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Admission control of the Apache web server

Andersson, Mikael LU ; Kihl, Maria LU ; Robertsson, Anders LU and Wittenmark, Björn LU (2004) Nordic Teletraffic Seminar, 2004 In Seventeenth Nordic Teletraffic Seminar, NTS 17, Fornebu, Norway, 25-27 August 2004
Abstract
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.... (More)
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. (Less)
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organization
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Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
Seventeenth Nordic Teletraffic Seminar, NTS 17, Fornebu, Norway, 25-27 August 2004
publisher
Fornebu : Telenor
conference name
Nordic Teletraffic Seminar, 2004
ISBN
82-423-0595-1
language
English
LU publication?
yes
id
097cf69d-46dc-4ae8-87b4-693c97d643c1 (old id 532390)
date added to LUP
2007-09-12 15:32:24
date last changed
2016-07-13 15:19:54
@inproceedings{097cf69d-46dc-4ae8-87b4-693c97d643c1,
  abstract     = {Web sites are exposed to high rates of incoming requests. The servers may become<br/><br>
overloaded during temporary traffic peaks when more requests arrive than the server is<br/><br>
designed for. An admission control mechanism rejects some requests whenever the arriving<br/><br>
traffic is too high and thereby maintains an acceptable load in the system. This paper presents<br/><br>
how admission control mechanisms can be designed with a combination of queueing theory<br/><br>
and control theory. In this paper we model an Apache web server as a G/G/1-system and then<br/><br>
design a PI-controller, commonly used in automatic control, for the server. The controller<br/><br>
has been implemented as a module inside the Apache source code. Measurements from the<br/><br>
laboratory setup show how robust the implemented controller is, and how it correspond to<br/><br>
the results from the theoretical analysis.},
  author       = {Andersson, Mikael and Kihl, Maria and Robertsson, Anders and Wittenmark, Björn},
  booktitle    = {Seventeenth Nordic Teletraffic Seminar, NTS 17, Fornebu, Norway, 25-27 August 2004},
  isbn         = {82-423-0595-1},
  language     = {eng},
  publisher    = {Fornebu : Telenor},
  title        = {Admission control of the Apache web server},
  year         = {2004},
}