Germany · decommissioned · hpc

CoolMUC-2

Also known as LRZ CoolMUC-2; CooLMUC-2

Operated by LRZ at Leibniz Supercomputing Centre, Garching .

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: 1263 of 1345 systems have a readable citation that names them, and 56 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: 366.36 TFlop/s
Rpeak: 465.92 TFlop/s
Rmax ÷ Rpeak: 78.6%
Cores: 11,200
Power: 192.81 kW
Per watt: 1.9 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	- Lenovo/IBM NeXtScale nx360M5 system (TOP500 listing)	Lenovo 992HKEX	-	Reported	top500.org
CPU	Intel Xeon E5-2697 v3 CPUs x86-64 · 14C · 2.6 GHz · 22 nm · 145 W Intel Xeon E5-2697v3 14-core 2.6 GHz (28-way Haswell-EP nodes), 812 nodes at full size	Intel INTCNASDAQ	-	Reported	doku.lrz.de top500.org
Interconnect	Mellanox InfiniBand FDR Interconnect Fat tree · 56 Gb/s per 4x port · About 1 microsecond InfiniBand FDR14 interconnect	NVIDIA NVDANASDAQ	-	Verified	doku.lrz.de top500.org
Operating system	SUSE Linux Enterprise Server Operating systems Linux distribution · Open source, commercial support subscription SUSE Linux Enterprise Server 15 SP1	SUSE	-	Reported	doku.lrz.de

The read

LRZ's hot-water-cooled Linux cluster segment with the same processor and cooling technology as SuperMUC Phase 2. LRZ's documentation says installation of the first subsystem began in December 2014, user operation started in May 2015, the final expansion ranked 261st on the November 2015 TOP500, adsorption chillers from Sortech turned waste heat into cooling for storage, and the system was shut off on Friday 13 December 2024. At the end it had 812 nodes of 28 cores each (28-way Haswell-EP, 2.6 GHz, 64 GB, InfiniBand FDR14), 1,400 TFlop/s peak and 290 kVA electric power fully loaded, under SLES15 SP1. TOP500 lists the 11,200-core Lenovo/IBM NeXtScale nx360M5 part (Xeon E5-2697v3 14C 2.6 GHz) at 366.36 TFlop/s Rmax, 465.92 TFlop/s Rpeak and 192.81 kW, 316th in June 2015 at 7,056 cores and 262nd in November 2015 (LRZ says 261st), and 469th in November 2016, its last list. TOP500's figures describe a subset of the final 812-node machine and are used as listed, so the tier is reported.

Timeline

2015-05 First operational source
2015-11 List debut at #262 (November 2015) source
2024-12-13 Decommissioned source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#262: TOP500, November 2015 →

Site & facility

Leibniz Supercomputing Centre, Garching

Location: Garching, Germany
Cooling: Direct warm-water cooling
Commissioned: 2006

doku.lrz.de

Change history

2026-10-09 CoolMUC-2 added from its source pages

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
doku.lrz.de	blocked our fetch	-
top500.org	names system and part	Intel Xeon E5-2697 v3, Mellanox InfiniBand FDR

Checked 2026-10-13 by pnpm verify. Re-run it and the table changes with the web.