BVF: Enabling significant on-chip power savings via bit-value-favor for throughput processors

Ang Li, Wenfeng Zhao, Shuaiwen Leon Song

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

5 Scopus citations

Abstract

Power reduction is one of the primary tasks for designing modern processors, especially for high-performance throughput processors such as GPU due to their high power budget. In this paper, we propose a novel circuit-architecture co-design scheme to harvest enormous power savings for GPU on-chip SRAM and interconnects. We propose a new 8T SRAM that exhibits asymmetric energy consumption for bit value 0/1, in terms of read, write and standby. We name this feature Bit-Value-Favor (BVF). To harvest the power benefits from BVF on GPUs, we propose three coding methods at architectural level to maximize the occurrence of bit-1s over bit-0s in the on-chip data and instruction streams, leading to substantial chip-level power reduction. Experimental results across a large spectrum of 58 representative GPU applications demonstrate that our proposed BVF design can bring an average of 21% and 24% chip power reduction under 28nm and 40nm process technologies, with negligible design overhead. Further sensitivity studies show that the effectiveness of our design is robust to DVFS, warp scheduling policies and different SRAM capacities.

Original languageEnglish (US)
Title of host publicationMICRO 2017 - 50th Annual IEEE/ACM International Symposium on Microarchitecture Proceedings
PublisherIEEE Computer Society
Pages532-545
Number of pages14
ISBN (Electronic)9781450349529
DOIs
StatePublished - Oct 14 2017
Event50th Annual IEEE/ACM International Symposium on Microarchitecture, MICRO 2017 - Cambridge, United States
Duration: Oct 14 2017Oct 18 2017

Publication series

NameProceedings of the Annual International Symposium on Microarchitecture, MICRO
VolumePart F131207
ISSN (Print)1072-4451

Other

Other50th Annual IEEE/ACM International Symposium on Microarchitecture, MICRO 2017
Country/TerritoryUnited States
CityCambridge
Period10/14/1710/18/17

Keywords

  • 6T
  • 8T
  • BVF
  • Bit
  • Bus
  • Decoder
  • Encoder
  • Energy
  • GPU
  • ISA
  • Power
  • SRAM
  • Toggle
  • Transistor
  • Value simiarity, Hamming

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