Regulagem Dinâmica de Voltagem em Sistemas de Tempo Real

Bruno A. NovelliJ. C. B. LeiteJosé M. UrrizaJavier D. Orozco

This paper presents methods for power saving in real-time systems, through dynamic voltage scaling. These methods, for rate monotonic schedulers, use slack stealing to slowdown the frequency of execution of the processor. An off-line phase calculates the smaller frequency that still guarantees all timing constraints. An on-line phase takes into account the additional time produced by tasks that run for less than their worst-case execution time, and the slack left in the first phase, to yet reduce the frequency of execution. Results obtained through simulation show the improvements obtained with the use of the proposed methods.

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