Gyoukou (Japanese: 暁光, Hepburn: gyōkō, dawn light) is a supercomputer developed by ExaScaler [ja] and PEZY Computing, based around ExaScaler's ZettaScaler immersion cooling system.
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.[5] Modules inside a Brick are connected by hierarchical PCI Express fabric switches,[3] and the Bricks are interconnected by InfiniBand.
Each PEZY-SC2 module contains 2048 processing elements (1 GHz design), six MIPS64 control processors, and 4 DDR4DIMMs (64GB per module as of November 2017).[5][6]
Performance
With partial configuration, Gyoukou was ranked 69th at 1,677.1 teraflops on the June 2017 TOP500 ranking.[5][7]
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.[8] At the time of benchmarking, 1984 out of 2048 cores of each PEZY-SC2 were used at 700 MHz clock.[5]
Gyoukou has high energy efficiency, and it ranked 5th at 14.173 gigaflops/watt on the November 2017 Green500 energy efficiency ranking.[9] at the time benchmarked as 19,860,000 "cores" (after an upgrade).[10]
