JAIST Cray XC40

Also known as JAIST XC40 (2017)

Operated by JAIST at JAIST Nomi 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: 584.77 TFlop/s
Rpeak: 662.86 TFlop/s
Rmax ÷ Rpeak: 88.2%
Cores: 19,728
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	- Cray XC40, 548 nodes	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Verified	top500.org jaist.ac.jp
CPU	Intel Xeon E5-2695 v4 CPUs x86-64 · 18C · 2.1 GHz · 14 nm · 120 W Intel Xeon E5-2695 v4 18C 2.1GHz, two per node	Intel INTCNASDAQ	1,096 estimated	Verified	top500.org jaist.ac.jp
Interconnect	Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Cray Aries interconnect, Dragonfly topology	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Verified	top500.org jaist.ac.jp
Storage	Lustre Storage Parallel filesystem, separate metadata and object servers 200TB Lustre parallel file system	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	jaist.ac.jp
Operating system	Cray Linux Environment Operating systems Linux, Cray-customised · Proprietary layer over open-source Linux Cray Linux Environment	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	top500.org

The read

Cray XC40 that served as the primary supercomputer of the Japan Advanced Institute of Science and Technology. JAIST's information science center page lists 548 nodes and 19,728 cores of dual 18-core Xeon E5-2695v4 2.1GHz with 128GB of DDR4 per node, a Dragonfly topology, 662.8 TFlop/s peak and a 200TB Lustre file system, and files the machine under previous supercomputers; the current JAIST system is HAKUSAN. TOP500 lists the same 19,728 cores on Aries, Rmax 584.77 and Rpeak 662.86 TFlop/s, ranked 339th in June 2017 and 470th in November 2017. It replaced an earlier 8,640-core Xeon E5-2690v3 XC40 that ranked 252nd in June 2015 and 366th in November 2015 on the TOP500, which is not recorded separately.

Timeline

2017 First operational source
2017-06 List debut at #339 (June 2017) source

Public list appearances

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

#339: TOP500, June 2017 →

Site & facility

JAIST Nomi Campus

Location: Nomi, Ishikawa, Japan

scientific-computing.com

Change history

2026-10-09 Added JAIST Cray XC40

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
top500.org	names system and part	Intel Xeon E5-2695 v4, Cray Aries, Cray Linux Environment
jaist.ac.jp	names system and part	Intel Xeon E5-2695 v4, Cray Aries, Lustre, Cray Linux Environment

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