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For parallelization, I suggest running multiple Robocode instances, each installed in a different location. That's what is done for the RoboRumble.

Note that if you are using bots from the rumble to train against, some of your opponent bots might use static variables, file saving etc. Which makes having separate instances important. Also, make sure you run enough battles for each tweak to get a statistically significant sample, otherwise you'll be chasing ghosts =)