Enhancement of Memory Pools Toward a Multi-Threaded Implementation of the Joint Integrated Mission Model (JIMM)

The joint integrated mission model (JIMM) is a legacy real-time discrete-event simulator. Its initial single-threaded implementation employed a memory pool to speed up run-time performance and easily checkpoint simulation state. Unfortunately, when JIMM started migrating to a multi-threaded implementation, this legacy memory pool was quickly identified as a bottleneck. This problem is addressed by dividing the memory into large chunks managed by a global controller but where thread-specific memory managers handled lower level memory allocation. This paper focuses on the legacy memory pool in JIMM and enhancements necessary for an efficient multi-threaded implementation