The Tianhe-2 supercomputer at China's National University of Defence Technology has topped the Top 500 list for supercomputers for the fifth consecutive time.
The report, which is released twice a year, said that the Tianhe-2 is currently the most powerful, followed by the US-developed Cray XK7 Titan.
Tianhe-2 uses Intel Xeon Phi processors to generate 33.86 petaflop/s (quadrillions of calculations per second) as measured by the Linpack benchmark, while the US Department of Energy's machine, which is credited with energy efficiency, achieved 17.59 petaflop/s.
The authors of the Top 500 supercomputer list said that performance gains have slowed since 2013. Nine of the top 10 machines have been around for two years or more.
"Total combined performance of all 500 systems has grown to 363 petaflop/s, compared to 309 petaflop/s last November and 274 petaflop/s one year ago," said the report.
"This increase in installed performance also exhibits a noticeable slowdown in growth compared to the previous long-term trend."
Just one new machine broke the top 10, the Cray Shaheen II, which at 5.536 petaflop/s gave the King Abdullah University of Science and Technology in Saudi Arabia seventh place.
Dan Reed, from the University of Iowa, suggested that the list is dominated by big spenders.
The US accounts for 233 of the top 500 supercomputers, but its share of the table is down from 265 machines in November 2013.
Despite its top position China takes only 37 slots, half as many as it had a year ago. Europe increased its share by 11 to 141.
HP takes the title for most used hardware in the list at 35 percent, while Cray leads in terms of performance with 24 percent of the total. HP has 178 systems in the list, while IBM has 111.
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