Parallel and Distribution Simulation Systems
Parallel and Distribution Simulation Systems
Language based simulation, flexibility, and development speed in the joint integrated mission model
WSC '05 Proceedings of the 37th conference on Winter simulation
Proceedings of the 38th conference on Winter simulation
Employing proxies to improve parallel discrete event simulation performance
Proceedings of the Winter Simulation Conference
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The Joint Integrated Mission Model (JIMM) is a real-time legacy battlefield simulator employed in detailed analyses and virtual exercises. To leverage more processors to improve real-time execution, a worker pool of threads optimistically executes events in parallel but avoids cascading rollback by executing only one future event per simulated object. Safeguards for maintenance of simulation state are programmed explicitly and either deferred or immediate modification of state variables could be employed in case of event rollback. In the beginning of the main parallelization effort, deferred modification was used where simulation state is updated only when the event can be completed safely. However, after successful implementation, it was determined to be impractical. Later, all safeguard programming employed immediate modification where original state is restored in case of rollback. This paper discusses these techniques for parallel execution of events in JIMM from initial efforts through later code maintenance.