Du är här

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

Författare:
Redaktör:
  • Robert D. van der Mei
  • Frank Huebner
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
Nummer: 1
Dokumenttyp: Konferensbidrag
Förlag: The International Society for Optical Engineering (SPIE)

Sammanfattning

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.

Disputation

Nyckelord

  • Technology and Engineering
  • queueing theory
  • admission control
  • Web servers
  • Apache
  • overload control
  • control theory

Övriga

SPIE Conference on Performance and Control of Next-Generation Communication Networks
9-10 Sept. 2003
Orlando, FL, USA
Published
  • Tele- och datakommunikationssystem: Performance Analysis of distributed Applications
Yes
  • Tele- och datakommunikationssystem
  • ISSN: 0277-786X
  • ISBN: 0-8194-5127-4
  • CODEN: PSISDG

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

 

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen