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A Decision Procedure for Deadlock-Free Routing in Wormhole Networks

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2 Author(s)
Verbeek, F. ; Sch. of Comput. Sci., Open Univ. of The Netherlands, Heerlen, Netherlands ; Schmaltz, J.

Deadlock freedom is a key challenge in the design of communication networks. Wormhole switching is a popular switching technique, which is also prone to deadlocks. Deadlock analysis of routing functions is a manual and complex task. We propose an algorithm that automatically proves routing functions deadlock-free or outputs a minimal counter-example explaining the source of the deadlock. Our algorithm is the first to automatically check a necessary and sufficient condition for deadlock-free routing. We illustrate its efficiency in a complex adaptive routing function for torus topologies. Results are encouraging. Deciding deadlock freedom is co-NP-Complete for wormhole networks. Nevertheless, our tool proves a 13 × 13 torus deadlock-free within seconds. Finding minimal deadlocks is more difficult. Our tool needs four minutes to find a minimal deadlock in a 11 × 11 torus while it needs nine hours for a 12 × 12 network.

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Parallel and Distributed Systems, IEEE Transactions on  (Volume:25 ,  Issue: 8 )