Supercomputers/Systems/Belenos
France · operational · hpc
Belenos
Operated by Meteo-France at Meteo-France Computing Centre (Toulouse) .
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
- 7.68 PFlop/s
- Rpeak
- 10.47 PFlop/s
- Rmax ÷ Rpeak
- 73.4%
- Cores
- 294,912
- Power
- 1.66 MW
- Per watt
- 4.6 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 | - Eviden (Atos) BullSequana XH2000 | Eviden | - | Reported | top500.orgmeteofrance.com |
| CPU | AMD EPYC 7742 (Rome) CPUs x86-64 · 64C · 2.25 GHz · 7 nm · 225 W AMD EPYC 7742 64C 2.25GHz | AMD | - | Reported | top500.org |
| Interconnect | - Mellanox InfiniBand HDR100 | Mellanox NVDANASDAQ
rolls up to NVIDIA | - | Reported | top500.org |
The read
Taranis's twin at Meteo-France's Toulouse computing centre, identical in architecture (Eviden BullSequana XH2000, AMD EPYC 7742, Mellanox InfiniBand HDR100) but a slightly different Rmax, 7.68 PFlop/s against Taranis's 8.19, an asymmetry TOP500 records without explanation. First listed on the June 2020 TOP500 at rank 29, five months ahead of Taranis's own debut, though Meteo-France's press material describes both as deployed and inaugurated together across 2020 and 2021. Meteo-France's own account and TOP500 agree on the site and the twin relationship; TOP500 alone gives the exact Rmax, Rpeak, cores and power draw, 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
Meteo-France Computing Centre (Toulouse)
- Location
- Toulouse, France
- Commissioned
- 2020
Change history
- 2026-09-24 Belenos added, Taranis's twin at Meteo-France Toulouse
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 |
|---|---|---|
| meteofrance.com | names system only | - |
| top500.org | names system and part | AMD EPYC 7742 (Rome) |
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.