Correct and Almost Complete Diagnosis of Processor Grids

  • Authors:
  • Stefano Chessa;Piero Maestrini

  • Affiliations:
  • Univ. di Pisa corso Italia, Pisa, Italy;Univ. di Pisa corso Italia, Pisa, Italy

  • Venue:
  • IEEE Transactions on Computers
  • Year:
  • 2001

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Abstract

A new diagnosis algorithm for square grids is introduced. The algorithm always provides correct diagnosis if the number of faulty processors is below $T$, a bound with $T\in\Theta(n^{2/3})$, which was derived by worst-case analysis. A more effective tool to validate the diagnosis correctness is the syndrome dependent bound $T_\sigma$, with $T_\sigma\geq T$, asserted by the diagnosis algorithm itself for every given diagnosis experiment. Simulation studies provided evidence that the diagnosis is complete or almost complete if the number of faults is below $T$. The fraction of units which cannot be identified as either faulty or nonfaulty remains relatively small as long as the number of faults is below $n/3$ and, as long as the number of faults is below $n/2$, the diagnosis is correct with high probability.