This may be a bit of a easy question, but I couldn't find anything about it after googling a bit, sorry!
Is there any way to make a command use both of my CPU cores? I am currently processing some PDF files using GhostScript, but whenever I run the command in the terminal, it uses only around 100% of my CPU. I have to run two instances of it to get it to use 200% of my CPU and thus be twice as fast. Even then, for some reason, 40% of my CPU is "idle," according to Activity Monitor, which may imply that I can run more instances.
Is there a way to make this GhostScript command use all of my CPU to be as fast as possible, without having to manually run multiple instances of the command?