Germany · operational · hpc

JUSTUS 2

Also known as bwForCluster JUSTUS 2

Operated by Ulm University at Ulm University Computing Centre (kiz) .

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: -
Rpeak: 2.20 PFlop/s
Rmax ÷ Rpeak: -
Cores: 33,696
Power: 400 kW
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	- NEC Deutschland GmbH (cooperation partner and vendor)	NEC 6701TSE	-	Reported	uni-ulm.de
Accelerator	- 14 GPU nodes x 2 NVIDIA V100S (quantity derived as 14 x 2)	NVIDIA NVDANASDAQ	28 reported	Reported	wiki.bwhpc.de uni-ulm.de
CPU	- Two Intel Xeon Gold 6252 (Cascade Lake, 24 cores, 2.1 GHz) per node, 33,696 cores in total	Intel INTCNASDAQ	-	Reported	uni-ulm.de wiki.bwhpc.de
Interconnect	Omni-Path Architecture Interconnect Fat tree · 100 Gb/s per port · About 1 microsecond Omni-Path 100 Gbit/s fat tree with a 40:8 blocking ratio	Cornelis Networks	-	Reported	uni-ulm.de wiki.bwhpc.de
Storage	- Two Lustre file systems on NEC LxFS-Z: 250 TB home and 1.2 PB global workspace	NEC 6701TSE	-	Reported	uni-ulm.de

The read

A NEC cluster at Ulm University for theoretical chemistry, quantum physics and solid-state physics within the Baden-Wuerttemberg bwHPC concept, inaugurated on 6 March 2020 at a cost of 4.4 million euros. Ulm's system description gives 692 compute nodes (702 including login, service and visualisation nodes) with two Xeon Gold 6252 (24 cores, 2.1 GHz) each and 33,696 cores in total, about 2.2 PFlop/s theoretical peak, 100 Gbit/s Omni-Path in a fat tree, 14 GPU nodes with two NVIDIA V100S each, 13 cabinets (12 water cooled), about 400 kW at full load and two Lustre file systems built on NEC LxFS-Z (250 TB home and 1.2 PB workspace). Ulm announced it as among the 400 most powerful supercomputers in March 2020, but no TOP500 page was located, so ranked is 0. The two sources are Ulm University and the bwHPC wiki, both part of the same project, so the tier is reported.

Timeline

2020-03-06 First operational source

Site & facility

Ulm University Computing Centre (kiz)

Location: Ulm, Germany
Commissioned: 2020

uni-ulm.de

Change history

2026-10-04 Added JUSTUS 2, Ulm University

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
wiki.bwhpc.de	names system and part	Omni-Path Architecture
uni-ulm.de	names system only	-

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.