Towards Energy-Proportional Optical Interconnects

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

Abstract

Photonic interconnects have emerged as the prime candidate technology for efficient networks on chip (NoCs). However, the high optical loss of nanophotonic components coupled with the low efficiency of laser sources result in exceedingly high laser power requirements. As optical interconnects stay on even during periods of system inactivity, most of this power is wasted. In this paper we propose ProLaser, a laser control mechanism that has been co-designed with the cache coherence protocol to turn the lasers off when not needed and turn them back on just-in-time when communication is imminent. Overall, ProLaser saves 49-88% of the laser power and closely tracks (within 2-6%) a perfect prediction scheme with full knowledge of future interconnect requests. Moreover, the power savings of ProLaser allow the cores to exploit a higher power budget and run faster, achieving speedups of 1.5-1.7x and 35-52% lower energy consumption.
Original languageEnglish (US)
Title of host publicationGreater Chicago Area Systems Research Workshop (GCASR)
StatePublished - 2015
Event4th Annual Greater Chicago Area Systems Research Workshop: GCASR 2015 - UIC Forum, Chicago, IL, United States
Duration: Apr 27 2015 → …
https://sites.google.com/site/gcasrworkshop/2015

Conference

Conference4th Annual Greater Chicago Area Systems Research Workshop
Abbreviated titleGCASR 2015
CountryUnited States
CityChicago, IL
Period4/27/15 → …
Internet address

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Optical interconnects
Lasers
Nanophotonics
Optical losses
High power lasers
Photonics
Light sources
Energy utilization
Communication

Cite this

Demir, Y., & Hardavellas, N. (2015). Towards Energy-Proportional Optical Interconnects. In Greater Chicago Area Systems Research Workshop (GCASR)
Demir, Yigit ; Hardavellas, Nikolaos. / Towards Energy-Proportional Optical Interconnects. Greater Chicago Area Systems Research Workshop (GCASR). 2015.
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title = "Towards Energy-Proportional Optical Interconnects",
abstract = "Photonic interconnects have emerged as the prime candidate technology for efficient networks on chip (NoCs). However, the high optical loss of nanophotonic components coupled with the low efficiency of laser sources result in exceedingly high laser power requirements. As optical interconnects stay on even during periods of system inactivity, most of this power is wasted. In this paper we propose ProLaser, a laser control mechanism that has been co-designed with the cache coherence protocol to turn the lasers off when not needed and turn them back on just-in-time when communication is imminent. Overall, ProLaser saves 49-88{\%} of the laser power and closely tracks (within 2-6{\%}) a perfect prediction scheme with full knowledge of future interconnect requests. Moreover, the power savings of ProLaser allow the cores to exploit a higher power budget and run faster, achieving speedups of 1.5-1.7x and 35-52{\%} lower energy consumption.",
author = "Yigit Demir and Nikolaos Hardavellas",
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year = "2015",
language = "English (US)",
booktitle = "Greater Chicago Area Systems Research Workshop (GCASR)",

}

Demir, Y & Hardavellas, N 2015, Towards Energy-Proportional Optical Interconnects. in Greater Chicago Area Systems Research Workshop (GCASR). 4th Annual Greater Chicago Area Systems Research Workshop, Chicago, IL, United States, 4/27/15.

Towards Energy-Proportional Optical Interconnects. / Demir, Yigit; Hardavellas, Nikolaos.

Greater Chicago Area Systems Research Workshop (GCASR). 2015.

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

TY - GEN

T1 - Towards Energy-Proportional Optical Interconnects

AU - Demir, Yigit

AU - Hardavellas, Nikolaos

N1 - http://users.eecs.northwestern.edu/~hardav/papers/2016-Optics-ProLaser-Demir.pdf

PY - 2015

Y1 - 2015

N2 - Photonic interconnects have emerged as the prime candidate technology for efficient networks on chip (NoCs). However, the high optical loss of nanophotonic components coupled with the low efficiency of laser sources result in exceedingly high laser power requirements. As optical interconnects stay on even during periods of system inactivity, most of this power is wasted. In this paper we propose ProLaser, a laser control mechanism that has been co-designed with the cache coherence protocol to turn the lasers off when not needed and turn them back on just-in-time when communication is imminent. Overall, ProLaser saves 49-88% of the laser power and closely tracks (within 2-6%) a perfect prediction scheme with full knowledge of future interconnect requests. Moreover, the power savings of ProLaser allow the cores to exploit a higher power budget and run faster, achieving speedups of 1.5-1.7x and 35-52% lower energy consumption.

AB - Photonic interconnects have emerged as the prime candidate technology for efficient networks on chip (NoCs). However, the high optical loss of nanophotonic components coupled with the low efficiency of laser sources result in exceedingly high laser power requirements. As optical interconnects stay on even during periods of system inactivity, most of this power is wasted. In this paper we propose ProLaser, a laser control mechanism that has been co-designed with the cache coherence protocol to turn the lasers off when not needed and turn them back on just-in-time when communication is imminent. Overall, ProLaser saves 49-88% of the laser power and closely tracks (within 2-6%) a perfect prediction scheme with full knowledge of future interconnect requests. Moreover, the power savings of ProLaser allow the cores to exploit a higher power budget and run faster, achieving speedups of 1.5-1.7x and 35-52% lower energy consumption.

M3 - Conference contribution

BT - Greater Chicago Area Systems Research Workshop (GCASR)

ER -

Demir Y, Hardavellas N. Towards Energy-Proportional Optical Interconnects. In Greater Chicago Area Systems Research Workshop (GCASR). 2015