An integration of imprecise computation model and real-time voltage and frequency scaling on responsive multithreaded processor

Keigo Mizotani, Yusuke Hatori, Yusuke Kumura, Masayoshi Takasu, Hiroyuki Chishiro, Nobuyuki Yamasaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

As microprocessor performance grows, high throughput and power management have been important on embedded real-time systems. Real-Time Voltage and Frequency Scaling (RT-VFS) has been proposed to reduce power consumption and ensure real-time constraints. An imprecise computation model adds an optional part to Liu and Layland’s model to improve the quality of computations. However, the trade-off between power consumption and quality of computations has not been well investigated on actual systems. This paper proposes the scheme to integrate an imprecise computation model and RT-VFS to improve the quality of computations and reduce the power consumption within real-time constraints. Moreover, we implement this scheme on Dependable Responsive Multithreaded Processor (D-RMTP), which is a prioritized simultaneous multithreaded processor for embedded real-time systems. We implement the proposed scheme by use of D-RMTP original features. Through experimental evaluation, we show that the proposed scheme satisfies both the lower energy consumption and higher quality of computations on actual systems. In particular, the proposed scheme achieves a maximum of 135% improvement of the quality of computations per energy consumption.

Original languageEnglish
Pages (from-to)128-136
Number of pages9
JournalInternational Journal of Computers and their Applications
Volume22
Issue number3
Publication statusPublished - 2015 Sep

Keywords

  • Embedded real-time systems
  • Imprecise computation model
  • Power consumption
  • Responsive multithreaded processor
  • RT-VFS

ASJC Scopus subject areas

  • Computer Science(all)

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