Supercomputers/Systems/Lonestar 5
USA · decommissioned · hpc
Lonestar 5
Also known as TACC Lonestar 5 Cray XC40
Operated by Texas Advanced Computing Center at Texas Advanced 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
- 1.02 PFlop/s
- Rpeak
- 1.25 PFlop/s
- Rmax ÷ Rpeak
- 81.6%
- Cores
- 30,048
- Power
- 586.88 kW
- Per watt
- 1.7 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 | - Cray XC40 | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.orgrdworldonline.com |
| CPU | Intel Xeon E5-2690 v3 CPUs x86-64 · 12C · 2.6 GHz · 22 nm · 135 W Xeon E5-2690v3 12C 2.6GHz | Intel | - | Reported | top500.org |
| Interconnect | Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Aries interconnect | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.orgrdworldonline.com |
| Storage | - DDN 5 PB storage system | DDN | - | Reported | rdworldonline.com |
The read
TACC's Cray XC40 for the University of Texas System and partners: 1,252 compute nodes of two Haswell Xeon E5-2690 v3 12-core CPUs (30,048 cores), 16 K40 GPU nodes and large-memory nodes on Cray Aries, with 5 PB of DDN storage and a 1.25 petaflop peak, announced as entering full production in January 2016. TOP500 first lists it 79th in November 2015 and last in November 2018. Decommissioned reflects its disappearance from TOP500 after that list and the arrival of Lonestar6; no retirement date is recorded. TOP500 is the only source for Rmax and power, 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
Texas Advanced Computing Center
- Location
- Austin, TX, USA
- Cooling
- Direct liquid cooling
- Commissioned
- 2007
Change history
- 2026-10-02 Added Lonestar 5, TACC's 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 |
|---|---|---|
| rdworldonline.com | names system and part | Intel Xeon E5-2690 v3, Cray Aries |
| top500.org | names system and part | Intel Xeon E5-2690 v3, Cray Aries |
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.