publication . Part of book or chapter of book . 2018

Powernightmares: The Challenge of Efficiently Using Sleep States on Multi-core Systems

Thomas Ilsche; Robert Schöne; Marcus Hähnel; Daniel Hackenberg; Mario Bielert;

Restricted English

Published: 07 Feb 2018

Publisher: Springer International Publishing

Summary

Abstract

Sleep states are an important and well-understood feature of modern server and desktop CPUs that enable significant power savings during idle and partial load scenarios. Making proper decisions about how to use this feature remains a major challenge for operating systems since it requires a trade-off between potential energy-savings and performance penalties for long and short phases of inactivity, respectively. In this paper we analyze the default behavior of the Linux kernel in this regard and identify weaknesses of certain default assumptions. We derive pathological patterns that trigger these weaknesses and lead to ‘Powernightmares’ during which power-saving...

doi: 10.1007/978-3-319-75178-8_50

Subjects

free text keywords: Distributed computing, Idle, Power saving, Supercomputer, Efficient energy use, Workstation, law.invention, law, Linux kernel, Multi-core processor, Computer science, Default

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