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Journals ACM SIGMETRICS Performance Evaluation Review Volume 19 Issue 1

In this paper, we present an analytical model for computing the dependability of hypercube systems. The model, referred to as task-based dependability (TBD), is developed under the assumption that a task needs at least an m -cube ( m < n ) in an n-cube for its execution. Two probabilistic terms are required for computing this dependability. The first is the probability of any x nodes working out of 2 n nodes. The second term is a conditional probability that at least a connected m-cube exists among those x working nodes. This term is computed using a recursive expression. Two dependability measures, reliability and availability, are analyzed in this paper. A combinatorial enumeration is used in the reliability analysis, and a machine repairman model is used in the availability analysis to find the first probability. The machine repairman model is modified to capture imperfect coverage and imprecise repair. The TBD model is also extended to find multitask dependability. Numerical results are presented for n-cubes with different task requirements and are validated through extensive simulation. It is observed that an m-cube requirement is highly restrictive compared to the simple 2 m -connected node requirement.

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On subcube dependability in a hypercube

Kim, Jong; Das, Chita R.
ACM SIGMETRICS Performance Evaluation Review , Volume 19 (1)
Association for Computing Machinery – Jun 2, 1991

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