Preemption-aware dynamic voltage scaling in hard real-time systems

Woonseok Kim, Jihong Kim, S. Min
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引用次数: 80

Abstract

Dynamic voltage scaling (DVS) is a well-known low-power design technique for embedded real-time systems. Because of its effectiveness on energy reduction, several variable voltage processors have been developed and many DVS algorithms targeting these processors have been proposed. However, most existing DVS algorithms focus on reducing the energy consumption of CPU only, ignoring their negative impacts on task scheduling and system wide energy consumption. In this paper, we address one of such side effects, an increase in task preemptions due to DVS. We present two preemption control techniques which can reduce the number of task preemptions of DVS algorithms. Experimental results show that the delayed-preemption technique is effective in reducing the number of preemptions incurred by DVS algorithms while achieving a high energy efficiency.
硬实时系统中感知抢占的动态电压缩放
动态电压缩放(DVS)是嵌入式实时系统中一种众所周知的低功耗设计技术。由于其在降低能量方面的有效性,已经开发了几种可变电压处理器,并提出了许多针对这些处理器的分布式交换机算法。然而,大多数现有的分布式交换机算法只关注降低CPU的能耗,而忽略了它们对任务调度和整个系统能耗的负面影响。在本文中,我们解决了其中一个副作用,即由于分布式交换机导致的任务抢占的增加。我们提出了两种可以减少分布式交换机算法任务抢占数量的抢占控制技术。实验结果表明,延迟抢占技术可以有效地减少分布式交换机算法引起的抢占次数,同时达到较高的能量效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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