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Volume 32, Issue 2


Towards Energy-Aware Multi-Core Scheduling

J. Richling / J. H. Schönherr / G. Mühl / M. Werner
Published Online: 2009-07-29 | DOI: https://doi.org/10.1515/piko.2009.0017


There are two major current trends that can easily be identified in computer industry: (i) the shift towards massively parallelization fostered by multi-core technology resulting in growing numbers of cores per processor and (ii) the increasing importance of energy-awareness in computing due to rising energy costs and environmental awareness. In current operating systems, these two issues are often addressed independently: one component, the scheduler, assigns processes to cores and a second component manages the power states of individual cores in time. In this paper, we explain why this orthogonal treatment can lead to problems such as a considerably degraded system performance in case of on-demand processor power state management. Furthermore, we present an approach to energy-aware multi-core scheduling at the operating system level avoiding the performance penalty while still saving energy. To corroborate our argumentation and to illustrate the applicability of the presented approach, we give numbers from experiments based on Linux and current multi-core processors.

Index Terms: energy-aware computing; green IT; operating systems; processor scheduling; multi-core processors

About the article

Published Online: 2009-07-29

Published in Print: 2009-06-01

Citation Information: PIK - Praxis der Informationsverarbeitung und Kommunikation, Volume 32, Issue 2, Pages 88–95, ISSN (Online) 1865-8342, ISSN (Print) 0930-5157, DOI: https://doi.org/10.1515/piko.2009.0017.

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