Supercomputers/Systems/Shoubu
Japan · operational · hpc
Shoubu
Also known as Shoubu ExaScaler-1.4
Operated by RIKEN at RIKEN Wako Campus .
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
- 610.00 TFlop/s
- Rpeak
- 1.54 PFlop/s
- Rmax ÷ Rpeak
- 39.6%
- Cores
- 1,181,952
- Power
- -
- Per watt
- - 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 | - ExaScaler-1.4 80Brick | ExaScaler | - | Reported | top500.orgriken.jp |
| Accelerator | - PEZY-SC many-core accelerators | PEZY Computing | - | Reported | top500.orgriken.jp |
| CPU | - Xeon E5-2618Lv3 8C 2.3GHz | Intel | - | Reported | top500.org |
| Interconnect | Mellanox InfiniBand FDR Interconnect Fat tree · 56 Gb/s per 4x port · About 1 microsecond Infiniband FDR | NVIDIA | - | Reported | top500.org |
| Cooling | Single-phase immersion Cooling Full submersion in a dielectric bath · 100 kW per tank and above Liquid immersion cooling | ExaScaler | - | Reported | riken.jp |
The read
PEZY-SC based ExaScaler-1.4 80Brick system at RIKEN's Advanced Center for Computing and Communication in Wako, built by ExaScaler and PEZY Computing with Xeon E5-2618L v3 hosts on InfiniBand FDR and liquid immersion cooling. Became the first petaflop-class machine to top the Green500 and held first place for three consecutive lists. Ranked 136th on the November 2015 TOP500 (160th in June 2015 at a smaller configuration). Status as of is the last list used here.
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
- 2026-10-02 Added Shoubu, RIKEN's PEZY-SC immersion-cooled system, 136th on the November 2015 TOP500
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 |
|---|---|---|
| riken.jp | blocked our fetch | - |
| top500.org | names system and part | Mellanox InfiniBand FDR |
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
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.