Understanding power-performance relationship of energy-efficient modern DRAM devices

Sukhan Lee, Yuhwan Ro, Young Hoon Son, Hyunyoon Cho, Nam Sung Kim, Jung Ho Ahn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

As servers are equipped with more memory modules each with larger capacity, main-memory systems are now the second highest energy-consuming component in big-memory servers and their energy consumption even becomes comparable to processors in some servers. Meanwhile, it is critical for big-memory servers and their main-memory systems to offer high energy efficiency. Prior work exploited mobile LPDDR devices' advantages (lower power than DDR devices) while attempting to surmount their limitations (longer latency, lower bandwidth, or both). However, we demonstrate that such main memory architectures (based on the latest LPDDR4 devices) are no longer effective. This is because the power consumption of present DDR4 devices has substantially decreased by adopting the strength of mobile and graphics memory whereas LPDDR4 has sacrificed energy efficiency and focused more on increasing data transfer rates; we also exhibit that the power consumption of DDR4 devices can substantially vary across manufacturers. Moreover, investigating a new energy-saving feature of DDR4 devices in depth, we show that activating this feature often hurts overall energy efficiency of servers due to its performance penalties.

Original languageEnglish (US)
Title of host publicationProceedings of the 2017 IEEE International Symposium on Workload Characterization, IISWC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages110-111
Number of pages2
ISBN (Electronic)9781538612323
DOIs
StatePublished - Dec 5 2017
Event2017 IEEE International Symposium on Workload Characterization, IISWC 2017 - Seattle, United States
Duration: Oct 1 2017Oct 3 2017

Publication series

NameProceedings of the 2017 IEEE International Symposium on Workload Characterization, IISWC 2017
Volume2017-January

Other

Other2017 IEEE International Symposium on Workload Characterization, IISWC 2017
CountryUnited States
CitySeattle
Period10/1/1710/3/17

ASJC Scopus subject areas

  • Hardware and Architecture
  • Information Systems and Management

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