At the HPC in Asia Workshop during ISC 2017 in Frankfurt, Satoshi Matsuoka, Tokyo Tech, gave an overview of the HPC developments in Japan. In the current TOP500 list, there are currently two Japanese machines in the top10. The Oakforest-PACS at position 7, and the K computer at 8. But if you look at other lists, for instance the HPCG list, a Japanese machine, the K computer - is nr. 1 and another Japanese machine is nr. 4. If you look at the Green500 again a Japanese machine, the TSUBAME 3.0 is nr. 1. In fact, the first 4 places on the TOP500 are for Japanese machines. These machines are, to some degree, AI focused machines. So the most efficient machines in Japan, in terms of Green are not real HPC machines, but are AI/Big Data systems.
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