is a supercomputer developed by and

PEZY Computing PEZY Computing is a Japanese fabless computer chip design company specialising in the design of manycore processors for supercomputers. History PEZY Computing was founded in 2010. The company's first manycore processor the PEZY-1 was launched in ...

, based around ExaScaler's ZettaScaler immersion cooling system. It was deployed at the

Japan Agency for Marine-Earth Science and Technology Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

(JAMSTEC) Yokohama Institute for Earth Sciences, the same floor where the

Earth Simulator The is a series of supercomputers deployed at Japan Agency for Marine-Earth Science and Technology Yokohama Institute of Earth Sciences. Earth Simulator (first generation) The first generation of Earth Simulator, developed by the Japanese go ...

is located. Amid the scandal regarding the development grant, it was removed from JAMSTEC in April 2018.

System

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

Fluorinert Fluorinert is the trademarked brand name for the line of electronics coolant liquids sold commercially by 3M. As perfluorinated compounds (PFCs), all Fluorinert variants have an extremely high Global Warming Potential (GWP), so should be used wit ...

. Each immersion tank can contain 16 ''Bricks''. A Brick consists of a backplane board, 32

PEZY-SC2 PEZY Computing is a Japanese fabless computer chip design company specialising in the design of manycore processors for supercomputers. History PEZY Computing was founded in 2010. The company's first manycore processor the PEZY-1 was launched i ...

modules, 4 Intel Xeon D host processors, and 4

InfiniBand InfiniBand (IB) is a computer networking communications standard used in high-performance computing that features very high throughput and very low latency. It is used for data interconnect both among and within computers. InfiniBand is also use ...

EDR cards. Modules inside a Brick are connected by hierarchical PCI Express fabric switches, and the Bricks are interconnected by InfiniBand. Each PEZY-SC2 module contains 2048 processing elements (1 GHz design), six MIPS64 control processors, and 4

DDR4 Double Data Rate 4 Synchronous Dynamic Random-Access Memory (DDR4 SDRAM) is a type of synchronous dynamic random-access memory with a high bandwidth (" double data rate") interface. Released to the market in 2014, it is a variant of dynamic ra ...

DIMM A DIMM () (Dual In-line Memory Module), commonly called a RAM stick, comprises a series of dynamic random-access memory integrated circuits. These memory modules are mounted on a printed circuit board and designed for use in personal computers ...

s (64GB per module as of November 2017).

Performance

With partial configuration, Gyoukou was ranked 69th at 1,677.1 teraflops on the June 2017

TOP500 The TOP500 project ranks and details the 500 most powerful non- distributed computer systems in the world. The project was started in 1993 and publishes an updated list of the supercomputers twice a year. The first of these updates always coinci ...

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. Gyoukou has high energy efficiency, and it ranked 5th at 14.173 gigaflops/watt on the November 2017

Green500 The Green500 is a biannual ranking of supercomputers, from the TOP500 list of supercomputers, in terms of energy efficiency. The list measures performance per watt using the TOP500 measure of high performance LINPACK benchmarks at double-precisi ...

energy efficiency ranking. at the time benchmarked as 19,860,000 "cores" (after an upgrade).

Notes

External links

ExaScaler Inc.

PEZY Computing K.K.
* {{youtube, _-z8ErBlBSo, Gyoukou Supercomputer leveraging 48V Factorized Power Supercomputers Supercomputing in Japan Japan Agency for Marine-Earth Science and Technology