Linux.com - https://www.linux.com/news/supercomputers-all-linux-all-time-2
The latest TOP500 Supercomputer list is out. What’s not surprising is that Linux runs on every last one of the world’s fastest supercomputers. What is surprising is that GPUs, not CPUs, now power most of supercomputers’ speed.
Once more, if you want to run the fastest possible computer, the June 2018 TOP500 supercomputing ranking shows that Linux is the best of all operating systems. Every last one is running Linux.