November 2011

Japan’s “K Computer” maintained its position atop the newest edition of the TOP500 List of the world’s most powerful supercomputers, thanks to a full build-out that makes it four times as powerful as its nearest competitor. Installed at the RIKEN Advanced Institute for Computational Science (AICS) in Kobe, Japan, the K Computer it achieved an impressive 10.51 Petaflop/s on the Linpack benchmark using 705,024 SPARC64 processing cores.

The K Computer is the first supercomputer to achieve a performance level of 10 Petaflop/s, or 10 quadrillion calculations per second. In June 2011, the partially built K computer had taken the No. 1 position with a performance of 8.16 Petaflop/s. Contrary to many other recent very large systems, it does not utilize graphics processors or other accelerators. The K Computer is also one of the most energy efficient systems on the list.

Still in second place is the Chinese Tianhe-1A system with 2.57 Petaflop/s performance. One year ago, the Tianhe-1A system took the top spot, but was dethroned when the next TOP500 list was published six months ago.

In fact, the Top 10 supercomputers on the latest list – the 38th edition of the twice-yearly list – remain unchanged from June 2011. The latest list, the data behind it and the trends it reflects will be the topic of a Birds-of-a-Feather session to be held at 5:30 p.m. Tuesday, Nov. 15, at the SC11 supercomputing conference in Seattle.

“This is the first time since we began publishing the list back in 1993 that the top 10 systems showed no turnover,” said TOP500 editor Erich Strohmaier, who will lead the discussion at SC11.

The largest U.S. system is a Cray XT5 system called Jaguar and installed at the Oak Ridge National Laboratory, with a 1.75 Petaflop/s performance running the standard Linpack benchmark application. Other top U.S. systems include Cielo, a Cray XE6 at Los Alamos National Laboratory (No. 6); Pleiades, an SGI Altix machine at NASA’s Ames Research Center (No.7); Hopper, a Cray XE6 at the National Energy Research Scientific Computing Center (No. 8); and Roadrunner, an IBM system that was the first ever to break the Petaflop/s barrier, at Los Alamos (No. 10). Systems in China, Japan and France round out the Top 10.

TOP 10 Sites for November 2011

For more information about the sites and systems in the list, click on the links or view the complete list.

Rank Site System Cores Rmax (TFlop/s) Rpeak (TFlop/s) Power (kW)
1 RIKEN Advanced Institute for Computational Science (AICS)
K computer, SPARC64 VIIIfx 2.0GHz, Tofu interconnect
705024 10510.0 11280.4 12660
2 National Supercomputing Center in Tianjin
Tianhe-1A - NUDT YH MPP, Xeon X5670 6C 2.93 GHz, NVIDIA 2050
186368 2566.0 4701.0 4040
3 DOE/SC/Oak Ridge National Laboratory
United States
Jaguar - Cray XT5-HE Opteron 6-core 2.6 GHz
Cray Inc.
224162 1759.0 2331.0 6950
4 National Supercomputing Centre in Shenzhen (NSCS)
Nebulae - Dawning TC3600 Blade System, Xeon X5650 6C 2.66GHz, Infiniband QDR, NVIDIA 2050
120640 1271.0 2984.3 2580
5 GSIC Center, Tokyo Institute of Technology
TSUBAME 2.0 - HP ProLiant SL390s G7 Xeon 6C X5670, Nvidia GPU, Linux/Windows
73278 1192.0 2287.6 1399
United States
Cielo - Cray XE6, Opteron 6136 8C 2.40GHz, Custom
Cray Inc.
142272 1110.0 1365.8 3980
7 NASA/Ames Research Center/NAS
United States
Pleiades - SGI Altix ICE 8200EX/8400EX, Xeon HT QC 3.0/Xeon 5570/5670 2.93 Ghz, Infiniband
111104 1088.0 1315.3 4102
United States
Hopper - Cray XE6, Opteron 6172 12C 2.10GHz, Custom
Cray Inc.
153408 1054.0 1288.6 2910
9 Commissariat a l'Energie Atomique (CEA)
Tera-100 - Bull bullx super-node S6010/S6030
Bull SA
138368 1050.0 1254.5 4590
United States
Roadrunner - BladeCenter QS22/LS21 Cluster, PowerXCell 8i 3.2 Ghz / Opteron DC 1.8 GHz, Voltaire Infiniband
122400 1042.0 1375.8 2345

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