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

In English

Författare

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.

Publiceringsår

2008

Språk

Engelska

Sidor

93-116

Publikation/Tidskrift/Serie

World Wide Web

Volym

11

Issue

1

Dokumenttyp

Artikel i tidskrift

Förlag

Springer

Ämne

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

Nyckelord

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

Status

Published

Projekt

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

Forskningsgrupp

  • Broadband Communication
  • LCCC

ISBN/ISSN/Övrigt

  • ISSN: 1386-145X