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Managing performance and power consumption in a server farm
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Emeritus Professor Isi Mitrani
Conference Proceedings (inc. Abstract)
3rd Madrid Conference on Queueing Theory
Year of Conference
28 June - 1 July 2010
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We examine the problem of managing a server farm in a way that attempts to satisfy the conflicting objectives of high performance and low power consumption. A subset of servers is designated as 'reserve'. Those reserves are powered up when the number of jobs in the system is sufficiently high, and are powered down when that number is sufficiently low. The question of how to choose the number of reserves, the up threshold and the downthreshold is answered by analyzing a suitable queueing model and minimiz-ing an appropriate cost function. The solution is obtained in essentially aclosed form, in the sense that there is no need to solve simultaneous sets ofequations. Nevertheless, the search for the optimal policy may be compu-tationally expensive when the number of servers in the farm is large. Forthat reason, heuristic policies are proposed that are easily computable andare close to optimal. Numerical results are presented.
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