Monte Carlo summation and integration applied to multiclass queuing networks

  • Authors:
  • Keith W. Ross;Danny H. K. Tsang;Jie Wang

  • Affiliations:
  • Univ. of Pennsylvania, PA;The Hong Kong Univ. of Science and Technology, Kowloon, Hong Kong;Univ. of Pennsylvania, PA

  • Venue:
  • Journal of the ACM (JACM)
  • Year:
  • 1994

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Abstract

Although many closed multiclass queuing networks have a product-form solution, evaluating their performance measures remains nontrivial due to the presence of a normalization constant. We propose the application of Monte Carlo summation in order to determine the normalization constant, throughputs, and gradients of throughputs. A class of importance-sampling functions leads to a decomposition approach, where separate single-class problems are first solved in a setup module, and then the original problem is solved by aggregating the single-class solutions in an execution model. We also consider Monte Carlo methods for evaluating performance measures based on integral representations of the normalization constant; a theory for optimal importance sampling is developed. Computational examples are given that illustrate that the Monte Carlo methods are robust over a wide range of networks and can rapidly solve networks that cannot be handled by the techniques in the existing literature.