An Integrated Framework for Energy Optimization of Embedded Real-Time Applications

Hideki TAKASE  Gang ZENG  Lovic GAUTHIER  Hirotaka KAWASHIMA  Noritoshi ATSUMI  Tomohiro TATEMATSU  Yoshitake KOBAYASHI  Takenori KOSHIRO  Tohru ISHIHARA  Hiroyuki TOMIYAMA  Hiroaki TAKADA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E97-A   No.12   pp.2477-2487
Publication Date: 2014/12/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E97.A.2477
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: High-Level Synthesis and System-Level Design
energy optimization,  compiler,  profiler,  real-time operating systems,  embedded systems,  

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This paper presents a framework for reducing the energy consumption of embedded real-time systems. We implemented the presented framework as both an optimization toolchain and an energy-aware real-time operating system. The framework consists of the integration of multiple techniques to optimize the energy consumption. The main idea behind our approach is to utilize trade-offs between the energy consumption and the performance of different processor configurations during task checkpoints, and to maintain memory allocation during task context switches. In our framework, a target application is statically analyzed at both intra-task and inter-task levels. Based on these analyzed results, runtime optimization is performed in response to the behavior of the application. A case study shows that our toolchain and real-time operating systems have achieved energy reduction while satisfying the real-time performance. The toolchain has also been successfully applied to a practical application.