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Optimal choice of threshold in Two Level Processor Sharing

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  • Konstantin Avrachenkov
  • Patrick Brown
  • Natalia Osipova

Abstract

We analyze the Two Level Processor Sharing (TLPS) scheduling discipline with the hyper-exponential job size distribution and with the Poisson arrival process. TLPS is a convenient model to study the benefit of the file size based differentiation in TCP/IP networks. In the case of the hyper-exponential job size distribution with two phases, we find a closed form analytic expression for the expected sojourn time and an approximation for the optimal value of the threshold that minimizes the expected sojourn time. In the case of the hyper-exponential job size distribution with more than two phases, we derive a tight upper bound for the expected sojourn time conditioned on the job size. We show that when the variance of the job size distribution increases, the gain in system performance increases and the sensitivity to the choice of the threshold near its optimal value decreases. Copyright Springer Science+Business Media, LLC 2009

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  • Konstantin Avrachenkov & Patrick Brown & Natalia Osipova, 2009. "Optimal choice of threshold in Two Level Processor Sharing," Annals of Operations Research, Springer, vol. 170(1), pages 21-39, September.
    • Handle: RePEc:spr:annopr:v:170:y:2009:i:1:p:21-39:10.1007/s10479-008-0430-2
    DOI: 10.1007/s10479-008-0430-2
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    1. Linus Schrage, 1968. "Letter to the Editor—A Proof of the Optimality of the Shortest Remaining Processing Time Discipline," Operations Research, INFORMS, vol. 16(3), pages 687-690, June.
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