Supercomputers/Systems/Tera-1000-2
France · operational · classified
Tera-1000-2
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
- 11.97 PFlop/s
- Rpeak
- 23.40 PFlop/s
- Rmax ÷ Rpeak
- 51.2%
- Cores
- -
- Power
- 3.18 MW
- Per watt
- 3.8 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 | - Atos BullSequana X1000 | Eviden | - | Verified | cea.frtop500.org |
| Interconnect | - Bull BXI 1.2 | Eviden | - | Verified | cea.frtop500.org |
| Cooling | Direct liquid cooling, warm water Cooling Direct-to-chip cold plates, facility water loop · Removes 90+ percent of node heat to liquid warm water circulation as close as possible to processors | Eviden | - | Reported | cea.fr |
The read
CEA's defence-programme Atos BullSequana X1000 system of Xeon Phi 7250 nodes on the Bull BXI network, warm-water cooled, deployed in two stages at Bruyeres-le-Chatel. TOP500 lists a first stage (Tera-1000-2-Part 1) at 24th in November 2017 and the full machine at 14th in June 2018, the best rank; the full entry was still listed in June 2026. CEA and Atos say 540,000 cores where TOP500 counts 561,408, so no core count is recorded. The 25 PFlop/s CEA quotes covers the whole Tera-1000 programme including its earlier Xeon partition, so TOP500's 23.4 PFlop/s peak for this entry is used. TOP500 is the only source for Rmax, so the tier is reported.
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
Where sources disagree
We record conflicts instead of picking a winner quietly. All open questions.
- Core count: 540,000 cores (CEA) against 561,408 (TOP500). No core count is recorded.
Change history
- 2026-09-22 Gained a Green500 rank pointer (#184 on the 2025-06 list)
- 2026-09-20 Added with a rank pointer; core count conflict logged
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 |
|---|---|---|
| cea.fr | does not name this system | Direct liquid cooling, warm water |
| top500.org | 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.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.
Power and cooling
Why air ran out at 20 kW a rack, how warm-water cooling removes the chillers, and what PUE conceals.