Fuzzy control for guaranteeing absolute delays in web servers. (2nd May 2007)

• Record Type: Journal Article
• Authors: Wei, Yaya; Lin, Chuang; Chu, Xiaowen; Voigt, Thiemo
• Is Part Of: International journal of high performance computing and networking. Volume 4:Number 5/6(2006)
• Page Start: 338
• Page End: 346
• Publication Date: 2007-05-02
• Subjects: web QoS -- resource scheduling -- fuzzy control -- fuzzy logic -- proportional-integral -- PI control -- quality of service -- high performance computing -- absolute delays -- web servers; High performance computing -- Periodicals; Computer networks -- Periodicals; High performance computing; Periodicals; 004.05
• Languages: English
• ISSNs: 1740-0562

Abstract

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.