Lookup NU author(s): Emeritus Professor Isi Mitrani
This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by Springer Verlag, 2018.
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© Springer Nature Switzerland AG. 2018. In this paper, we study a system where the speed of a processor depends on the current number of jobs. We propose a queueing model in which jobs consist of a variable number of tasks, and priority is given to the job with the fewest remaining tasks. The number of processor frequency levels determines the dimensionality of the queueing process. The objective is to evaluate the trade-offs between holding cost and energy cost when setting the processor frequency. We obtain exact results for two and three frequency levels, and accurate approximations that can be further generalized. Numerical and simulation results show the high accuracy of the approximate solutions that we propose. Our experiments suggest that a parsimonius model with only two frequency levels is sufficient, since more elaborate models provide negligible improvements when optimizing the system.
Author(s): Marin A, Mitrani I, Elahi M, Williamson C
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: QEST 2018 International Conference on Quantitative Evaluation of Systems
Year of Conference: 2018
Online publication date: 15/08/2018
Acceptance date: 15/08/2018
Date deposited: 12/11/2018
Publisher: Springer Verlag
Library holdings: Search Newcastle University Library for this item
Series Title: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)