|
The K computer – named for the Japanese word , meaning 10 quadrillion (1016)〔〔See Japanese numbers〕 – is a supercomputer manufactured by Fujitsu, currently installed at the RIKEN Advanced Institute for Computational Science campus in Kobe, Japan.〔(【引用サイトリンク】title=Supercomputer "K computer" Takes First Place in World )〕 The K computer is based on a distributed memory architecture with over 80,000 computer nodes.〔("The K computer: Japanese next-generation supercomputer development project" ). IEEE Xplore. 2011. Retrieved 30 January 2013.〕 It is used for a variety of applications, including climate research, disaster prevention and medical research.〔 The K computer's operating system is based on the Linux kernel, with additional drivers designed to make use of the computer's hardware.〔(Moroo et al. (2012) Operating System for the K computer ). Fujitsu. Retrieved 18 June 2013.〕 In June 2011, TOP500 ranked K the world's fastest supercomputer, with a computation speed of over 8 petaflops, and in November 2011, K became the first computer to top 10 petaflops.〔("Japan Reclaims Top Ranking on Latest TOP500 List of World’s Supercomputers" ). TOP500. Retrieved 20 June 2011.〕〔 It had originally been slated for completion in June 2012.〔 In June 2012, K was superseded as the world's fastest supercomputer by the American IBM Sequoia;〔(【引用サイトリンク】title=IBM supercomputer overtakes Fujitsu as world's fastest )〕 and as of November 2014, K is the world's fourth-fastest computer. ==Performance== On 20 June 2011, the TOP500 Project Committee announced that K had set a LINPACK record with a performance of 8.162 petaflops, making it the fastest supercomputer in the world at the time;〔〔(【引用サイトリンク】title=Supercomputer "K computer" Takes First Place in World )〕〔("K computer, SPARC64 VIIIfx 2.0GHz, Tofu interconnect" ). TOP500. Retrieved 20 June 2011.〕 it achieved this performance with a computing efficiency ratio of 93.0%. The previous record holder was the Chinese National University of Defense Technology's Tianhe-1A, which performed at 2.507 petaflops.〔 The TOP500 list is revised semiannually, and the rankings change frequently, indicating the speed at which computing power is increasing.〔 In November 2011, RIKEN reported that K had become the first supercomputer to exceed 10 petaflops, achieving a LINPACK performance of 10.51 quadrillion computations per second with a computing efficiency ratio of 93.2%.〔("K computer" Achieves Goal of 10 Petaflops" ). Fujitsu. 2 November 2011. Retrieved 10 November. 2011.〕 K received top ranking in all four performance benchmarks at the 2011 HPC Challenge Awards. On 18 June 2012, the TOP500 Project Committee announced that the California-based IBM Sequoia supercomputer had replaced K as the world's fastest supercomputer, with a LINPACK performance of 16.325 petaflops. Sequoia is 55% faster than K, utilising 123% more CPU processors, but is also 150% more energy efficient.〔 As of June 2013, the world's fastest supercomputer is China's Tianhe-2, capable of a LINPACK performance of over 33 petaflops; K is currently the world's fourth-fastest computer. K computer holds second place in perspective HPCG test proposed by Jack Dongarra, with 0.427 HPCG PFLOPS in June 2014. 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「K computer」の詳細全文を読む スポンサード リンク
|