Quantitative system performance: computer system analysis using queueing network models
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In this paper, a Layered Queueing Network (LQN) performance model is used for studying an Apache-PHP web application with PostgreSQL backend-database. Performance evaluation is done by obtaining load test measurements and by solving the LQN model. Model validation is performed by comparing the model results with the load test results. With average error of 3.77% for throughput and 12.15% for response times the model is shown to capture the web application@?s performance. Furthermore, performance analysis is done to determine the system configuration which would ease the identified bottleneck resource.