The Extra Connectivity, Extra Conditional Diagnosability, and $t/m$-Diagnosability of Arrangement Graphs

Extra connectivity is an important indicator of the robustness of a multiprocessor system in presence of failing processors. The g-extra conditional diagnosability and the t/m-diagnosability are two important diagnostic strategies at system-level that can significantly enhance the system's self-diagnosing capability. The g-extra conditional diagnosability is defined under the assumption that every component of the system removing a set of faulty vertices has more than g vertices. The t/m-diagnosis strategy can detect up to t faulty processors which might include at most m misdiagnosed processors, where m is typically a small integer number. In this paper, we analyze the combinatorial properties and fault tolerant ability for an (n, k)-arrangement graph, denoted by An,k, a well-known interconnection network proposed for multiprocessor systems. We first establish that the An,k's one-extra connectivity is (2k - 1) (n - k) - 1 (k ≥ 3, n ≥ k + 2), two-extra connectivity is (3k - 2)(n - k) - 3 (k ≥ 4, n ≥ k + 2), and three-extra connectivity is (4k - 4)(n - k) - 4 ( k ≥ 4, n ≥ k + 2 or k ≥ 3, n ≥ k + 3), respectively. And then, we address the g-extra conditional diagnosability of An,k under the PMC model for 1 ≤ g ≤ 3. Finally, we determine that the (n, k)-arrangement graph An,k is [(2k - 1)(n - k) - 1]/1-diagnosable (k ≥ 4, n ≥ k + 2), [(3k - 2)(n - k) - 3]/2-diagnosable (k ≥ 4, n ≥ k + 2), and [(4k - 4)(n - k) - 4]/3-diagnosable (k ≥ 4, n ≥ k + 3) under the PMC model, respectively.

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