NDLI: Collaborative operating system and compiler power management for real-time applications

Content Provider	IEEE Xplore Digital Library
Author	AbouGhazaleh, N. Mosse, D. Childers, B. Melhem, R. Craven, M.
Copyright Year	2003
Description	Author affiliation: Dept. of Comput. Sci., Pittsburgh Univ., PA, USA (AbouGhazaleh, N.; Mosse, D.; Childers, B.; Melhem, R.; Craven, M.)
Abstract	Managing energy consumption has become vitally important to battery operated portable and embedded systems. A dynamic voltage scaling (DVS) technique reduces the processor's dynamic power consumption quadratically at the expense of linearly decreasing the performance. Reducing energy using DVS in the context of real-time systems should consider this tradeoff. In this paper we introduce a novel collaborative approach between the compiler and the operating system (OS) that uses fine-grained information about the execution times of a real-time application to reduce energy consumption. We use the compiler to annotate an application's source code with path-dependent information called power management hints (PMHs). This information captures the temporal behavior of the application, which varies by executing different paths. During program execution, the OS periodically changes the processor's frequency and voltage based on the temporal information provided by the PMHs. These speed adaptation points are called power management points (PMPs). We evaluate our scheme using two embedded applications: a video decoder and an automatic target recognition application. Our scheme shows an energy reduction of up to 79% over no power management and up to 50% over a static power management scheme.
Sponsorship	IEEE Comput. Soc. Tech. Committee on Real-Time Syst
Starting Page	133
Ending Page	141
File Size	382187
Page Count	9
File Format	PDF
ISBN	0769519563
ISSN	15453421
DOI	10.1109/RTTAS.2003.1203045
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-30
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Real time systems Energy consumption Operating systems Power system management Embedded system Collaboration Battery management systems Dynamic voltage scaling Energy management Voltage control
Content Type	Text
Resource Type	Article

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