Riken and Fujitsu have taken first place on the 37th TOP500 list announced at the 26th International Supercomputing Conference (ISC’11) held in Hamburg, Germany. The ranking is based on a performance measurement of the “K computer,” currently under their joint development.

The TOP500-ranked K computer system, currently in the configuration stage, has 672 computer racks equipped with a current total of 68 544 CPUs. This half-build system achieved the world’s best Linpack benchmark performance of 8.162 petaflops (quadrillion floating-point operations per second), to place it at the head of the TOP500 list.
In addition, the system has recorded high standards with a computing efficiency ratio of 93%. This is the first time since June 2004 that the Japanese supercomputer “Earth Simulator” has been ranked first on the TOP500 list.
Riken and Fujitsu have been working together to develop the K computer, with the aim of beginning shared use by November 2012, as a part of the High-Performance Computing Infrastructure (HPCI) initiative led by Japan’s Ministry of Education, Culture, Sports, Science and Technology (MEXT).
The K computer will consist of more than 800 computer racks, each equipped with ultrafast and energy-efficient CPUs, that access into a network capable of an immense amount of interconnectivity
To test the system’s performance at the configuration stage, the K computer’s processing speed was measured by the Linpack benchmark program, placing it on the 37th TOP500 ranking of the world’s fastest supercomputers. The TOP500 ranking list began in 1993 and is updated twice a year in June and November.