Gyoukou

Gyoukou (Japanese: 暁光, Hepburn: gyōkō, dawn light) is a supercomputer developed by ExaScaler and PEZY Computing, based around ExaScaler's ZettaScaler immersion cooling system.

Gyoukou
Activeoperational 2017
LocationJAMSTEC Earth Simulator Building
Architecture10,000 PEZY-SC2 processor modules (2048 processing elements per module; 20,480,000 total), 1250 Intel Xeon D host processors
Power1350 kW
Operating systemLinux CentOS
Memory680 TiB
Speed19.14 PFLOPS (Rmax)
RankingTOP500: 4, November 2017

It was deployed at the Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Yokohama Institute for Earth Sciences, the same floor where the Earth Simulator is located. Amid the scandal regarding the development grant, it was removed from JAMSTEC in April 2018.[1][2]

System

Gyoukou is based on ExaScaler's ZettaScaler-2.x technology which features liquid immersion cooling system using Fluorinert.[3][4]

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 InfiniBands.

Each PEZY-SC2 module contains 2048 processing elements (1 GHz design), six MIPS64 control processors, and 4 DDR4 DIMMs (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]

Notes
  1. スパコン「暁光」撤去へ　20ペタFLOP達成、世界3位相当の性能. ITmedia. 13 April 2018. Retrieved 8 April 2020.
  2. Ando, Hisa (6 July 2018). 第51回のTop500は米国のSummitが中国から首位を奪回 (in Japanese). Mynavi. Retrieved 8 April 2020.
  3. "ZettaScaler-2.0 Configurable Liquid Immersion Cooling System" (PDF). ExaScaler. Retrieved November 23, 2017.
  4. "Archived copy" 液体直接浸漬冷却システムのキーマテリアルである３Ｍのフッ素系液体「TOP500」で日本製スーパーコンピュータ最高の4位を獲得した「暁光（Gyoukou）」の冷却システムに採用さらに「GREEN500」では、採用システムがトップ3を独占 (PDF) (in Japanese). 3M. November 15, 2017. Archived from the original (PDF) on December 1, 2017. Retrieved November 23, 2017.CS1 maint: archived copy as title (link)
  5. スーパーコンピュータシステム「Gyoukou（暁光）」がスパコンランキングTOP500で国内1位（世界4位）・Green500で世界5位を同時に獲得 (PDF) (in Japanese). ExaScaler. November 14, 2017. Retrieved November 23, 2017.
  6. PEZY-SC2モジュール&プロセッサ (in Japanese). PEZY Computing. Retrieved November 23, 2017.
  7. "Top500 List - June 2017". TOP500.org. Retrieved November 23, 2017.
  8. "Top500 List - November 2017". TOP500.org. Retrieved November 23, 2017.
  9. "Green500 List for November 2017". TOP500.org. Retrieved November 23, 2017.
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