The Annals of Applied Probability

Diffusion approximation for a processor sharing queue in heavy traffic

H. Christian Gromoll

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Abstract

Consider a single server queue with renewal arrivals and i.i.d. service times in which the server operates under a processor sharing service discipline. To describe the evolution of this system, we use a measure valued process that keeps track of the residual service times of all jobs in the system at any given time. From this measure valued process, one can recover the traditional performance processes, including queue length and workload. We show that under mild assumptions, including standard heavy traffic assumptions, the (suitably rescaled) measure valued processes corresponding to a sequence of processor sharing queues converge in distribution to a measure valued diffusion process. The limiting process is characterized as the image under an appropriate lifting map, of a one-dimensional reflected Brownian motion. As an immediate consequence, one obtains a diffusion approximation for the queue length process of a processor sharing queue.

Article information

Source
Ann. Appl. Probab., Volume 14, Number 2 (2004), 555-611.

Dates
First available in Project Euclid: 23 April 2004

Permanent link to this document
https://projecteuclid.org/euclid.aoap/1082737104

Digital Object Identifier
doi:10.1214/105051604000000035

Mathematical Reviews number (MathSciNet)
MR2052895

Zentralblatt MATH identifier
1050.60085

Subjects
Primary: 60K25: Queueing theory [See also 68M20, 90B22]
Secondary: 68M20: Performance evaluation; queueing; scheduling [See also 60K25, 90Bxx] 90B22: Queues and service [See also 60K25, 68M20]

Keywords
Processor sharing queue heavy traffic diffusion approximation state space collapse measure valued process

Citation

Gromoll, H. Christian. Diffusion approximation for a processor sharing queue in heavy traffic. Ann. Appl. Probab. 14 (2004), no. 2, 555--611. doi:10.1214/105051604000000035. https://projecteuclid.org/euclid.aoap/1082737104


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The Annals of Applied Probability

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