Quality of service management using generic modelling and monitoring techniques

In our previous work, we have presented the performability manager, a distributed environment component that, using a model-based approach, realizes and maintains user-requested QoS. Generic modelling and monitoring techniques are inevitable for such a model-based approach. The planning of user-requested QoS is done by the evaluation of automatically created models out of a library of model components, while achieved QoS is checked using monitoring. In this paper we experiment with the generic modelling and monitoring of a multimedia service in an open distributed processing environment. We both use simulation and numerical techniques to evaluate the models. In this particular case study, end-user requested QoS is specified by throughput, mean end-to-end delay and delay-jitter.