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Modelling and Design of Admission Control Mechanisms for Web Servers using Non-linear Control Theory

In English

Författare

Redaktör

  • Robert D. van der Mei
  • Frank Huebner

Summary, in English

Web sites are exposed to high rates of incoming requests. Since web sites are sensitive to overload, admission control mechanisms are often implemented. The purpose of such a mechanism is to prevent requests from entering the web server during high loads. This paper presents how admission control mechanisms can be designed and implemented with a combination of queueing theory and control theory. Since web servers behave non-linear and stochastic, queueing theory can be used for web server modelling. However, there are no mathematical tools in queueing theory to use when designing admission control mechanisms. Instead, control theory contains the needed mathematical tools. By analysing queueing systems with control theoretic methods, good admission control mechanisms can be designed for web server systems. In this paper we model an Apache web server as a GI/G/1-system. Then, we use control theory to design a PI-controller, commonly used in automatic control, for the web server. In the paper we describe the design of the controller and also how itcan be implemented in a real system. The controller has been implemented and tested together with the Apache web server. The server was placed in a laboratory network together with a traffic generator which was used to represent client requests. Measurements in the laboratory setup show how robust the implemented controller is, and how it correspond to the results from the theoretical analysis.

Publiceringsår

2003

Språk

Engelska

Sidor

53-64

Publikation/Tidskrift/Serie

Performance and control of next-generation communication networks : [ITCom's Conference on Performance and Control of Next-Generation Communication Networks] ; 9 - 10 September 2003, Orlando, Florida, USA (SPIE proceedings series ; vol. 5244)

Volym

5244

Issue

1

Dokumenttyp

Konferensbidrag

Förlag

SPIE

Ämne

  • Communication Systems
  • Control Engineering

Nyckelord

  • queueing theory
  • admission control
  • Web servers
  • Apache
  • overload control
  • control theory

Conference name

SPIE Conference on Performance and Control of Next-Generation Communication Networks, 2003

Conference date

2003-09-09 - 2003-09-10

Conference place

Orlando, FL, United States

Status

Published

Projekt

  • Tele- och datakommunikationssystem: Performance Analysis of distributed Applications

Forskningsgrupp

  • Tele- och datakommunikationssystem

ISBN/ISSN/Övrigt

  • ISSN: 1996-756X
  • ISSN: 0277-786X
  • ISBN: 0-8194-5127-4
  • CODEN: PSISDG