Performance Evaluation of J2EE Web Applications with Queueing Networks

The prediction of systems response time for different intensity of users requests, esp. identifying requests loads causing performance degradation becomes an important issue in the design of a e-commerce system. A method for modeling application server environment by the use of queueing networks has been proposed. The physical components of the environment are represented as service centers which form a separable queueing network. Model parameters, i.e. average service times and average visit counts can be experimentally measured in a test environment. Model output are response times for different request classes as well as other parameters describing systems performance. Tools supporting the measurements and model calculations have also been developed. Experiments carried out on a J2EE Web application show that the model predicts real systems performance with satisfactory accuracy.