2017 IEEE 23rd International Conference on Parallel and Distributed Systems (ICPADS) (2017)
Shenzhen, Guangdong, China
Dec 15, 2017 to Dec 17, 2017
Recently proposed irregular networks can reduce the latency for both on-chip and off-chip systems with a large number of computing nodes and thus can improve the performance of parallel application. However, these networks usually suffer from deadlocks in routing packets when using a naive minimal path routing algorithm. To solve this problem, we focus attention on a lately proposed theory that generalizes the turn model to maintain the network performance with deadlock-freedom. The theorems remain a challenge of applying themselves to arbitrary topologies including fully irregular networks. In this paper, we advance the theorems to completely general ones. To apply the idea of the turn model to arbitrary topologies, we introduce a concept of regions that define continuous directions of channels on an n-dimensional space. Moreover, we provide a feasible implementation of a deadlock-free routing method based on our advanced theorem. To reduce the latency and the number of required Virtual Channels (VCs) with this method, a heuristic approach is introduced to reduce the number of prohibited turns between channels. Experimental results show that the routing method based on our proposed theorem can improve the network throughput by up to 138 % compared to a conventional deterministic minimal routing method. Moreover, it can reduce the latency by up to 2.9 % compared to another fully adaptive routing method.
telecommunication channels, telecommunication network routing, telecommunication network topology
R. Kawano, R. Yasudo, H. Matsutani, M. Koibuchi and H. Amano, "HiRy: An Advanced Theory on Design of Deadlock-Free Adaptive Routing for Arbitrary Topologies," 2017 IEEE 23rd International Conference on Parallel and Distributed Systems (ICPADS), Shenzhen, Guangdong, China, 2018, pp. 664-673.