Algebraic and Topological Structure of QOS (End to End) Within Large Scale Distributed Information Systems

End-to-end quality of service QoSete in large scale distributed information systems DIS is essential for intelligent system acquisition and design. Without well-developed mechanisms to measure system performance in terms of user requirements, systems can only be built in an ad-hoc manner. The QoSete model formalizes the identification of user requirements and provides performance metrics that are based on empirically measurable attributes that indicate how well user requirements have been met. These performance metrics manifest through the Benefit Function, which is then used for resource dimensioning. Ideally, large scale DIS should be designed and built to efficiently match both system and capital resources to pre-defined user requirements. This avoids users receiving unacceptably low levels of service andor expending unnecessary capital. The current barriers to achieving QoSete include a lack of understanding of user requirements, the lack of a practical interface between the users and system designers, the lack of a common framework for integration of concepts between the various areas of expertise within the system, and the lack of a mature composability theory that allows such systems to be designed in a modular sense. The work herein addresses to some degree primarily at a high-level each of these obstacles, as well as providing insight into a number of related issues.