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Program counter based techniques for dynamic power management

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3 Author(s)
C. Gniady ; Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA ; Y. C. Hu ; Y. -H. Lu

Reducing energy consumption has become one of the major challenges in designing future computing systems. We propose a novel idea of using program counters to predict I/O activities in the operating system. We present a complete design of program-counter access predictor (PCAP) that dynamically learns the access patterns of applications and predicts when an I/O device can be shut down to save energy. PCAP uses path-based correlation to observe a particular sequence of program counters leading to each idle period, and predicts future occurrences of that idle period. PCAP differs from previously proposed shutdown predictors in its ability to: (1) correlate I/O operations to particular behavior of the applications and users, (2) carry prediction information across multiple executions of the applications, and (3) attain better energy savings while incurring low mispredictions.

Published in:

Software, IEE Proceedings-

Date of Conference:

14-18 Feb. 2004