Empirical Characterization of Session---Based Workload and Reliability for Web Servers
Empirical Software Engineering
Empirical Software Engineering
Empirical observations on the session timeout threshold
Information Processing and Management: an International Journal
International Journal of Business Intelligence and Data Mining
Investigating the distributional property of the session workload
Journal of Web Engineering
Information Processing and Management: an International Journal
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The growing availability of Internet access has led to significant increase in the use of World Wide Web. If we are to design dependable Web-based systems that deal effectively with the increasing number of clients and highly variable workload, it is important to be able to describe the Web workload and errors accurately. In this paper we focus on the detailed empirical analysis of the session-based workload and reliability based on the data extracted from actual Web logs of ten Web servers. First, we address the data collection process and describe the methods for extraction of workload and error data from Web log files. Then, we introduce and analyze several intra-session and inter-session metrics that collectively describe Web workload in terms of user sessions. Furthermore, we analyze Web error characteristics and estimate the request-based and session-based reliability of Web servers. Finally, we identify the invariants of the Web workload and reliability that apply through all data sets considered. The results presented in this paper show that session-based workload and reliability are better indicators of the users perception of the Web quality than the request-based metrics and provide more useful measures for tuning and maintaining of the Web servers.