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Japan operates a number of centers for supercomputing which hold world records in speed, with the K computer becoming the world's fastest in June 2011.〔(【引用サイトリンク】title=Supercomputer "K computer" Takes First Place in World )〕 The K computer's performance is impressive, according to professor Jack Dongarra who maintains the TOP500 list of supercomputers, and it surpasses its next 5 competitors combined.〔 The K computer costs US$10 million a year to operate.〔 ==Previous records== Japan's entry into supercomputing started in the early 1980s. In 1982, Osaka University's LINKS-1 Computer Graphics System used up to 257 Zilog Z8001 microprocessors, mainly used for rendering realistic 3D computer graphics.〔http://museum.ipsj.or.jp/en/computer/other/0013.html〕 It was the world's most powerful computer, as of 1984.〔http://www.vasulka.org/archive/Writings/VideogameImpact.pdf#page=29〕 The SX-3 supercomputer family was developed by NEC Corporation and announced in April 1989.〔''Computing methods in applied sciences and engineering'' by R. Glowinski, A. Lichnewsky ISBN 0-89871-264-5 page 353-360〕 The SX-3/44R became the fastest supercomputer in the world in 1990. Fujitsu's Numerical Wind Tunnel supercomputer gained the top spot in 1993. The K computer's placement on the top spot is seven years after Japan held the title in 2004.〔〔 NEC's Earth Simulator supercomputer built by NEC at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) was the fastest in the world at that time. It used 5,120 NEC SX-6i processors, generating a performance of 28,293,540 MIPS (million instructions per second).〔http://www.jcmit.com/cpu-performance.htm〕 It also had a peak performance of 131 TFLOPS (131 trillion floating point operations per second), using proprietary vector processing chips. The K computer uses over 60,000 commercial scalar SPARC64 VIIIfx processors housed in over 600 cabinets. The fact that K computer is over 60 times faster than the Earth Simulator, and that the Earth Simulator ranks as the 68th system in the world 7 years after holding the top spot, demonstrates both the rapid increase in top performance in Japan and the widespread growth of supercomputing technology worldwide. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Supercomputing in Japan」の詳細全文を読む スポンサード リンク
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