Abstract
Network-on-Chips (NoCs) has been widely used today for efficient communication in multicore systems. Existing NoCs mostly use 2D mesh topology in commercial and experimental manycore processors since it maps well to the 2D layout. For 2D mesh, dimension order routing and different adaptive routing algorithms performs well in unicast traffic but suffer from poor performance when faced with one-to-many (multicast) traffic. Efficient multicast routing algorithm is an important target for the design of special on-chip networks such as neural networks. Recently proposed multicast routing algorithms are less efficient or can introduce unbalanced load in some situations. In this paper, we propose DBM, a novel multicast routing algorithm based on the dimension-bubble flow control for 2D mesh networks. DBM is deadlock-free while achieving the minimal path and fully-adaptive multicast routing algorithm. Moreover, DBM simplifies the deadlock condition where the escape channel is not necessary. Evaluation results show that DBM can achieve much better performance than existing multicast routing algorithms, with 18% reduction in packet latency and 16% improvement in network throughput.
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Acknowledgment
We thank the anonymous reviewers for their valuable feedback. We gratefully acknowledge members of Tianhe interconnect group at NUDT for many inspiring conversations. This project was partially supported by the National Key R&D Program of China under Grant No. 2018YFB0204300, and in part by NSFC. 61802416 and School Research Project of National University of Defense Technology under grants No. ZK20-18.
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Xiao, C., Lou, H., Li, C., Jin, K. (2020). DBM: A Dimension-Bubble-Based Multicast Routing Algorithm for 2D Mesh Network-on-Chips. In: Dong, D., Gong, X., Li, C., Li, D., Wu, J. (eds) Advanced Computer Architecture. ACA 2020. Communications in Computer and Information Science, vol 1256. Springer, Singapore. https://doi.org/10.1007/978-981-15-8135-9_4
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DOI: https://doi.org/10.1007/978-981-15-8135-9_4
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