Jeff Nichols, associate director for computing and computational sciences at Oak Ridge National Laboratory, in front of Titan, which was the world’s fastest supercomputer in November 2012 but is now ranked No. 2. (Photos courtesy of ORNL/File photo October 2013)

For the fifth consecutive time, Tianhe-2, a supercomputer developed by China’s National University of Defense Technology, has retained its position as the world’s number one system, according to the 45th edition of the twice-yearly TOP500 list of the world’s most powerful supercomputers. Tianhe-2, which means Milky Way-2, led the list with a performance of 33.86 petaflop/s (or quadrillions of calculations per second) on the Linpack benchmark.

At number two was Titan, a Cray XK7 system installed at the U.S. Department of Energy’s Oak Ridge National Laboratory. Titan, the top system in the United States and one of the most energy-efficient systems on the list, achieved 17.59 petaflop/s on the Linpack benchmark.

The only new entry in the Top 10 supercomputers on the latest list is at number seven—Shaheen II is a Cray XC40 system installed at King Abdullah University of Science and Technology, or KAUST, in Saudi Arabia. Shaheen II achieved 5.536 petaflop/s on the Linpack benchmark, making it the highest-ranked Middle East system in the 22-year history of the list and the first to crack the Top 10. [Read more…]