Performance evaluation of communications in distributed systems and web based service architectures

Performance evaluation is still a topic that attains a lot of attention in both distributed and mobile systems as well as web based services architectures. Due to the recent advances in internet based applications as well as distributed and mobile communication systems, we are witnessing a variety of new technologies. However,these systems are becoming very large and complex at the same time. Several challenges remain to be resolved before these systems become a commodity. Guaranteeing Quality of Service (QoS)and provisioning of web-based systems as well as distributed and mobile systems and evaluating their communication performance represent among the challenging problem in the design of these systems. Quantitative analysis can be very difficult and may be intractable because of the state space explosion. New methods and tools have recently emerged for these kinds of complex systems,such as Stochastic Automata Networks, Stochastic bounds, and so forth.