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Exact simulation of the stationary distribution of the FIFO M/G/c queue

Published online by Cambridge University Press:  14 July 2016

Karl Sigman*
Affiliation:
Columbia University, Department of Industrial Engineering and Operations Research, Columbia University, MC: 4704, New York, NY 10027, USA. Email address: [email protected]
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Abstract

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We present an exact simulation algorithm for the stationary distribution of the customer delay D for first-in–first-out (FIFO) M/G/c queues in which ρ=λ/μ<1. We assume that the service time distribution G(x)=P(Sx),x≥0 (with mean 0<E(S)=1/μ<∞), and its corresponding equilibrium distribution Ge(x)=μ∫0x P(S>y)dy are such that samples of them can be simulated. We further assume that G has a finite second moment. Our method involves the general method of dominated coupling from the past (DCFTP) and we use the single-server M/G/1 queue operating under the processor sharing discipline as an upper bound. Our algorithm yields the stationary distribution of the entire Kiefer–Wolfowitz workload process, the first coordinate of which is D. Extensions of the method to handle simulating generalized Jackson networks in stationarity are also remarked upon.

Type
Part 4. Simulation
Copyright
Copyright © Applied Probability Trust 2011 

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