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›› 2010, Vol. 27 ›› Issue (3): 404-413.DOI: 10.7523/j.issn.2095-6134.2010.3.015

• Research Articles • Previous Articles     Next Articles

Best energy-saving frequency in time-sharing system and its realization

MAO Yi-Lu, CHEN Xiang-Lan, TANG Ling, WU Hao, GONG Yu-Chang   

  1. School of Computer Science and Technology, University of Science and Technology of China, Hefei 230027, China; Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou 215123, China; Criminal Justice School, East China University of Political Science and Law, Shanghai 201620, China
  • Received:2009-09-08 Revised:2009-12-22 Online:2010-05-15

Abstract:

The problem of power and energy consumption is becoming increasingly important in computer systems, and this paper discusses this problem in time-sharing operating systems. We first give a formula to compute the best energy-saving frequency, which is deduced using the best energy-saving condition defined based on our description of system performance and energy. Because of the discrete nature of system frequencies, an algorithm is then proposed to approximate the best energy-saving frequency. We have implemented the proposed approach as a frequency management module in Linux, and experimental results show its correctness, efficiency, and practicability with an extremely low overhead of less than 3.63%.

Key words: time-sharing operating system, dynamic voltage and frequency scaling, low energy consumption, most energy-efficient frequency

CLC Number: