NDLI: Energy-aware data prefetching for multi-speed disks

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Energy-aware data prefetching for multi-speed disks

Content Provider	ACM Digital Library
Author	Son, Seung Woo Kandemir, Mahmut
Abstract	Power consumption of disk based storage systems is becoming an increasingly pressing issue for both commercial and scientific application domains. Prior work proposed several hardware based approaches to reducing disk power consumption by making use of techniques such as spinning down idle disks and rotating them at lower speeds than the maximum speed possible. While such techniques are certainly very important, it is also critical to consider the influence the software can exercise in shaping the power consumption behavior of disk-intensive application programs. Motivated by this, the main goal of this work is to study whether an optimizing compiler can be used for increasing the power benefits that could be obtained from multi-speed disks. Specifically, we propose and experimentally evaluate a compiler-directed energy-aware data prefetching scheme for scientific applications that process disk-resident data sets. This scheme automatically determines the prefetch distance for all disk access instructions, the disk speeds to be employed, and the associated disk layouts (striping parameters) in a unified setting. We implemented the proposed approach within an optimizing compiler framework and conducted experiments with several disk-intensive applications. Our experimental evaluation shows that the proposed approach brings significant reductions in disk energy consumption over a state-of-the-art software-based I/O prefetching mechanism that does not take into account energy consumption explicitly. Our results also show that the energy-aware prefetching scheme does not bring any extra performance penalties and the energy reductions achieved are consistent across a wide spectrum of values of the simulation parameters.
Starting Page	105
Ending Page	114
Page Count	10
File Format	PDF
ISBN	1595933026
DOI	10.1145/1128022.1128038
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2006-05-03
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Multi-speed disks Prefetching Low power Optimizing compiler
Content Type	Text
Resource Type	Article

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