Bulgaria · operational · mixed

HEMUS

Also known as HEMUS petascale supercomputer; IICT-BAS HEMUS

Operated by IICT-BAS at IICT-BAS Data Centre (Sofia) .

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: 2.53 PFlop/s
Rpeak: 3.21 PFlop/s
Rmax ÷ Rpeak: 78.8%
Cores: 19,840
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
Integrator	- HPE (TOP500 manufacturer)	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org
Accelerator	NVIDIA A100 SXM4 40GB Accelerators CUDA (Ampere GA100) · 6,912C · 1.41 GHz · 7 nm · 400 W NVIDIA A100 SXM4 40 GB	NVIDIA NVDANASDAQ	-	Reported	top500.org
CPU	AMD EPYC 7742 (Rome) CPUs x86-64 · 64C · 2.25 GHz · 7 nm · 225 W AMD EPYC 7742 64C 2.25GHz	AMD AMDNASDAQ	-	Reported	top500.org
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds Infiniband HDR	NVIDIA NVDANASDAQ	-	Reported	top500.org
Operating system	SUSE Linux Enterprise Server Operating systems Linux distribution · Open source, commercial support subscription SUSE Linux	SUSE	-	Reported	top500.org

The read

Petascale CPU and GPU supercomputer of the Institute of Information and Communication Technologies at the Bulgarian Academy of Sciences (IICT-BAS), inaugurated on 19 October 2023 as part of the Centre of Excellence in Informatics and ICT. TOP500 lists an HPE system with AMD EPYC 7742 64-core 2.25 GHz processors, NVIDIA A100 SXM4 40 GB accelerators and InfiniBand HDR under SUSE Linux, 19,840 cores, Rmax 2.53 PFlop/s and Rpeak 3.21 PFlop/s, first ranked in November 2023 (359th on the TOP500 system page; the centre's own news item says 360th). The Bulgarian Academy of Sciences announcement describes a supercomputer with peak performance above 3 PFlop/s and a 6.72 PB data store, but gives a core figure of nearly 100,000 that does not match the TOP500 HPL core count; the TOP500 figure is recorded. TOP500 shows later rankings of 395th (June 2024), 441st (November 2024) and 485th (June 2025).

Timeline

2023-10 First operational source
2023-11 List debut at #359 (November 2023) source

Public list appearances

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

#359: TOP500, November 2023 →

Site & facility

IICT-BAS Data Centre (Sofia)

Location: Sofia, Bulgaria

hpc.acad.bg

Change history

2026-10-02 Added HEMUS, the IICT-BAS petascale supercomputer in Sofia

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
top500.org	names system and part	AMD EPYC 7742 (Rome), NVIDIA A100 SXM4 40GB, NVIDIA InfiniBand HDR, SUSE Linux Enterprise Server
bas.bg	names system only	-

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