Augmenting low-latency HPC network with free-space optical links

Ikki Fujiwara, Michihiro Koibuchi, Tomoya Ozaki, Hiroki Matsutani, Henri Casanova

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

17 Citations (Scopus)

Abstract

Various network topologies can be used for deploying High Performance Computing (HPC) clusters. The network topology, which connects switches In cabinets on a machine room floor, is typically defined once and for all at system deployment time. For a diverse application workload, there are downsides to having a single wired topology. In this work, we propose using free-space optics (FSO) in large-scale systems so that a diverse application workload can be better supported. A high-density layout of FSO terminals on top of the cabinets is determined that allows line-of-sight communication between arbitrary cabinet pairs. We first show that our proposal reduces both end-to-end network latency and total cable length when compared to a wired topology. We then demonstrate that the use of FSO links improves the embedding/partitioning capabilities of a wired topology. More specifically, we show that a recently proposed random low-latency topology can be augmented with a reasonable number of FSO links to support multiple k-ary n-cube and fat tree embedded topologies. Finally, we investigate power-aware on/off link regulation techniques and show how adding/reconfiguring FSO links leads to both performance and power efficiency improvements.

Original languageEnglish
Title of host publication2015 IEEE 21st International Symposium on High Performance Computer Architecture, HPCA 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages390-401
Number of pages12
ISBN (Print)9781479989300
DOIs
Publication statusPublished - 2015 Mar 6
Event2015 21st IEEE International Symposium on High Performance Computer Architecture, HPCA 2015 - Burlingame, United States
Duration: 2015 Feb 72015 Feb 11

Other

Other2015 21st IEEE International Symposium on High Performance Computer Architecture, HPCA 2015
CountryUnited States
CityBurlingame
Period15/2/715/2/11

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Hardware and Architecture
  • Software

Cite this

Fujiwara, I., Koibuchi, M., Ozaki, T., Matsutani, H., & Casanova, H. (2015). Augmenting low-latency HPC network with free-space optical links. In 2015 IEEE 21st International Symposium on High Performance Computer Architecture, HPCA 2015 (pp. 390-401). [7056049] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/HPCA.2015.7056049