Title:
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Software directed issue queue power reduction
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Author:
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Jones, Timothy M.; O’Boyle, Michael F.P.; Abella Ferrer, Jaume; González Colás, Antonio María
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors; Universitat Politècnica de Catalunya. ARCO - Microarquitectura i Compiladors |
Abstract:
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The issue logic of a superscalar processor dissipates a large amount of static and dynamic power. Furthermore, its power density makes it a hot-spot requiring expensive cooling systems and additional packaging. In this paper we present a novel software assisted approach to power reduction where the processor dynamically resizes the issue queue based on compiler analysis. The compiler passes information to the processor about the number of entries needed which limits the number of instructions dispatched and resident in the queue. This saves power without adversely affecting performance. Compared with recently proposed hardware techniques, our approach is faster, simpler and saves more power. Using a simplistic scheme we achieve 47% dynamic and 31% static power savings in the issue queue with only a 2.2% performance loss. We then show that the performance loss can be reduced to less than 1.3% with 45% dynamic and 30% static power savings, outperforming all current approaches. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Informàtica::Arquitectura de computadors -Compilers (Computer programs) -Microprocessors -- Energy consumption -Parallel architectures -Queueing theory -Program compilers -Compiladors (Programes d'ordinador) -Microprocessadors -- Consum d'energia |
Rights:
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Document type:
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Article - Published version Conference Object |
Published by:
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Institute of Electrical and Electronics Engineers (IEEE)
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