Supercomputers/Systems/SORA-MA
Japan · operational · hpc
SORA-MA
Also known as JSS2 main system
Operated by JAXA at JAXA Chofu Aerospace Center .
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
- 3.16 PFlop/s
- Rpeak
- 3.48 PFlop/s
- Rmax ÷ Rpeak
- 90.8%
- Cores
- 110,160
- Power
- 1.65 MW
- Per watt
- 1.9 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 PRIMEHPC FX100, 3,240 nodes | Fujitsu | - | Reported | jss.jaxa.jptop500.org |
| CPU | - Fujitsu SPARC64 XIfx 32C 1.98GHz, one per node | Fujitsu | 3,240 reported | Reported | jss.jaxa.jptop500.org |
| Interconnect | - Tofu Interconnect 2 | Fujitsu | - | Reported | top500.org |
The read
The main computing system of JAXA Supercomputer System generation 2 (JSS2), a Fujitsu PRIMEHPC FX100 with SPARC64 XIfx processors on Tofu Interconnect 2. JAXA's JSS annual report lists 3,240 nodes (one 32-core CPU and 32 GB per node), water cooling and 3.49 PFlop/s peak after an April 2016 update, alongside the SORA-LM, SORA-PP and SORA-FS support systems. TOP500 lists 110,160 cores, Rmax 3.16 PFlop/s, Rpeak 3.48 PFlop/s and 1,652.4 kW; it first appeared in June 2015 and ranked 24th in June 2016, last appearing in November 2020 at rank 99. Fujitsu's April 2020 order announcement describes the successor FX1000 system (TOKI-SORA, already in the register) as scheduled to start in October 2020 at about 5.5 times the performance.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Change history
- 2026-10-07 Added SORA-MA, the JAXA JSS2 main system
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.
| Cited source | Result | Found on the page |
|---|---|---|
| top500.org | names system only | - |
| jss.jaxa.jp | names system only | - |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.