enable-subsystem-threading command enables subsystem threading for the cell cell, or for all cells if the cell argument is omitted.
A cell running in the subsystem simulation mode allows groups of tightly coupled CPUs to be simulated in parallel.
The enable-subsystem-threading command is similar to the "set-threading-mode subsystem" command, except that cells already configured to run in a more parallel threading mode (i.e. use 'multicore' threading), will continue to do so.