Performance Evaluation of Distributed System Using SPN

Distributed system poses one of the main streams of information and communication technology arena with immense complexity. Designing and implementation of such complex systems are always an intricate endeavour. Likewise, performance evaluation is also a great concern of such complex system to evaluate whether the system meets the performance related system requirements. Hence, modeling plays an important role in the whole design process of the system for qualitative and quantitative analysis. However, in a distributed system, system functional behavior is normally distributed among several objects. The overall behavior of the system is composed of the partial behavior of the distributed objects of the system. So it is indispensable to capture the functional behavior of the distributed objects for appropriate analysis to evaluate the performance related factors of the overall system. We therefore adopt UML collaboration and activity oriented approach as UML is the most widely used modeling language which models both the system requirements and qualitative behavior through different notations. Collaboration and activity diagram are utilized to demonstrate the overall system behavior by defining both the structure of the partial object behavior as well as the interaction between them as reusable specification building blocks and later on, this UML specification style is applied to generate the SPN model by our performance modeling framework. UML collaboration and activity provides a tremendous modeling framework containing several interesting properties. Firstly, collaborations and activity model the concept of service provided by the system very nicely. They define structure of partial object behavior, the collaboration roles and enable a precise definition of the overall system behavior. They also delineate the way to compose the services by means of collaboration and role bindings [12].