Optimized core-links for low-latency NoCs

Ryuta Kawano, Seiichi Tade, Ikki Fujiwara, Hiroki Matsutani, Hideharu Amano, Michihiro Koibuchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In recent many-core architectures, the number of cores has been steadily increasing and thus the network latency between cores becomes an important issue for parallel application programs. Because packet-switched network structures are widely used for core-to-core communications, a topology among cores has a major impact on the network latency. It has been reported that a small-world Network-on-Chip that adds links between randomly-selected routers on a regular router topology is effective for reducing the network latency. In this study, we extend this framework by connecting multiple links between a single core and quasi-optimally selected neighboring routers to form multiple links from each core on a 2D MESH router topology. Results obtained by a flit-level discrete event simulator show that our optimized core-link topologies can achieve the average latency up to 48% lower than that of baseline topologies. Furthermore, full-system CMP simulation results show that by using optimized core-links we can improve the application execution time on the NAS Parallel Benchmarks by up to 10.1%.

Original languageEnglish
Title of host publicationProceedings - 23rd Euromicro International Conference on Parallel, Distributed, and Network-Based Processing, PDP 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages172-176
Number of pages5
ISBN (Print)9781479984909
DOIs
Publication statusPublished - 2015
Event23rd Euromicro International Conference on Parallel, Distributed, and Network-Based Processing, PDP 2015 - Turku, Finland
Duration: 2015 Mar 42015 Mar 6

Other

Other23rd Euromicro International Conference on Parallel, Distributed, and Network-Based Processing, PDP 2015
CountryFinland
CityTurku
Period15/3/415/3/6

ASJC Scopus subject areas

  • Hardware and Architecture
  • Computer Networks and Communications

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