Supercomputers are in the news. The biggest news is, with the latest Top 500 listing, all the world’s fastest supercomputers are running at Petaflop speeds or faster. Of those, number eleven, the IBM-built Pangea III supercomputer, runs for a private company. And, Nvidia is adding support for Arm’s CPU architecture to its GPU platform to create energy efficient supercomputing. What do all these have in common? Every last one runs Linux.