Supercomputers/Systems/Sierra
USA · operational · classified
Sierra
Also known as ATS-2
Operated by Lawrence Livermore National Laboratory at Livermore Computing Center.
Phase 1 seed dataset — under review. These rows were compiled by hand from public operator, laboratory and vendor sources, and have not yet been through a second-reader verification pass. Every claim carries its source and a confidence tier; treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
- 94.64 PFlop/s
- Rpeak
- 125.7 PFlop/s
- Rmax ÷ Rpeak
- 75.3%
- Cores
- 1,572,480
- Power
- 7.44 MW
- Per watt
- 12.7 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 | — IBM Power System AC922 | IBM | — | Reported | hpc.llnl.govolcf.ornl.gov |
| Accelerator | NVIDIA Tesla V100 Accelerators NVIDIA Volta GV100, 4 per node | NVIDIA | 17,280 reported | Reported | hpc.llnl.govolcf.ornl.gov |
| CPU | IBM POWER9 22C CPUs IBM POWER9 22C 3.1GHz | IBM | 8,640 reported | Reported | hpc.llnl.govolcf.ornl.gov |
| Interconnect | Mellanox InfiniBand EDR Interconnect Dual-rail Mellanox EDR InfiniBand | Mellanox NVDANASDAQ rolls up to NVIDIA | — | Reported | hpc.llnl.govolcf.ornl.gov |
| Operating system | Red Hat Enterprise Linux Operating systems Red Hat Enterprise Linux for POWER | Red Hat | — | Reported | hpc.llnl.govolcf.ornl.gov |
The read
Summit's sibling under the same CORAL procurement, with four V100s per node instead of six. The pairing is useful analytically: two systems, same vendors, same year, same fabric, different node ratios — a rare controlled comparison for anyone modelling accelerator-per-node trends. Stockpile stewardship workload.
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