Mitsuo Yokokawa

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RIKEN and Fujitsu have been working together to develop the K computer, with the aim of beginning shared use by the fall of 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). Since the K computer involves over 80 000 compute nodes, building(More)
We succeeded in getting 14.9 TFLOPS performance when running a plasma simulation code IMPACT-3D parallelized with High Performance Fortran on 512 nodes of the Earth Simulator. The theoretical peak performance of the 512 nodes is 32 TFLOPS, which means 45% of the peak performance was obtained with HPF. IMPACT-3D is an implosion analysis code using TVD(More)
The high-resolution direct numerical simulations (DNSs) of incompressible turbulence with numbers of grid points up to 4096<sup>3</sup> have been executed on the Earth Simulator (ES). The DNSs are based on the Fourier spectral method, so that the equation for mass conservation is accurately solved. In DNS based on the spectral method, most of the(More)
A spectral atmospheric general circulation model called AFES (AGCM for Earth Simulator) was developed and optimized for the architecture of the Earth Simulator (ES). The ES is a massively parallel vector supercomputer that consists of 640 processor nodes interconnected by a single stage crossbar network with its total peak performance of 40.96 Tflops. The(More)
Advanced Institute for Computational Science (AICS) was created in July 2010 at RIKEN under the supervision of Japanese Ministry of Education, Culture, Sports, Science, and Technology (MEXT) in order to establish the national center of excellence (COE) for high-performance computing and to operate the 10 petaflops class supercomputer called "K",(More)
Real space DFT (RSDFT) is a simulation technique most suitable for massively-parallel architectures to perform first-principles electronic-structure calculations based on density functional theory. We here report unprecedented simulations on the electron states of silicon nanowires with up to 107,292 atoms carried out during the initial performance(More)
The K computer is a distributed memory super-computer system consisting of more than 800 compute nodes which is being developed by RIKEN as a Japanese national project. Its performance is aimed at achieving 10 peta-flops sustained in the LINPACK benchmark. The system is under installation and adjustment. The whole system will be operational in 2012.
All electron calculations were performed on the photosynthetic reaction center of Blastochloris viridis, using the fragment molecular orbital (FMO) method. The protein complex of 20,581 atoms and 77,754 electrons was divided into 1398 fragments, and the two-body expansion of FMO/6-31G* was applied to calculate the ground state. The excited electronic states(More)