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An Efficient Adaptive Deadlock-Free Routing Algorithm for Torus Networks

An Efficient Adaptive Deadlock-Free Routing Algorithm for To...

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第十四届全国容错计算学术会议(CFTC'2011)

作者： Wei Luo is with Hunan Electric Power Corporation Information Center, Changsha 410007,P.R.China.Dong Xiang is with the School of Software, Tsinghua University,Beijing 100084,P.R.China.

A deadlock-free minimal routing algorithm called clue is first presented for VCT(virtual cut-through)-switched tori. Only two queues(virtual channels) are *** channel is applied in the deadlock-free routing algorithm for the mesh sub-network based on a known base routing scheme,such as, negative-first or dimension-order *** other channel is similar to an adaptive *** combination completes a very novel fully-adaptive routing scheme because the first channel does not supply routing paths for every source-destination pair. Based on clue,we proposed two other algorithms named flow controlled clue and wormhole *** controlled clue is also proposed for VCT-switched *** is fully adaptive deadlock-free. Each input port requires at least two buffers,each of which is able to keep a packet.A simple but well-designed flow control function is used in the proposed flow controlled clue routing algorithm to avoid *** clue is proposed for wormhole-switched *** is partially adaptive because we add some constraints to the adaptive channel for deadlock avoidance. Simulation results show that:in VCT-switched tori,clue and flow controlled clue work better than the bubble flow control scheme under several popular traffic patterns in 2D and 3D *** a wormhole-switched tori,the advantage of wormhole clue over Duato’s protocol is also very *** the uniform traffic,the maximum normalized accepted traffic of wormhole clue is about 20%better than Duato’s protocol in 2D tori.

关键词： Index Terms-Virtual cut-through switching wormhole switching adaptive routing deadlock-free torus

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