rope was second with 102, down from 112. China had 63, and Japan 28.
This is the 42nd time this list has been put out. It’s a joint project run by Hans Meuer of the University of Mannheim in Germany, Erich Strohmaier and Horst Simon of Lawrence Berkeley National Laboratory, and Jack Dongarra of the University of Tennessee, Knoxville. You can see the full list here.
The list pretty much covers the waterfront in listing the supercomputers publicly known to exist around the world. For the most part, the universities and other entities that have them, like to brag about their position on the list when they can. What the list doesn’t cover are the secret machines that might be used by government agencies like the U.S. National Security Agency and similar government spy shops around the world. One wonders if there’s information about just such a machine in the files of Edward Snowden.
* Quadrillions come after trillions, in case you hadn’t been keeping track.
(A small correction: I initially said Titan — number two — was the most energy-efficient system. It’s actually Piz Daint, number six.)