Japan · decommissioned · hpc

JSS FX1

Also known as JAXA Supercomputer System (JSS1) Fujitsu FX1

Operated by JAXA .

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: 1092 of 1153 systems have a readable citation that names them, and 40 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: 110.60 TFlop/s
Rpeak: 121.28 TFlop/s
Rmax ÷ Rpeak: 91.2%
Cores: 12,032
Power: 1.02 MW
Per watt: 0.1 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	- Fujitsu FX1 technical computing server, 3,392 nodes (3,008 in the benchmark run)	Fujitsu 6702TSE	-	Verified	top500.org info.archives.global.fujitsu
CPU	- Fujitsu SPARC64 VII 4C 2.52GHz, 3,008 CPUs in the benchmark run	Fujitsu 6702TSE	3,008 reported	Verified	top500.org info.archives.global.fujitsu
Interconnect	Mellanox InfiniBand DDR Interconnect Fat tree · 20 Gb/s per 4x port · About 2 microseconds InfiniBand DDR	NVIDIA NVDANASDAQ	-	Reported	top500.org

The read

The core of JAXA's first integrated JAXA Supercomputer System (JSS), which merged the former ISAS, NAL and NASDA machines: a Fujitsu FX1 of SPARC64 VII 2.52 GHz quad-core processors on InfiniBand DDR. TOP500 lists 12,032 cores, 110.6 TFlop/s Rmax, 121.28 TFlop/s Rpeak and 1,020 kW, 60th on the November 2010 list after debuting 28th in June 2009. Fujitsu's own press release independently gives operation from 1 April 2009, 3,008 benchmarked nodes (3,392 in the full system), 12,032 cores, 110.6 TFlop/s Linpack and a theoretical peak that Fujitsu states as 135 TFlop/s for the whole system. Status as of is the last TOP500 list it appeared on (June 2013); JAXA's later systems are TOKI-SORA (JSS3) in this dataset. The Chofu or Sagamihara machine room is not named on a page fetched, so no site is recorded.

Timeline

2009-04 First operational source
2010-11 List debut at #60 (November 2010) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#60: TOP500, November 2010 →

Change history

2026-10-02 Added JAXA's first JSS Fujitsu FX1

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
info.archives.global.fujitsu	does not name this system	-
top500.org	does not name this system	Mellanox InfiniBand DDR

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.