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Issue No. 08 - August (1997 vol. 8)
ISSN: 1045-9219
pp: 790-802
<p><b>Abstract</b>—Fault-tolerant systems aim at providing continuous operation in the presence of faults. Multicomputers rely on an interconnection network between processors to support the message-passing mechanism. Therefore, the reliability of the interconnection network is very important for the reliability of the whole system.</p><p>This paper analyzes the effective redundancy available in a wormhole network by combining connectivity and deadlock freedom. Redundancy is defined at the channel level. We propose a sufficient condition for channel redundancy, also computing the set of redundant channels. The redundancy level of the network is also defined, proposing a theorem that supplies its value. This theory is developed on top of our necessary and sufficient condition for deadlock-free adaptive routing. The new theory also considers the failure of physical channels when virtual channels are used. Finally, we propose a methodology for the design of fault-tolerant routing algorithms, showing its application to <it>n</it>-dimensional meshes.</p>
Adaptive routing, channel redundancy, fault-tolerant routing, interconnection networks, network redundancy, wormhole switching.

J. Duato, "A Theory of Fault-Tolerant Routing in Wormhole Networks," in IEEE Transactions on Parallel & Distributed Systems, vol. 8, no. , pp. 790-802, 1997.
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