Frequency–voltage cooperative CPU power control: A design rule and its application by feedback prediction
✍ Scribed by Keisuke Toyama; Satoshi Misaka; Kazuo Aisaka; Toshiyuki Aritsuka; Kunio Uchiyama; Koichiro Ishibashi; Hiroshi Kawaguchi; Takayasu Sakurai
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 780 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0882-1666
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✦ Synopsis
Abstract
Frequency–voltage cooperative power control (FVC) is a powerful method to reduce the CPU power consumption of a program during execution, because it utilizes the information on the software workload dynamically. In this paper, we first show through a mathematical analysis the design rule to determine the necessary frequencies and its effect. Then we show experimental results of implementing an FVC with a feedback algorithm on MPEG‐4 video and MP3 audio decoders with two sets of frequency and voltage. The FVC gave a 72% reduction in CPU power consumption during execution. In addition, we show a “Cool‐Start” method that begins the FVC at a lower frequency and improves the power reduction effect. © 2005 Wiley Periodicals, Inc. Syst Comp Jpn, 36(6): 39–48, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20263