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Tokyo Tech GSIC Group Wins Gordon Bell Award


Special Achievement Award at ACM/IEEE Supercomputing Conference 2011

The Gordon Bell Prize Special Achievements in Scalability and Time-to-Solution§ presented at the 2011 ACM/IEEE Supercomputing Conference in Seattle was awarded to Professor Aoki's group of the Global Scientific Information Computing Center (GSIC) at Tokyo Institute of Technology for their achievement of 2.0-Petaflops performance for a practical application in single precision. Their computation is applied to the dendritic solidification process of an alloy by solving the Phase-Field model§§ and is well suited to the development of new materials. The computational domain is divided into a mesh and solved using the finite difference method, which is a mesh computation. Although achieving high performance for such applications has been difficult, they achieved an extremely high performance of 44.5% (peak 2.4 Petaflops in double precision and 4.8 in single precision) on the TSUBAME2.0 supercomputer comprising more than 4000 GPUs (Graphics Processing Units) at GSIC.


Paper title: Peta-scale Phase-Field Simulation for Dendritic Solidification on the TSUBAME 2.0 Supercomputer
Winners: Takashi Shimokawabe*, Takayuki Aoki**, Tomohiro Takaki***, Akinori Yamanaka****, Akira Nukada**, Toshio Endo**, Naoya Maruyama**, Satoshi Matsuoka**
  * Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  ** Global Scientific Information and Computing Center, Tokyo Institute of Technology
  *** Graduate School of Science and Technology, Kyoto Institute of Technology
  **** Graduate School of Engineering, Tokyo Institute of Technology



Snapshot of dendritic solidification of Al-Si binary alloy



§The Gordon Bell Awards:

A set of awards awarded by the Association for Computing Machinery (ACM) each year at the Supercomputing Conference to recognize outstanding achievement in high-performance computing applications. The main purpose of the awards is to acknowledge, reward, and thereby assess the progress of parallel computing. The Special Achievement is awarded to the entry that best utilizes innovative techniques to produce new levels of performance for practical applications.

§§ Phase-Field Model: The phase-field model is a physical theory describing the evolution of complicated material morphologies on a meso-scale between the size of a quantity of atoms and of materials in product measurements. It is a powerful numerical tool for studying phase transformations such as solidification. However, it remains restricted to two- or small three-dimensional computations due to its large computational cost. Realistic prediction of a solidification microstructure requires a mm-scale simulation heretofore impossible with the previous supercomputers.

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