The Use of Optimal Filters to Track Parameters of Performance Models

  • Authors:
  • Murray Woodside;Tao Zheng;Marin Litoiu

  • Affiliations:
  • Carleton University, Ottawa, Canada;Carleton University, Ottawa, Canada;IBM Toronto Lab Canada

  • Venue:
  • QEST '05 Proceedings of the Second International Conference on the Quantitative Evaluation of Systems
  • Year:
  • 2005

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Abstract

Autonomic computer systems react to changes in the system, including failures, load changes, and changed user behaviour. Autonomic control may be based on a performance model of the system and the software, which implies that the model should track changes in the system. A substantial theory of optimal tracking filters has a successful history of application to track parameters while integrating data from a variety of sources, an issue which is also relevant in performance modeling. This work applies Extended Kalman Filtering to track the parameters of a simple queueing network model, in response to a step change in the parameters. The response of the filter is affected by the way performance measurements are taken, and by the observability of the parameters.