HOKUSAI BigWaterfall

Also known as HOKUSAI BWMPC

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: 1.60 PFlop/s
Rpeak: 2.58 PFlop/s
Rmax ÷ Rpeak: 62.0%
Cores: 33,600
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	- Fujitsu PRIMERGY CX2550 M4, 840 nodes	Fujitsu 6702TSE	-	Verified	top500.org staff.cs.manchester.ac.uk
CPU	Intel Xeon Gold 6148 CPUs x86-64 · 20C · 2.4 GHz · 14 nm · 150 W Xeon Gold 6148 20C 2.4GHz, 1,680 CPUs (33,600 cores)	Intel INTCNASDAQ	1,680 reported	Verified	top500.org staff.cs.manchester.ac.uk
Interconnect	Mellanox InfiniBand EDR Interconnect Fat tree · 100 Gb/s per 4x port · About 0.9 microseconds InfiniBand EDR	NVIDIA NVDANASDAQ	-	Verified	top500.org staff.cs.manchester.ac.uk

The read

Second general-purpose cluster of RIKEN's HOKUSAI system: 840 Fujitsu PRIMERGY CX2550 M4 nodes with two Xeon Gold 6148 each (1,680 CPUs, 33,600 cores, 78.7 TB memory) on InfiniBand EDR, plus two large-memory PRIMERGY RX4770 servers and 5 PB online storage. Ranked 83rd on the November 2017 TOP500 and stayed listed through June 2021. Status as of is the last TOP500 list it appeared on.

Timeline

2017 First operational source
2017-11 List debut at #83 (November 2017) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#83: TOP500, November 2017 →

Site & facility

RIKEN Wako Campus

Location: Wako, Saitama, Japan

riken.jp top500.org

Change history

2026-10-02 Added HOKUSAI BigWaterfall, RIKEN's Xeon Gold 6148 cluster, 83rd on the November 2017 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
staff.cs.manchester.ac.uk	names system only	-
top500.org	names system and part	Intel Xeon Gold 6148, Mellanox InfiniBand EDR

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.