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Wormhole routing is most commonly used in parallel architectures in which messages are sent in small fragments, called flits. It is a lightweight and efficient method of routing messages between parallel processors. Self-stabilization is a technique that guarantees tolerance to transient faults (e.g., memory corruption or communication hazards) for a given protocol. Self-stabilization guarantees that the network recovers to a correct behavior in a finite amount of time, without the need for human intervention. Self-stabilization also guarantees the safety property, meaning that once the network is in a legitimate state, it will remain there until another fault occurs. This paper presents the first self-stabilizing network algorithm in the wormhole routing model, using the unidirectional ring topology. Our solution benefits from wormhole routing by providing high throughput and low latency, and from self-stabilization by ensuring automatic resilience to all possible transient failures.

Keywords: distributed algorithms, fault-tolerance, self-stabilization, wormhole routing, interconnexion networks, virtual channels

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Received May 15, 2002; accepted July 25, 2002.
Communicated by Biing-Feng Wang, Stephan Olariu and Gen-Huey Chen.
^*A preliminary version of the paper was presented at the 2002 International Conference on Parallel and Distributed Systems, Chungli, Taiwan.