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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