JMA Cray XC50

Also known as JMA tenth-generation computer; JMA main and sub Cray XC50

Operated by Japan Meteorological Agency at Japan Meteorological Agency (Tokyo) .

Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1263 of 1345 systems have a readable citation that names them, and 56 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.

Measured performance

Rmax: 5.73 PFlop/s
Rpeak: 9.13 PFlop/s
Rmax ÷ Rpeak: 62.8%
Cores: 135,792
Power: 1.35 MW
Per watt: 4.2 GF/W

Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.

What this machine is made of

One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.

Role	Part	Supplier at build	Quantity	Confidence	Source
Integrator	- Cray XC50 main system and subsystem	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	jma.go.jp top500.org
Integrator	- Hitachi was prime contractor and system integrator	Hitachi 6501TSE	-	Reported	top500.org
CPU	Intel Xeon Platinum 8160 CPUs x86-64 · 24C · 2.1 GHz · 14 nm · 150 W Intel Xeon Platinum 8160 24C 2.1GHz	Intel INTCNASDAQ	-	Reported	jma.go.jp top500.org
Interconnect	Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Cray Aries interconnect	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	top500.org
Operating system	Cray Linux Environment Operating systems Linux, Cray-customised · Proprietary layer over open-source Linux Cray Linux Environment 6.0	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	jma.go.jp

The read

The Japan Meteorological Agency tenth-generation computer: two independent Cray XC50 systems, a main system and a subsystem, each on Intel Xeon Platinum 8160 24-core 2.1 GHz processors over Aries with the Cray Linux Environment. JMA states the XC50 has been in operation since 5 June 2018 and gives a theoretical peak of 9,083 TFlop/s per system (2,741 extreme-scalability nodes plus smaller node pools). TOP500 lists both halves as separate entries (systems 179414 and 179415, 135,792 cores each, Rmax 5.73 PFlop/s, Rpeak 9.13 PFlop/s, 1,354 kW), first at rank 25 and 26 on the June 2018 list and last at rank 135 and 136 on the November 2023 list; this row records one half. The TOP500 news item of May 2018 says Hitachi was prime contractor and integrator for the two Cray systems. JMA PRIMEHPC FX1000 (already in this dataset) began operation in March 2023 as the next generation; no retirement date for the XC50 was found, so it is recorded as operational at its last TOP500 appearance.

Timeline

2018-06-05 First operational source

Site & facility

Japan Meteorological Agency (Tokyo)

Location: Tokyo, Japan
Commissioned: 2022

top500.org info.archives.global.fujitsu

Change history

2026-10-09 Added JMA Cray XC50

Source check

We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.

Every source cited on this page was readable, and none of them mentions this system. They are cited at page granularity, normally because no stable deep link could be found. That is a real weakness in this row and it is why the system carries a confidence tier below verified. See how this check works.

Cited source	Result	Found on the page
top500.org	does not name this system	Intel Xeon Platinum 8160, Cray Aries, Cray Linux Environment
jma.go.jp	does not name this system	-

Checked 2026-10-13 by pnpm verify. Re-run it and the table changes with the web.