Scalable Applications for Energy-Aware Processors

Next generation processors for battery operated computing systems can work under different voltage levels to balance speed versus power consumption. In such a way, the performance of a system can be degraded to achieve a longer battery duration, or it can be increased when the battery level is high. Unfortunately, however, in the presence of timing and resource constraints, the performance of a real-time system does not always improve as the speed of the processor is increased. Similarly, when reducing the processor speed, the quality of the delivered service may not always degrade as expected.This paper presents the potential problems that may arise in a voltage-controlled real-time system and proposes an approach that allows to develop real-time applications, whose performance can be scaled in a controlled fashion as a function of the processor speed.

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