A Queue-Shift Approximation Technique for Product-Form Queueing

  • Authors:
  • Paul J. Schweitzer;Giuseppe Serazzi;Marco Broglia

  • Affiliations:
  • -;-;-

  • Venue:
  • TOOLS '98 Proceedings of the 10th International Conference on Computer Performance Evaluation: Modelling Techniques and Tools
  • Year:
  • 1998

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Abstract

Increasing complexity of actual computer systems has made exact modelling techniques prohibitively expensive, and the need for approximation techniques for performance evaluation is well-recognized. A new approximation technique is given for product-form queueing networks with constant-rate servers. It estimates the shift in mean queue lengths rather than the fractional deviations used in the Chandy-Neuse linearizer. Experimental results are reported which show that the new approximation 92% of the times has superior accuracy to linearizer. As population grows, the superior accuracy over linearizer increases. In 58% of the test cases, the new approximation technique gave errors of zero (at least 6 digits) while linearizer achieves such accuracy in less than 2.5% of cases. In some of the stress cases described, the new approximation technique has roughly five orders of magnitude less error than linearizer.