Supercomputers/Systems/HOKUSAI GreatWave
Japan · decommissioned · hpc
HOKUSAI GreatWave
Also known as HOKUSAI Phase 1
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
- 990.00 TFlop/s
- Rpeak
- 1.09 PFlop/s
- Rmax ÷ Rpeak
- 90.8%
- Cores
- 34,560
- Power
- 518.4 kW
- 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 | Fujitsu | - | Verified | top500.orgriken.jp |
| Accelerator | - 30 application servers with four Tesla K20X each | NVIDIA | 120 estimated | Reported | riken.jp |
| CPU | - SPARC64 XIfx 32C 1.98GHz, 1,080 nodes (34,560 cores) | Fujitsu | 1,080 reported | Verified | top500.orgriken.jp |
| Interconnect | - Tofu interconnect 2 | Fujitsu | - | Reported | top500.org |
| Storage | Fujitsu FEFS Storage Lustre-based parallel filesystem · Roughly 150 PB across multiple volumes on Fugaku FEFS file system, 2.1 PB online and 7.9 PB hierarchical storage | Fujitsu | - | Reported | riken.jp |
The read
First stage of RIKEN's HOKUSAI shared research system at Wako: 1,080 Fujitsu PRIMEHPC FX100 nodes (34,560 SPARC64 XIfx cores, about 1 PFLOPS peak) on Tofu 2, plus an application server group of 30 GPU nodes with four Tesla K20X each and two 1 TB large-memory servers, linked by InfiniBand FDR and a 2.1 PB FEFS online store. Replaced the RICC cluster. Status as of is the last TOP500 list it appeared on (November 2018).
Timeline
- 2015-04 First operational source
- 2015-06 List debut at #70 (June 2015) source
- 2020-03 Decommissioned source
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 HOKUSAI GreatWave, RIKEN's Fujitsu PRIMEHPC FX100 system, 70th on the June 2015 TOP500
- 2026-10-02 Marked HOKUSAI GreatWave decommissioned
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 | names system and part | Fujitsu FEFS |
| 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.
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.