Efficient Simulation of Network Models in c + +

This paper shows how object oriented programming concepts may be used to establish a framework for supporting simulation model programming. It describes how this has been implemented in a system written in CH called SIC. Its support of stochastic simulation concerns three fields: First, a library of simulation tools for random number generation and statistical analysis is offered along with a mechanism for implementing process oriented simulation. Second, a modeling toolkit has been set up and may easily be extended by the user, facilitating model construction and reuse of components in different programs. Third, based on s:.lch a toolkit and the SIC program structure, a system for graphical generation of simulation programs has been established with an X window based graphic editor, which is also used for graphic output of intermediate and final results. The reusability of model components offered by the object oriented design techniques of CH is illustrated by examples of queueing network models comparing different scheduling strategies. A simulation model of the DQDB MAN is presented showing how such structured models may be implemented appropriately in SIC.