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Home ยป Software Engagement with Sleeping CPUs
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Software Engagement with Sleeping CPUs

Monday, May 18, 2015 - 11:00am-11:30am
Authors: 

Qi Zhu, National University of Defense Technology, China; Meng Zhu, University of Rochester; Bo Wu, Colorado School of Mines; Xipeng Shen, North Carolina State University; Kai Shen, University of Rochester; Zhiying Wang, National University of Defense Technology, China

Abstract: 

Idle CPUs may enter power-saving hardware sleeps by, for instance, lowering the operating voltage and flushing the caches. However, wakeup delays that reach one hundred Secs or more are disrupting the operations of fast devices like solid-state disks and tightly integrated accelerators. On the other hand, maximal power savings on modern multicores are only realized through continuous, simultaneous CPU sleeps. We argue that strong software engagement (at the OS and applications) is needed to maximize the power saving while maintaining the desired performance. Specifically, we present anticipatory CPU wakeups for latency-sensitive operations on fast devices. We also explore power-saving sleep shaping opportunities through non-work-conserving scheduling on smartphones and staged bursts on servers.

Qi Zhu, National University of Defense Technology, China

Meng Zhu, University of Rochester

Bo Wu, Colorado School of Mines

Xipeng Shen, North Carolina State University

Kai Shen, University of Rochester

Zhiying Wang, National University of Defense Technology, China

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