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

Publiceringsår: 2008
Språk: Engelska
Sidor: 93-116
Publikation/Tidskrift/Serie: World Wide Web
Volym: 11
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: Springer


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.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • Control Engineering
  • queueing theory
  • control theory
  • system design
  • admission control


  • LCCC
  • Broadband Communications: Modelling and Control of Server Systems
  • Broadband Communication-lup-obsolete
  • LCCC-lup-obsolete
  • ISSN: 1386-145X

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