Web-server systems HTCPNs-based development tool application in load balance modelling

A new software tool for web-server systems development is presented. The tool consist of a set of predefined Hierarchical Timed Coloured Petri Net (HTCPN) structures - patterns. The patterns make it possible to naturally construct typical and experimental server-systems structures. The preliminary patterns are executable queueing systems. A simulation based methodology of web-server model analysis and validation has been proposed. The paper focuses on presenting the construction of the software tool and its application for selected cluster-based web-servers load balancing strategies evaluation.