Special K
June 23, 2011
No, this article isn't about
ketamine hydrochloride, sometimes called "Special K;" nor is it about the
breakfast cereal that gave me super powers when I was a youth. It's about the
fastest computer in the world, at least for the present. This is the
K Computer of the
RIKEN Advanced Institute for Computational Science,
Kobe, Japan, which is rated at eight
petaflops, or the equivalent performance of about a million
desktop computers.[1-5] The "K" designation comes from the Japanese word, "
Kei," for ten
quadrillion, or ten times 10
15, the 2012 target for the number of
floating point operations per second for this computer.[4]
Some news stories are
periodic. You can be sure of the typical
tax stories around the mid-April filing deadline. In the days when people actually mailed their tax forms, there was obligatory video of people in line at the
post office waiting to get their deadline postmark. It was likewise a tradition in
New Jersey, where I live, to see annual spring video of people in
row boats on the main streets of their just
flooded towns.
Supercomputer stories are periodic, also. There will always be another, faster computer. One popular exhortation is to be wary of the computing
gap between the US and other countries; and, yes, supercomputers
predict the weather, but they are used also in weapons design. Less attention is given to the fact that without a corp of capable
programmers, these newer computers may only execute programs as well as the ones that they replaced.
Cray-1 supercomputer on display at the École polytechnique fédérale de Lausanne, Lausanne, Switzerland.
The Cray-1 benchmarked at just 80 megaflop/sec.
(Via Wikimedia Commons)
Supercomputers rankings are posted in the periodically updated
TOP500 List of the fastest supercomputers. The
37th edition of this list was released on June 20, 2011, at the
2011 International Supercomputing Conference in
Hamburg, Germany.[1] The rating is impartially determined by the speed of execution of the
Linpack benchmark that I wrote about in a
previous article (Benchmarks, November 17, 2010).
The TOP500 list is updated every six months. It's compiled by computer scientists at the
University of Tennessee, the
National Energy Research Scientific Computing Center at
Lawrence Berkeley National Laboratory, and the
University of Mannheim.[4] Jack Dongarra, a professor of
electrical engineering and computer science at the University of Tennessee, maintains the database.[3]
Perhaps more significant than who won first place is the fact that all computers in the top ten achieved petaflop performance for the first time. Here's the current top ten list:[1]
| Name | Petaflop/s | Organization |
| 1. | K Computer | 8.2 | RIKEN Advanced Institute for Computational Science, Kobe, Japan |
| 2. | Tianhe-1A | 2.6 | National Supercomputing Center, Tianjin, China |
| 3. | Cray Jaguar | 1.75 | U.S. Department of Energy, Oak Ridge National Laboratory |
| 4. | Nebulae | 1.27 | National Supercomputing Center, Shenzen, China |
| 5. | Tsubame 2.0 | 1.19 | Tokyo Institute of Technology, Tokyo, Japan |
| 6. | Cray Cielo | 1.11 | Los Alamos National Laboratory, Los Alamos, New Mexico |
| 7. | Pleiades | 1.09 | NASA Ames Research Center, Moffett Field, California |
| 8. | Hopper | 1.054 | DOE National Energy Research Scientific Computing Center, Oakland, California |
| 9. | Tera 100 | 1.05 | Commissariat à l'énergie atomique et aux énergies alternatives, Essonne, France |
| 10. | Roadrunner | 1.04 | Los Alamos National Laboratory, Los Alamos, New Mexico |
There's been much press about using
Graphics processing unit (GPU) chips in computing applications. The Tianhe-1A is built from
NVIDIA GPU chips, and nineteen systems on the TOP500 list use GPU chips. The K Computer, which was built by Fujitsu, is composed of 68,544 "traditional" CPU chips, the eight
core SPARC64 VIIIfx. This results in a computer with a phenomenal 548,352 cores, which is nearly twice the number of any other supercomputer in the TOP500 list. The
Japanese government has invested about $1.25 billion in the K Computer project as it attempts to position Japan as the world supercomputer leader.[4]
The particular SPARC chips manufactured by
Fujitsu run at 2
GHz. The basic module from which the K Computer is built is a four CPU, water-cooled
blade server with 512 gigaflop double-precision floating point capability. The K Computer uses a
torus network architecture described previously by Fujitsu.[5]
Notable is the fact that, although the K Computer was designed to be
energy-efficient, it still consumes 9.89
megawatts! Energy consumption is becoming an important factor in supercomputing. Twenty-nine of the 500 listed computers consume more than a megawatt of power each.[1] The average power consumption of computers on the top ten list is 4.3 megawatts, which is much higher than the 3.2 megawatts of the last list, published six months ago.[1] A megawatt translates to hundreds of dollars per hour operating cost; and this figure doesn't include necessary
cooling systems.
There's no
economic slowdown in the supercomputing arena. The total computing capacity of the present TOP500 list is 58.88 petaflops, an increase of 34.7% from November 2010, and an increase of 81.7% per cent from June, 2010.[5] The present list averages 15,550 cores per system, which is up from 13,071 in November, 2010, and 10,267 in June, 2010.[1]
The US is losing its supercomputing lead. At 256, it has just a few more than half of the present top 500 supercomputers, which is down from 274 last November.
China has 62,
Germany has 30, the
United Kingdom has 27,
Japan has 26, and
France has 25.[5]
References:
- Erich Strohmaier, "Japan Reclaims Top Ranking on Latest TOP500 List of World's Supercomputers," TOP500 Press Release, June 16, 2011.
- Verne G. Kopytoff, "Japanese 'K' Computer Is Ranked Most Powerful," The New York Times, June 19, 2011.
- Tom Chivers, "Japanese supercomputer 'K' is world's fastest," Telegraph (UK), June 20, 2011.
- Daisuke Wakabayashi, "Japanese Supercomputer Claims World's Top Spot," Wall Street Journal, June 20, 2011.
- Timothy Prickett Morgan, "Japan takes the Top 500 lead with K super - The mother of all Sparc systems," Register (UK), June 20, 2011.
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