The Quality of Service (QoS) perceived by users is the dominant factor for the success of an Internet-based Web service. Thus, capacity planning has become essential for deploying Web servers. The aim of this study is to understand the key elements in Web server performance. We created a controlled test-bed environment, which allows one to analyze Web server performance in a simple and effective way. In this paper we present an analysis of two different Web server architectures and their performance, with particular focus on discovering bottlenecks.
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