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      • Effectiveness of Power Gating for a Superscalar processor

        Tetsuya Muto,Kimiyoshi Usami 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7

        As the miniaturization of manufacturing process gets advanced, leakage power consumption quickly increases and becomes dominant in the total power consumption. Power Gating (PG) is a well-known technique that efficiently reduces leakage power. However effectiveness by applying PG to Functional units of a Superscalar processor has not been studied enough. In this paper, we investigated the effectiveness for a Superscalar processor assuming “2Way” and “4Way” by using a Simplescalar processor simulator with “pisa” architecture. Simulation results for programs in SPEC CPU 2000 and MiBench showed that applying PG to one ALU in four integer ALUs is effective in “4Way.” Effective sleep cycles that gives the net energy-savings occupy 63% in the total execution cycles on average. Applying PG to the integer Mult/Div also contributes to energy reduction. In “2Way,” only applying PG to the integer Mult/Div is effective.

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