Worlds fastest super computer
Tianhe-I, Tianhe-1 or TH-1  in English, "Milky Way (literally, Sky  River) Number One", is a supercomputer capable of an Rmax (maximum  range) of 2.566 petaFLOPS; that is, over 2½ quadrillion (thousand  million million) floating point operations per second, or FLOPS. Located  at the National Supercomputing Center in Tianjin, China, it is  currently the fastest supercomputer in the world and one of the few  Petascale supercomputers in the world.
In October 2010, an upgraded version of the machine (Tianhe-1A) overtook  ORNL's Jaguar to become the world's fastest supercomputer, with a peak  computing rate of 2.507 petaFLOPS.
Both the original Tianhe-1 and Tianhe-1A use a Linux-based operating system
Source:- http://en.wikipedia.org/wiki/Tianhe-I 
 
