ProjecToR: Agile reconfigurable data center interconnect

Monia Ghobadi, Ratul Mahajan, Amar Phanishayee, Nikhil Devanur, Janardhan Kulkarni, Gireeja Ranade, Pierre Alexandre Blanche, Houman Rastegarfar, Madeleine Glick, Daniel Kilper

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

135 Scopus citations

Abstract

We explore a novel, free-space optics based approach for building data center interconnects. It uses a digital micromirror device (DMD) and mirror assembly combination as a transmitter and a photodetector on top of the rack as a receiver (Figure 1). Our approach enables all pairs of racks to establish direct links, and we can reconfigure such links (i.e., connect different rack pairs) within 12 μs. To carry traffic from a source to a destination rack, transmitters and receivers in our interconnect can be dynamically linked in millions of ways. We develop topology construction and routing methods to exploit this flexibility, including a flow scheduling algorithm that is a constant factor approximation to the offline optimal solution. Experiments with a small prototype point to the feasibility of our approach. Simulations using realistic data center workloads show that, compared to the conventional folded-Clos interconnect, our approach can improve mean flow completion time by 30-95% and reduce cost by 25-40%.

Original languageEnglish (US)
Title of host publicationSIGCOMM 2016 - Proceedings of the 2016 ACM Conference on Special Interest Group on Data Communication
PublisherAssociation for Computing Machinery, Inc
Pages216-229
Number of pages14
ISBN (Electronic)9781450341936
DOIs
StatePublished - Aug 22 2016
Event2016 ACM Conference on Special Interest Group on Data Communication, SIGCOMM 2016 - Florianopolis, Brazil
Duration: Aug 22 2016Aug 26 2016

Publication series

NameSIGCOMM 2016 - Proceedings of the 2016 ACM Conference on Special Interest Group on Data Communication

Other

Other2016 ACM Conference on Special Interest Group on Data Communication, SIGCOMM 2016
CountryBrazil
CityFlorianopolis
Period8/22/168/26/16

Keywords

  • Data centers
  • Free-space optics
  • Reconfigurablility

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Communication
  • Computer Networks and Communications
  • Signal Processing

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