Si: A Lightweight-Process Interaction Simulation System

The Si lightweighlrprocess based system for simulating process interadions is an enhancement to the C programming language in t.he form of library primitives with sets of predefined data structures. The Si system encapsulates an existing lightweight-process library to provide a discrete-event 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. ~ Research supported in part by NSF a.ward CCR-9102331, NATO award 900108 and the Mathematical Sciences Section of Oak Ridge Nalional Laboratory under contract contract DE-ACOS-8010R21400 with Marlin Marietta Energy Systems, Inc.