Supercomputers/Systems/Suiren2
Japan · operational · hpc
Suiren2
Also known as KEK Suiren2
Operated by KEK .
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
- 798.00 TFlop/s
- Rpeak
- 1.08 PFlop/s
- Rmax ÷ Rpeak
- 73.9%
- Cores
- 762,624
- Power
- 47.4 kW
- Per watt
- 16.8 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 | - PEZY Computing / ExaScaler ZettaScaler-2.2 | ExaScaler | - | Reported | top500.orgnews.mynavi.jp |
| Accelerator | PEZY-SC2 Accelerators MIPS64 (PE array) · 2,048C · 0.7 GHz PEZY-SC2 accelerators | PEZY Computing | - | Reported | top500.orgdigitalengineering247.com |
| CPU | Intel Xeon D-1571 CPUs x86-64 · 16C · 1.3 GHz · 14 nm Intel Xeon D-1571 16C 1.3GHz | Intel | - | Reported | top500.org |
| Interconnect | Mellanox InfiniBand EDR Interconnect Fat tree · 100 Gb/s per 4x port · About 0.9 microseconds Infiniband EDR | Mellanox NVDANASDAQ
rolls up to NVIDIA | - | Reported | top500.org |
The read
PEZY Computing / ExaScaler ZettaScaler-2.2 immersion-cooled cluster at KEK (Xeon D-1571 16C 1.3GHz hosts, PEZY-SC2 accelerators, Infiniband EDR). It took second place on the November 2017 Green500 at 16.759 GFlops/Watt and again on the June 2018 list at 16.835 GFlops/Watt (797.99 TFlop/s Rmax on 47.4 kW; TOP500 rank 419), behind RIKEN's Shoubu system B each time. The June 2018 edition is used for the list pointer because Japanese trade press (Mynavi) reports it. Last TOP500 appearance was June 2018.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-07 Added Suiren2
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 |
|---|---|---|
| news.mynavi.jp | names system and part | Intel Xeon D-1571, PEZY-SC2, Mellanox InfiniBand EDR |
| top500.org | names system and part | Intel Xeon D-1571, PEZY-SC2, Mellanox InfiniBand EDR |
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.