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Fully adaptive routing algorithm has been widely used by modern commercial supercomputers due to its high path diversity. However, fully adaptive routing algorithm is prone to deadlock especially when wormhole switching with non-atomic virtual channel (VC) allocation is employed. Non-atomic VC allocation means that a VC can be immediately allocated once the tail flit of last packet arrives. Duato’s...
This paper proposes a new flow control scheme in VCT-switched irregular networks. Based on the new scheme, a novel deadlock-free fully adaptive routing algorithm is in-troduced. The algorithm does not need any virtual channel. It requires that each input port of a switch holds at least two 1-packet-sized buffers. The flow control scheme is proposed based on a baseline routing scheme, where the downstream...
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