Supercomputers/Systems/Atlas (LLNL)
USA · decommissioned · hpc
Atlas (LLNL)
Also known as LLNL Atlas; Peloton Atlas
Operated by Lawrence Livermore National Laboratory at Livermore Computing Center .
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
- 36.62 TFlop/s
- Rpeak
- 44.24 TFlop/s
- Rmax ÷ Rpeak
- 82.8%
- Cores
- 9,216
- 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 | - Appro Xtreme Server nodes, 1,152 nodes | Appro HPENYSE
rolls up to Hewlett Packard Enterprise | 1,152 reported | Reported | hpc.llnl.govtop500.org |
| CPU | - Four dual-core AMD Opteron 2.4 GHz Socket F processors per node | AMD | 9,216 reported | Reported | hpc.llnl.govtop500.org |
The read
One of six Peloton clusters Livermore bought after awarding Appro the contract in June 2006: 1,152 nodes of four dual-core 2.4 GHz Opterons each (9,216 cores, 44.2 TFLOPS peak) on 4x DDR InfiniBand. LLNL's cluster tutorial says the last Peloton clusters were retired in June 2012 but gives no date for Atlas alone. TOP500 ranks it 19th on the June 2007 list at 36.62 TFLOPS Rmax and 44.24 peak and credits Cray/HPE as manufacturer, reflecting Appro's later acquisition. The Rmax is from TOP500 alone, so the tier is reported.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Livermore Computing Center
- Location
- Livermore, CA, USA
- Cooling
- Direct liquid cooling (warm water)
- Commissioned
- 1996
Change history
- 2026-10-02 Added Atlas, a Livermore Peloton Opteron 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.llnl.gov | names system only | - |
| top500.org | names system only | - |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.