NDLI: MemScale:active low-power modes for main memory (SIGP, Vol. 46, Issue. 3)

Content Provider	ACM Digital Library
Author	Wenisch, Thomas F. Meisner, David Deng, Qingyuan Ramos, Luiz Bianchini, Ricardo
Abstract	Main memory is responsible for a large and increasing fraction of the energy consumed by servers. Prior work has focused on exploiting DRAM low-power states to conserve energy. However, these states require entire DRAM ranks to be idled, which is difficult to achieve even in lightly loaded servers. In this paper, we propose to conserve memory energy while improving its energy-proportionality by creating active low-power modes for it. Specifically, we propose MemScale, a scheme wherein we apply dynamic voltage and frequency scaling (DVFS) to the memory controller and dynamic frequency scaling (DFS) to the memory channels and DRAM devices. MemScale is guided by an operating system policy that determines the DVFS/DFS mode of the memory subsystem based on the current need for memory bandwidth, the potential energy savings, and the performance degradation that applications are willing to withstand. Our results demonstrate that MemScale reduces energy consumption significantly compared to modern memory energy management approaches. We conclude that the potential benefits of the MemScale mechanisms and policy more than compensate for their small hardware cost.
Starting Page	225
Ending Page	238
Page Count	14
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/1961296.1950392
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	46
Issue Number	3
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dynamic voltage and frequency scaling Energy conservation Memory subsystem
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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