JTED: parallel discrete-event simulation in Java

JTED is a prototype of a Java-based framework for discrete event simulation, currently demonstrating parallel speedup on shared-memory multiprocessor platforms. JTED speci es a set of base classes for building simulations; the modeler de nes a particular simulation by creating derived classes, lling in the \hot spots" of the framework with active event-processing code, and registering instances of the derived classes with the running framework. The JTED modeler is freed from some of the routine bookkeeping chores common to most discrete-event simulations, including event delivery, timestamp generation, process scheduling, and logical clock management. The framework also provides standard hooks for integrating graphical tools with a running simulation. Most importantly, the framework's semantic restrictions allow user models to be parallelized, with various degrees of transparency, without the intervention of a compiler or a special-purpose modeling language. JTED attempts to replicate (in Java) the advances in high-level modeling achieved by the TeD system from Georgia Tech [2, 3], which used a custom little language compiled to C++ and the Georgia Time Warp simulation kernel[1]. The design metaphor common to TeD and JTED models is that of nested Entities, connected by Channels over which Processes receive and dispatch Events, as described in gure 1.