Web-Traveler Policies for Images on Social Networks
World Wide Web
Self-adapting service level in Java enterprise edition
Proceedings of the 10th ACM/IFIP/USENIX International Conference on Middleware
Self-adaptation of service level in distributed systems
Software—Practice & Experience
Self-adapting service level in Java enterprise edition
Middleware'09 Proceedings of the ACM/IFIP/USENIX 10th international conference on Middleware
Adaptive run-time performance optimization through scalable client request rate control
Proceedings of the 2nd ACM/SPEC International Conference on Performance engineering
ASE '11 Proceedings of the 2011 26th IEEE/ACM International Conference on Automated Software Engineering
Adaptive admission control algorithm in a QoS-aware Web system
Information Sciences: an International Journal
Performance modeling and analysis of a database server with write-heavy workload
ESOCC'12 Proceedings of the First European conference on Service-Oriented and Cloud Computing
Enhancing web server relative delay services by an integrated SA-fuzzy logic controller
International Journal of Web Engineering and Technology
Task scheduling: A control-theoretical viewpoint for a general and flexible solution
ACM Transactions on Embedded Computing Systems (TECS)
Hi-index | 0.00 |
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.