USA · operational · hpc

Grizzly

Also known as LANL CTS-1 Grizzly

Operated by Los Alamos National Laboratory at Los Alamos Strategic Computing Complex .

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: 1.52 PFlop/s
Rpeak: 1.79 PFlop/s
Rmax ÷ Rpeak: 84.9%
Cores: 53,352
Power: 603.4 kW
Per watt: 2.5 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	- Penguin Computing Tundra Extreme Scale (CTS-1)	Penguin Computing	-	Reported	top500.org
CPU	Intel Xeon E5-2695 v4 CPUs x86-64 · 18C · 2.1 GHz · 14 nm · 120 W Xeon E5-2695v4 18C 2.1GHz (Broadwell)	Intel INTCNASDAQ	-	Reported	top500.org
Interconnect	Omni-Path Architecture Interconnect Fat tree · 100 Gb/s per port · About 1 microsecond Intel Omni-Path	Intel INTCNASDAQ	-	Reported	top500.org

The read

Los Alamos' institutional-computing Penguin Tundra Extreme Scale cluster from the CTS-1 commodity procurement: Xeon E5-2695v4 18-core Broadwell processors on Intel Omni-Path running TOSS. TOP500 lists 53,352 cores, 1.52 PFlop/s Rmax, 1.79 PFlop/s peak and 603.4 kW, ranking it 67th in November 2016 and 497th in June 2021. LANL's public job-data repository calls it a 1,498-node cluster and holds accounting records to November 2022, which sets the status date. TOP500 is the only source for the core count and Rmax.

Timeline

2016 First operational source
2016-11 List debut at #67 (November 2016) source

Public list appearances

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

#67: TOP500, November 2016 →

Site & facility

Los Alamos Strategic Computing Complex

Location: Los Alamos, NM, USA
Cooling: Chilled water
Commissioned: 1993

lanl.gov

Change history

2026-10-02 Added Grizzly, LANL

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
github.com	names system only	-
top500.org	names system and part	Intel Xeon E5-2695 v4, Omni-Path Architecture

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