Supercomputers/Systems/MCR
USA · decommissioned · hpc
MCR
Also known as MCR Linux Cluster; Multiprogrammatic Capability Resource
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
- 7.63 TFlop/s
- Rpeak
- 11.06 TFlop/s
- Rmax ÷ Rpeak
- 69.0%
- Cores
- 2,304
- 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 |
|---|---|---|---|---|---|
| CPU | - Pentium 4 Xeon 2.4 GHz, two per node, 1,152 nodes | Intel | 2,304 reported | Reported | top500.orghpc.llnl.gov |
| Interconnect | Quadrics QsNet Interconnect Fat tree · 340 MB/s per direction · About 2 microseconds Quadrics QsNet Elan3 federated switch, 12 node switches and 4 trunk switches | Quadrics | - | Reported | top500.orghpc.llnl.gov |
The read
Livermore's 1,152-node Linux cluster of dual 2.4 GHz Pentium 4 Xeon nodes with a Quadrics QsNet Elan3 federated switch, built by Linux Networx. LLNL's Linux Project report describes the 1,152-node production system and its first-of-kind 12 node switch plus 4 trunk switch fabric, scheduled for deployment before the end of 2002. TOP500 ranks it third on the June 2003 list at 7.634 TFLOPS Rmax and seventh in November 2003, and keeps it listed into 2004. No retirement date was found. TOP500 is the only source for Rmax, 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 MCR, Livermore's 2002 Linux 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.
Every source cited on this page was readable, and none of them mentions this system. They are cited at page granularity, normally because no stable deep link could be found. That is a real weakness in this row and it is why the system carries a confidence tier below verified. See how this check works.
| Cited source | Result | Found on the page |
|---|---|---|
| hpc.llnl.gov | does not name this system | Quadrics QsNet |
| top500.org | does not name this system | Quadrics QsNet |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.