It wasn’t always that way. Whizz back to 1998 when Linux was still clawing its way out of the primordial binary ooze and just a single supercomputer ran it. Jump forward six years and that figure had exploded to 291 of the top-500 supercomputers and Linux never looked back. Now, I’m no expert (we could probably stop the sentence there) in supercomputers, but the benefits of a GNU/Linux OS apply as much to your home user as they do to supercomputer manufacturers. There’s no per-core licence to worry about – which becomes a big worry if you have 3.1 million processors to power.