A Simultation Testbed based on Lightweight Processes

The Si lightweight-process based system for simulating process interactions is an enhancement to the C programming languge in the form of library primitives with sets of predefined data structures. The Si system encapsulates an existing lightweight-process library to provide a discreteevent simulation environment supporting the process view. It was developed as a research testbed for investigating methods which support simulations efficiently. Easy extensions and modifications to the Si system are a major design objective, accomplished through modularity and layering. This paper describes the system, our experiences with its implementation, and its applicability to simulation modeling. We report on performance measurements of different implementations of the simulation scheduler, and of different algorithms for simulating service disciplines.