ACM Transactions on Programming Languages and Systems (TOPLAS)
Time warp on a shared memory multiprocessor
Transactions of the Society for Computer Simulation International
The treatment of state in optimistic systems
PADS '95 Proceedings of the ninth workshop on Parallel and distributed simulation
Buffer management in shared-memory Time Warp systems
PADS '95 Proceedings of the ninth workshop on Parallel and distributed simulation
False Sharing and Spatial Locality in Multiprocessor Caches
IEEE Transactions on Computers
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We report on a comparative study of the performance of shared and distributed memory parallel simulation algo rithms on a large-scale military logistics simulation, and describe the nature of the application and its parallelisa tion in some detail. We demonstrate that the patterns of communication in the simulation were such that a standard implementation of Breathing Time Buckets (BTB) was unable to achieve any speed-up. New variants of BTB were designed and implemented, and we were able to achieve a speed-up of 7.4 compared to a critical path limit of 16.9. The logistics simulation contained a number of complex data structures and its parallel implementation was highly memory-intensive. The resulting patterns of memory access significantly degraded the shared memory simulation performance relative to the equivalent distributed memory version. These results cast doubt on the effectiveness of the current generation of shared memory parallel computers in dealing with optimistic simulations of large, dynamic scenarios.