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Design and evaluation of load control in web-server systems

Author

Summary, in English

Nonlinear discrete-time modeling of a Web server system is investigated. Server systems typically contain nonlinearities such as saturations and bounded queue lengths. The incoming traffic and service rates are best modeled by stochastic processes, well described and analyzed by queuing theory. Here, we develop and validate a control theoretic model of a general single server queue, a so-called G/G/1-system. Based on the nonlinear system model, design of admission controllers are presented and the closed loop stability is analyzed. The behavior of the server model is verified with respect to queue theoretic models. Finally, experimental evaluation is performed on an Apache Web server in a laboratory network. A traffic generator is used to represent client requests. The control of the Apache server has been re-written to implement our algorithms. We show that the control theoretic model aligns well with the experiments on the Web-server. Measurements in the laboratory setup show the robustness of the implemented controller, and how it corresponds to the results from the theoretical analysis and the simulations.

Publishing year

2004

Language

English

Pages

1980-1985

Publication/Series

Proceedings of the 2004 American Control Conference, ACC : June 30 - July 2, 2004, Boston Sheraton Hotel, Boston, Massachusetts

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Communication Systems
  • Control Engineering

Conference name

American Control Conference, 2004

Conference date

2004-06-30 - 2004-07-02

Conference place

Boston, MA, United States

Status

Published

Project

  • Tele- och datakommunikationssystem: Performance Analysis of distributed Applications

Research group

  • Tele- och datakommunikationssystem

ISBN/ISSN/Other

  • ISSN: 0743-1619
  • ISBN: 0-7803-8335-4