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Accurate power characterization is important in computing platforms for several reasons ranging from power-aware adaptation to power provisioning. Power characterization is typically obtained through either direct measurements enabled by physical instrumentation or modeling based on hardware performance counters. The authors show, however, that linear-regression based modeling techniques commonly used in the literature work well only in restricted settings. These techniques frequently exhibit high prediction error in modern computing platforms due to inherent complexities such as multiple cores, hidden device states, and large dynamic power components. Using a comprehensive measurement framework and an extensive set of benchmarks, they consider several more advanced modeling techniques and observe limited improvement.
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