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Gyoukou

Gyoukou is a supercomputer developed by ExaScaler and PEZY Computing, based around ExaScaler's ZettaScaler immersion cooling system.

System
Gyoukou is based on ExaScaler's ZettaScaler-2.x technology which features liquid immersion cooling system using Fluorinert. Each immersion tank can contain 16 Bricks. A Brick consists of a backplane board, 32 PEZY-SC2 modules, 4 Intel Xeon D host processors, and 4 InfiniBand EDR cards. Modules inside a Brick are connected by hierarchical PCI Express fabric switches, ==Performance==
Performance
With partial configuration, Gyoukou was ranked 69th at 1,677.1 teraflops on the June 2017 TOP500 ranking. After upgrade to full scale (equivalent of 19.5 immersion tanks) using newer ZettaScaler-2.2 system, it ranked 4th at 19,135.8 teraflops on the November 2017 TOP500 ranking. At the time of benchmarking, 1984 out of 2048 cores of each PEZY-SC2 were used at 700 MHz clock. at the time benchmarked as 19,860,000 "cores" (after an upgrade). ==Notes==
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