors. Provided that the processors of the N-node hypercube are faulty with probability p N-node hypercube with faults can simulate T steps of an N-node fault-free hypercube in O(T) steps. The embedding is easy to construct in polylogarithmic time using only local control. We also describe O(log N)-step routing algorithms which ensure the delivery of messages with high probability even when a constant fraction of the nodes and edges have failed. The routing results represent the first adaptive routing algorithms for which an effective theoretical analysis has been achieved.