Fuzzy control for guaranteeing absolute delays in web servers

Yaya Wei*, Chuang Lin, Xiaowen CHU, Thiemo Voigt

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

4 Citations (Scopus)


This paper presents a fuzzy control approach that guarantees absolute delays in web servers. Previous work has proposed the use of classical Proportional-Integral (PI) controllers for delay guarantees. However, a disadvantage of the classical PI controller is that the system model, which is obtained by system identification, mismatches the real system and inevitably degrades the performance of the web system. In contrast with classical PI controllers, fuzzy controllers are non-linear and therefore independent of the accurate model of the plant, i.e., the controlled system. Hence, fuzzy controllers seem to be very suitable for web servers. Our experiments show that fuzzy controllers indeed perform better than PI controllers presented in earlier papers.

Original languageEnglish
Pages (from-to)338-346
Number of pages9
JournalInternational Journal of High Performance Computing and Networking
Issue number5-6
Publication statusPublished - 2006

Scopus Subject Areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications

User-Defined Keywords

  • control
  • fuzzy control
  • PI
  • proportional-integral
  • resource scheduling
  • web QoS


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