To enable solving of the field equations on the grid efficient, a secondary temporary decomposition is used to partition the simulation space evenly among the processors. After computing charge deposition by the particles, grid point data are exchanged among the processors to allow processors to solve field equations in their secondary partitions. Frequent communication between processors makes this method inefficient on NOWs. Plasma Simulation using a replicated grid To reduce frequent communication among the processors, the NOW version replicates the grid on all processors. Since the entire grid is now local, no interaction is needed between particles on one processor and grid points on another.
Particles can now remain on the same processor during the entire simulation.
This eliminates communication due to movement of particles. The replicated grid version of the plasma simulation performs well on NOWs. In plasma simulation, the computation state consists of particle and field data. The particle data including positions and velocities need to be replicated on a neighbor process as part of data replication. Thus the particle data constitutes specific system state .