An approximation to the response time for shortest queue routing

  • Authors:
  • R. D. Nelson;T. K. Philips

  • Affiliations:
  • IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York;IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York

  • Venue:
  • SIGMETRICS '89 Proceedings of the 1989 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
  • Year:
  • 1989

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Abstract

In this paper we derive an approximation for the mean response time of a multiple queue system in which shortest queue routing is used. We assume there are &Kgr; identical queues with infinite capacity and service times that are exponentially distributed. Arrivals of jobs to this system are Poisson and are routed to a queue of minimal length. We develop an approximation which is based on both theoretical and experimental considerations and, for &Kgr; ≤ 8, has an relative error of less than one half of one percent when compared to simulation. For &Kgr; = 16, the relative error is still acceptable, being less than 2 percent. An application to a model of parallel processing and a comparison of static and dynamic load balancing schemes are presented.