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An Efficient Voltage Scheduling for Embedded Real-Time Systems with Task Synchronization  

Lee, Jae-Dong (경남대학교 컴퓨터공학부)
Hur, Jung-Youn (경남대학교 컴퓨터공학부)
Publication Information
Journal of KIISE:Computer Systems and Theory / v.35, no.6, 2008 , pp. 273-283 More about this Journal
Abstract
Many embedded real-time systems have adopted processors supported with dynamic voltage scaling(DVS) recently. Power is one of the important metrics for optimization in the design and operation of embedded real-time systems. We can save considerable energy by using slowdown of processor supported with DVS. In this paper, we propose heuristic algorithms to calculate task slowdown factors for an efficient energy consumption in embedded real-time systems with task synchronization. The previous algorithm has a following constraint : given the tasks are ordered in a nondecreasing order of their relative deadline, the task slowdown factors computed are in a nonincreasing order. In this paper, we relax the constraint and propose heuristic algorithms which have the same time complexity that previous algorithm has and can save more energy. Experimental results show that the proposed algorithms are energy efficient.
Keywords
DVS(dynamic voltage staling); embedded real-time systems; task synchronization; slowdown;
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