標題: | Maintaining Performance on Power Gating of Microprocessor Functional Units by Using a Predictive Pre-Wakeup Strategy |
作者: | Yeh, Chang-Ching Chang, Kuei-Chung Chen, Tien-Fu Yeh, Chingwei 資訊工程學系 Department of Computer Science |
關鍵字: | Design;Performance;Low power;leakage-power reduction;power gating |
公開日期: | 1-十月-2011 |
摘要: | Power gating is an effective technique for reducing leakage power in deep submicron CMOS technology. Microarchitectural techniques for power gating of functional units have been developed by detecting suitable idle regions and turning them off to reduce leakage energy consumption; however, wakeup of functional units is needed when instructions are ready for execution such that wakeup overhead is naturally incurred. This study presents time-based power gating with reference pre-wakeup (PGRP), a novel predictive strategy that detects suitable idle periods for power gating and then enables pre-wakeup of needed functional units for avoiding wakeup overhead. The key insight is that most wakeups are repeated due to program locality. Thus, the pre-wakeup predictor learns the wakeup events and selects which prior branch instruction can provide early wakeup (wakeup patterns are visible); these information are then used to adequately prepare available functional units for instruction execution. Simulation results with benchmarks from SPEC2000 applications show that substantial leakage energy reduction with negligible performance degradation (0.38% on average) is worthwhile. |
URI: | http://dx.doi.org/10.1145/2019608.2019615 http://hdl.handle.net/11536/14755 |
ISSN: | 1544-3566 |
DOI: | 10.1145/2019608.2019615 |
期刊: | ACM TRANSACTIONS ON ARCHITECTURE AND CODE OPTIMIZATION |
Volume: | 8 |
Issue: | 3 |
結束頁: | |
顯示於類別: | 期刊論文 |