Combining the synchronous protocol with the optimistic time management algorithm (TMA) to improve the latency and the processor idle time

The concept of Global virtual time (GVT) has become an essential element of optimistic time management algorithms (TMA) that provide synchronization in a parallel and distributed computing environment. The performance of this optimistic TMA is optimal since it gives accurate GVT approximation. However, this accurate GVT approximation comes at the expense of slower execution rate which results a high GVT latency. Since this resultant GVT latency is not only high but also widely varied, the multiple processors involve in communication remain idle during that period of time. This paper examines the potential use of tress and butterflies barriers with the Mattern's optimistic TMA [1] using a ring structure. Our Simulation and numerical results verify that the use of tree barriers with the Mattern's GVT structure can significantly improve the latency time and thus increase the overall throughput of the parallel and scalable distributed simulation systems.