Realtime Optimistic Scheduler

Optimistic Synchronization, in Realtime ⌚

For some models, optimistic synchronization doesn't provide the much of a performance boost. Many MPI ranks are stuck waiting for a GVT to happen, while one MPI rank continues to process events.

For these models, realtime synchronization may be the way to go. Instead of each MPI rank processing a set number of events before a global GVT phase, each MPI rank processes events for a set period of time.