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Many-Core Token-Based Adaptive Power Gating

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4 Author(s)
Kahng, A.B. ; Univ. of California, San Diego, La Jolla, CA, USA ; Seokhyeong Kang ; Rosing, T.S. ; Strong, R.

Among power dissipation components, leakage power has become more dominant with each successive technology node. Leakage energy waste can be reduced by power gating. In this paper, we extend token-based adaptive power gating (TAP), a technique to power gate an actively executing core during memory accesses, to many-core Chip Multi-Processors (CMPs). TAP works by tracking every system memory request and its estimated time of arrival so that a core may power gate itself without performance or energy loss. Previous work on TAP [11] shows several benefits compared to earlier state-of-the-art techniques [10], including zero performance hit and 2.58 times average energy savings for out-of-order cores. We show that TAP can adapt to increasing memory contention by increasing power-gated time by 3.69 times compared to a low memory-pressure case. We also scale TAP to many-core architectures with a distributed wake-up controller that is capable of supporting staggered wake-ups and able to power gate each core for 99.07% of the time, achieved by a non-scalable centralized scheme.

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:32 ,  Issue: 8 )