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The 6-dimensional mesh/torus topography is described by Fujitsu:
"The design of the 6-dimensional mesh/torus topology in the K computer means there are many communication routes between neighboring CPUs. This enables the execution of data communications between CPUs via the shortest route and over the shortest period of time and ensures the network can fully draw out this world top-class CPU computational power."
Here is China top supercomputer which was built in 2010 and is located at the National Supercomputing Center in Tianjin. China place second to the U.S. with 62 supercomputers on the Top 500 list.
The DOE/SC/Oak Ridge National Laboratory in Oak Ridge, Tenn. operates the third most powerful supercomputer and former No. 1, Jaguar. Ancient compared to the Japanese and Chinese best, the system was built in 2009. UT-Battelle, LLC operates this computer for the U.S. Department of Energy.
The U.S. did have five of the top ten supercomputers and dominated the list of the top 500.
To regain the world title, Oak Ridge National Laboratory is working on a $100 million Cray supercomputer called Titan. It's expected to exceed 20 petaflops when completed in 2012, although the first stage will be ready this year.