Brief Announcement: Energy Optimization of Memory Intensive Parallel Workloads

Chhaya Trehan, H. Vandierendonck, G. Karakonstantis, Dimitrios S. Nikolopoulos
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Abstract

Energy consumption is an important concern in modern multicore processors. The energy consumed during the execution of an application can be minimized by tuning the hardware state utilizing knobs such as frequency, voltage etc. The existing theoretical work on energy minimization using Global DVFS (Dynamic Voltage and Frequency Scaling), despite being thorough, ignores the energy consumed by the CPU on memory accesses and the dynamic energy consumed by the idle cores. This article presents an analytical energy-performance model for parallel workloads that accounts for the energy consumed by the CPU chip on memory accesses in addition to the energy consumed on CPU instructions. In addition, the model we present also accounts for the dynamic energy consumed by the idle cores. We present an analytical framework around our energy-performance model to predict the operating frequencies for global DVFS that minimize the overall CPU energy consumption. We show how the optimal frequencies in our model differ from the optimal frequencies in a model that does not account for memory accesses.
简要公告:内存密集型并行工作负载的能量优化
能量消耗是现代多核处理器的一个重要问题。应用程序执行期间消耗的能量可以通过利用旋钮(如频率、电压等)调整硬件状态来最小化。现有的基于全局DVFS (Dynamic Voltage and Frequency Scaling,动态电压频率缩放)的能量最小化理论研究虽然很彻底,但忽略了CPU在内存访问时所消耗的能量和空闲内核所消耗的动态能量。本文提出了一个用于并行工作负载的分析能量-性能模型,该模型除了考虑CPU指令消耗的能量外,还考虑了CPU芯片在内存访问上消耗的能量。此外,我们提出的模型还考虑了空闲核所消耗的动态能量。我们围绕我们的能源性能模型提出了一个分析框架,以预测全局DVFS的工作频率,从而最大限度地减少CPU的总体能耗。我们展示了我们模型中的最佳频率与不考虑内存访问的模型中的最佳频率有何不同。
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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