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Admission control of the Apache web server

Publiceringsår: 2004
Språk: Engelska
Publikation/Tidskrift/Serie: Seventeenth Nordic Teletraffic Seminar, NTS 17, Fornebu, Norway, 25-27 August 2004
Dokumenttyp: Konferensbidrag
Förlag: Fornebu : Telenor


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 G/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 correspond to
the results from the theoretical analysis.



  • Communication Systems
  • Control Engineering


Nordic Teletraffic Seminar
  • ISBN: 82-423-0595-1

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