Green multicore-SoC software-execution framework with timely-power-gating scheme

Masafumi Onouchi, Keisuke Toyama, Toru Nojiri, Makoto Sato, Masayoshi Mase, Jun Shirako, Mikiko Sato, Masashi Takada, Masayuki Ito, Hiroyuki Mizuno, Mitaro Namiki, Keiji Kimura, Hironori Kasahara

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

1 Citation (Scopus)

Abstract

We are developing a software-execution framework based on an octo-core chip multiprocessor named RP2 and an automatic multigrain-parallelizing compiler named OSCAR. The main purpose of this framework is to maintain good speed scalability and power efficiency over the number of processor cores under severe hardware restrictions for embedded use. Key to the speed scalability is reduction of a communication overhead with parallelized tasks. A data-categorization scheme enables small-overhead cache-coherency maintenance by using directives and instructions from the compiler. In this scheme, the number of cache-flushing time is minimized and parallelized tasks are quickly synchronized by using flags in local memory. As regards power efficiency, to reduce power consumption, power supply to processor cores waiting for other cores is timely and frequently cut off, even in the middle of an application, by using a timelypower- gating scheme. In this scheme, to achieve quick mode transition between "NORMAL" mode and "RESUME POWEROFF" mode, register values of the processor core are stored in core-local memory, which is active even in "RESUME POWEROFF" mode and can be accessed in one or two clock cycles. Measured speed and power of an application show good speed scalability in execution time and high power efficiency, simultaneously. In the case of a secure AAC-LC encoding program, execution speed when eight processor cores are used can be increased by 4.85 times compared to that of sequential execution. Moreover, power consumption under the same condition can be reduced by 51.0% by parallelizing and timely-power gating. The time for mode transition is less than 20 μsec, which is only 2.5% of the "RESUME POWER-OFF" period.

Original languageEnglish
Title of host publicationICPP-2009 - The 38th International Conference on Parallel Processing
Pages510-517
Number of pages8
DOIs
Publication statusPublished - 2009
Event38th International Conference on Parallel Processing, ICPP-2009 - Vienna, Austria
Duration: 2009 Sep 222009 Sep 25

Publication series

NameProceedings of the International Conference on Parallel Processing
ISSN (Print)0190-3918

Conference

Conference38th International Conference on Parallel Processing, ICPP-2009
CountryAustria
CityVienna
Period09/9/2209/9/25

ASJC Scopus subject areas

  • Software
  • Mathematics(all)
  • Hardware and Architecture

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