First-principles calculations of electron states of a silicon nanowire with 100,000 atoms on the K computer

Authors:
Yukihiro Hasegawa;Jun-Ichi Iwata;Miwako Tsuji;Daisuke Takahashi;Atsushi Oshiyama;Kazuo Minami;Taisuke Boku;Fumiyoshi Shoji;Atsuya Uno;Motoyoshi Kurokawa;Hikaru Inoue;Ikuo Miyoshi;Mitsuo Yokokawa
Affiliations:
Next-Generation Supercomputer R&D Center, Riken;University of Tsukuba;University of Tsukuba;University of Tsukuba;The University of Tokyo;Next-Generation Supercomputer R&D Center, Riken;University of Tsukuba;Next-Generation Supercomputer R&D Center, Riken;Next-Generation Supercomputer R&D Center, Riken;Next-Generation Supercomputer R&D Center, Riken;Technical Computing Solution Unit, Fujitsu Limited;Next Generation Technical Computing Unit, Fujitsu Limited;Next-Generation Supercomputer R&D Center, Riken
Venue:
Proceedings of 2011 International Conference for High Performance Computing, Networking, Storage and Analysis
Year:
2011

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Abstract

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 evaluation phase of the K computer being developed at RIKEN. The RSDFT code has been parallelized and optimized so as to make effective use of the various capabilities of the K computer. Simulation results for the self-consistent electron states of a silicon nanowire with 10,000 atoms were obtained in a run lasting about 24 hours and using 6,144 cores of the K computer. A 3.08 peta-flops sustained performance was measured for one iteration of the SCF calculation in a 107,292-atom Si nanowire calculation using 442,368 cores, which is 43.63% of the peak performance of 7.07 peta-flops.