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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 22 — Aug. 1, 2009
  • pp: E13–E23

Reconfigurable and adaptive photonic networks for high-performance computing systems

Avinash Kodi and Ahmed Louri  »View Author Affiliations


Applied Optics, Vol. 48, Issue 22, pp. E13-E23 (2009)
http://dx.doi.org/10.1364/AO.48.000E13


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Abstract

As feature sizes decrease to the submicrometer regime and clock rates increase to the multigigahertz range, the limited bandwidth at higher bit rates and longer communication distances in electrical interconnects will create a major bandwidth imbalance in future high-performance computing (HPC) systems. We explore the application of an optoelectronic interconnect for the design of flexible, high-bandwidth, reconfigurable and adaptive interconnection architectures for chip-to-chip and board-to-board HPC systems. Reconfigurability is realized by interconnecting arrays of optical transmitters, and adaptivity is implemented by a dynamic bandwidth reallocation (DBR) technique that balances the load on each communication channel. We evaluate a DBR technique, the lockstep (LS) protocol, that monitors traffic intensities, reallocates bandwidth, and adapts to changes in communication patterns. We incorporate this DBR technique into a detailed discrete-event network simulator to evaluate the performance for uniform, nonuniform, and permutation communication patterns. Simulation results indicate that, without reconfiguration techniques being applied, optical based system architecture shows better performance than electrical interconnects for uniform and nonuniform patterns; with reconfiguration techniques being applied, the dynamically reconfigurable optoelectronic interconnect provides much better performance for all communication patterns. Based on the performance study, the reconfigured architecture shows 30 % 50 % increased throughput and 50 % 75 % reduced network latency compared with HPC electrical networks.

© 2009 Optical Society of America

OCIS Codes
(200.0200) Optics in computing : Optics in computing
(200.4650) Optics in computing : Optical interconnects

History
Original Manuscript: December 2, 2008
Revised Manuscript: April 17, 2009
Manuscript Accepted: April 26, 2009
Published: June 10, 2009

Citation
Avinash Kodi and Ahmed Louri, "Reconfigurable and adaptive photonic networks for high-performance computing systems," Appl. Opt. 48, E13-E23 (2009)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-48-22-E13

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