LUMI
Supercomputer in Finland
From Wikipedia, the free encyclopedia
LUMI (Large Unified Modern Infrastructure) is a petascale supercomputer located at the CSC data center[3] in Kajaani, Finland. In January 2023, the computer became the fastest supercomputer in Europe.[4]
| |
| Active | June 13, 2022 |
|---|---|
| Sponsors | European High-Performance Computing Joint Undertaking, LUMI Consortium |
| Location | Kajaani, Finland |
| Architecture | 362,496 cores, AMD EPYC CPUs, 10,240 AMD Radeon Instinct MI250X GPUs (144,179,200 cores)[1][2] |
| Power | 7.1 MW |
| Space | 150 m2 |
| Memory | 1.75 petabytes |
| Storage | 117 petabytes |
| Speed | 379 petaFLOPS (Rmax) / 531 petaFLOPS (Rpeak) |
| Cost | €144.5 million |
| Ranking | TOP500: 9, June 2025 |
| Website | www.lumi-supercomputer.eu |
The completed system consists of 362,496 cores, capable of executing more than 375 petaflops, with a theoretical peak performance of more than 550 petaflops, which places it among the most powerful computers in the world.[5] The November 2022 TOP500 ranks LUMI at number five, with a measured performance of 309.1 PFLOPS.[6]
Architecture
The system is being supplied by Hewlett Packard Enterprise (HPE), providing an HPE Cray EX supercomputer with next generation 64-core AMD EPYC CPUs and AMD Radeon Instinct GPUs.[7][8] LUMI is a GPU based system, and the majority of its computing power comes from its GPU cores, an architecture which was chosen primarily for its cost/performance advantage.[9] The system is equipped with 1.75 petabytes of RAM,[1][10][11] and storage includes a 7-petabyte partition of flash storage, combined with 80-petabytes of traditional storage, both based on the Lustre parallel file system, as well as a 30-petabyte data management service based on Ceph. This gives the system a total of 117 petabytes of storage with an aggregated I/O bandwidth of 2 terabytes per second.[12]
Funding
LUMI is co-funded by the EuroHPC Joint Undertaking and the LUMI Consortium, which is composed of the following countries: Finland, Belgium, Czech Republic, Denmark, Estonia, Iceland, Norway, the Netherlands, Poland, Sweden, and Switzerland. The total budget is €144.5 million.[13][14]
Energy
The computer uses 100% hydroelectric energy, and the heat it generates will be captured and used to heat buildings in the area,[15][16] making LUMI one of the most environmentally efficient supercomputers in the world.[17] The former UPM paper mill where LUMI is located had only a single 2 minute power outage during its 38 years of operations thanks to the site's reliable connection to the national grid.[18]
Operation
Half of LUMI's capacity belongs to the EuroHPC Joint Undertaking, 20% of which is reserved for industry and SME use.[19] The other half is shared among the LUMI Consortium countries, according to each country’s financial contribution.[20]
By June 2021 pilot projects had been selected for the first run of the CPU partition, scheduled for September 2021, with full operations including the GPU partition planned for 2022.[21]