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The Energy/Frequency Convexity Rule: Modeling and Experimental Validation on Mobile Devices

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Résumé

This paper provides both theoretical and experimental evidence for the existence of an Energy/Frequency Convexity Rule, which relates energy consumption and CPU frequency on mobile devices. We monitored a typical smartphone running a speci c computing-intensive kernel of multiple nested loops written in C using a high-resolution power gauge. Data gathered during a week-long acquisition campaign suggest that energy consumed per input element is strongly correlated with CPU frequency, and, more interestingly, the curve exhibits a clear minimum over a 0.2 GHz to 1.6 GHz window. We provide and motivate an analytical model for this behavior, which ts well with the data. Our work should be of clear interest to researchers focusing on energy usage and minimization for mobile devices, and provide new insights for optimization opportunities.
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Dates et versions

hal-00919414 , version 1 (16-12-2013)

Identifiants

Citer

Karel de Vogeleer, Gérard Memmi, Pierre Jouvelot, Fabien Coelho. The Energy/Frequency Convexity Rule: Modeling and Experimental Validation on Mobile Devices. Workshop on Power and Energy Aspects of Computation, In conjunction with the 10th International Conference on Parallel Processing and Applied Mathematics (PPAM'2013), Sep 2013, Varsovie, Poland. pp 793-803, ⟨10.1007/978-3-642-55224-3_74⟩. ⟨hal-00919414⟩
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