Write a binary restart file of the current state of the simulation. Only particle information is stored in a restart file.
During a long simulation, the restart command is typically used to dump restart files periodically. The write_restart command is useful between simulations or whenever you wish to write out a single current restart file.
Restart files can be read by a read_restart command to restart a simulation from a particular state. Because the file is binary (to enable exact restarts), it may not be readable on another machine.
This command can only be used for spatial simulations.