Supercomputers/Systems/Attaway
USA · operational · hpc
Attaway
Also known as SNL/NNSA CTS-1 Attaway
Operated by Sandia National Laboratories .
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
- 2.72 PFlop/s
- Rpeak
- 3.89 PFlop/s
- Rmax ÷ Rpeak
- 69.9%
- Cores
- 52,920
- Power
- 750 kW
- Per watt
- 3.6 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 | Penguin Computing | - | Reported | top500.orghpc.sandia.gov |
| CPU | - Intel Xeon Gold 6140 18C 2.3GHz, 1,488 dual-socket nodes | Intel | - | Reported | hpc.sandia.govtop500.org |
| Interconnect | Omni-Path Architecture Interconnect Fat tree · 100 Gb/s per port · About 1 microsecond Intel Omni-Path | Cornelis Networks | - | Reported | top500.orghpc.sandia.gov |
| Operating system | Red Hat Enterprise Linux Operating systems Linux distribution · Open source, commercial support subscription Red Hat Enterprise Linux 7 | Red Hat | - | Reported | hpc.sandia.gov |
The read
Penguin Computing Tundra Extreme Scale cluster bought under NNSA's Commodity Technology Systems 1 (CTS-1) programme for Sandia's institutional computing. Sandia's HPC page lists 1,488 nodes and 53,568 cores of 2.3 GHz Intel Xeon Gold 6140 (two 18-core sockets per node), 192 GB per node, Omni-Path, RHEL 7, 3.943 PFlop/s peak and a December 2019 general-availability date. TOP500 lists 52,920 cores, Rmax 2.72 PFlop/s, Rpeak 3.89 PFlop/s and 750 kW, first at rank 94 on the November 2019 list and still listed in June 2026. The two sources differ slightly on cores and peak; the TOP500 figures are recorded. Sandia's page requires authentication for its links but the table itself is public.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-07 Added Attaway, Sandia's CTS-1 Tundra cluster
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 |
|---|---|---|
| hpc.sandia.gov | names system and part | Omni-Path Architecture |
| top500.org | names system and part | Omni-Path Architecture |
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.