Replicated Web Services: A Comparative Analysis of Client-Based Content Delivery Policies
Revised Papers from the NETWORKING 2002 Workshops on Web Engineering and Peer-to-Peer Computing
Performance Evaluation - Performance modelling and evaluation of heterogeneous networks
Feedback Control Architecture and Design Methodology for Service Delay Guarantees in Web Servers
IEEE Transactions on Parallel and Distributed Systems
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In this paper, we use a session-based workload to measure a performance of a commercial web server. We define a session as a sequence of client requests. An overloaded web server can experience a severe loss of throughput when measured as the number of completed sessions. Moreover, the overloaded web server discriminates against longer sessions. Session based admission control (SBAC) prevents a web server from becoming overloaded and ensures that longer sessions can be completed. We propose two new adaptive admission control strategies: hybrid and predictive, aiming to optimize the performance of SBAC mechanism. The hybrid strategy is based on a self-tunable admission control function, which adjust itself accordingly to variations in traffic loads. It shows improved performance results for workloads with medium to long average session length. The predictive strategy estimates and predicts the number of new sessions it can accept and still guarantee processing of all future session requests. It consistently shows the best performance results for different workloads and different traffic loads.