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Control-theoretic Analysis of Admission Control Mechanisms for Web Server Systems

Author

Summary, in English

Web sites are exposed to high rates of incoming requests. The servers may become overloaded during temporary traffic peaks when more requests arrive than the server is designed for. An admission control mechanism rejects some requests whenever the arriving traffic is too high and thereby maintains an acceptable load in the system. This paper presents how admission control mechanisms can be designed with a combination of queueing theory and control theory. In this paper we model an Apache web server as a GI/G/1-system and then design a PI-controller, commonly used in automatic control, for the server. The controller has been implemented as a module inside the Apache source code. Measurements from the laboratory setup show how robust the implemented controller is, and how it corresponds to the results from the theoretical analysis.

Publishing year

2008

Language

English

Pages

93-116

Publication/Series

World Wide Web

Volume

11

Issue

1

Document type

Journal article

Publisher

Springer

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Control Engineering

Keywords

  • queueing theory
  • control theory
  • system design
  • admission control

Status

Published

Project

  • Broadband Communications: Modelling and Control of Server Systems
  • LCCC

Research group

  • Broadband Communication
  • LCCC

ISBN/ISSN/Other

  • ISSN: 1386-145X