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Control-theoretic Analysis of Admission Control Mechanisms for Web Server Systems
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- Kihl, Maria (author)
- Lund University,Lunds universitet,Institutionen för elektro- och informationsteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Electrical and Information Technology,Departments at LTH,Faculty of Engineering, LTH
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- Robertsson, Anders (author)
- Lund University,Lunds universitet,Institutionen för reglerteknik,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Automatic Control,Departments at LTH,Faculty of Engineering, LTH
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- Andersson, Mikael (author)
- Lund University,Lunds universitet,Institutioner vid LTH,Lunds Tekniska Högskola,Departments at LTH,Faculty of Engineering, LTH
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- (creator_code:org_t)
- 2007-08-15
- 2008
- English.
- In: World Wide Web. - : Springer Science and Business Media LLC. - 1386-145X .- 1573-1413. ; 11:1, s. 93-116
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Reglerteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Control Engineering (hsv//eng)
Keyword
- queueing theory
- control theory
- system design
- admission control
Publication and Content Type
- art (subject category)
- ref (subject category)
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