A supercomputer built by the Chinese government has retained its place at the top of a list of the world's most powerful systems, the BBC reports. Tianhe-2 can operate at 33.86 petaflop/s - the equivalent of 33,863 trillion calculations per second - according to a test called the Linpack benchmark. There was only one change near the top of the leader board. Switzerland's new Piz Daint - with 6.27 petaflop/s - made sixth place. The Top500 list is compiled twice-yearly by a team led by a professor from Germany's University of Mannheim...

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