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Web QoS Control Using Fuzzy Adaptive PI Controller

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3 Author(s)
Fuquan Tian ; Sch. of Inf. Eng., Jiangnan Univ., Wuxi, China ; Wenbo Xu ; Jun Sun

This paper researches on QoS (Quality of Service) control problems for web servers. A Fuzzy Adaptive PI Control system is proposed in this paper. Via a basic PI controller, the system can dynamically adjust the ratio of request-accepting time in a control period, in order to turn down requests when the server is overloaded. Considering that in a real Internet environment, the network and server load are continually varying in an uncertain range, we use a fuzzy control approach to tune the PI parameters adaptively. Details of the fuzzy control approach are elaborated in this paper. Simulation results demonstrate that in a stable server load environment, the Fuzzy Adaptive PI Control system works as well as the basic PI controller, but it acts much more stably and rapidly dealing with fluctuating loads.

Published in:

Distributed Computing and Applications to Business Engineering and Science (DCABES), 2010 Ninth International Symposium on

Date of Conference:

10-12 Aug. 2010