LUMI (Large Unified Modern Infrastructure) is a petascale supercomputer located at the CSC data center[3] in Kajaani, Finland. As of January 2023, the computer is the fastest supercomputer in Europe.[4]

ActiveJune 13, 2022
SponsorsEuropean High-Performance Computing Joint Undertaking, LUMI Consortium
LocationKajaani, Finland
Architecture362,496 cores, AMD EPYC CPUs, 10,240 AMD Radeon Instinct MI250X GPUs (144,179,200 cores)[1][2]
Power8.5 MW
Space150 m2
Memory1.75 petabytes
Storage117 petabytes
Speed550 petaFLOPS (peak)
Cost€144.5 million

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 top five 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]



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]



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, Poland, Sweden, and Switzerland. The total budget is €144.5 million.[13]



The computer uses 100% hydroelectric energy, and the heat it generates will be captured and used to heat buildings in the area,[14][15] making LUMI one of the most environmentally efficient supercomputers in the world.[16] 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.[17]



Half of LUMI's capacity belongs to the EuroHPC Joint Undertaking, 20% of which is reserved for industry and SME use.[18] The other half is shared among the LUMI Consortium countries, according to each country’s financial contribution.[19]

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.[20]



The word "lumi" means "snow" in Finnish.[21]

See also

  • Leonardo, another EuroHPC supercomputer under construction in Bologna, Italy
  • EuroHPC (European High-Performance Computing Joint Undertaking).


  1. ^ a b
  2. ^
  3. ^ "CSC: One of the world's mightiest supercomputers LUMI will lift European research and competitiveness to a new level". ScienceBusiness. Science Business Publishing International SRL. October 21, 2020. Retrieved February 14, 2021.
  4. ^ Larabel, Michael (13 June 2022). "LUMI Inaugurated As Europe's Most Powerful Supercomputer - Powered By AMD CPUs/GPUs". Retrieved 14 June 2022.
  5. ^ Black, Doug (2020-05-01). "LUMI: the EuroHPC pre-exascale system of the North". insideHPC. Retrieved 2021-02-15.
  6. ^ "November 2022 | TOP500". Retrieved 2022-11-19.
  7. ^ "Hewlett Packard Enterprise wins $160M+ contract to power one of the world's fastest supercomputers based in Finland to bolster Europe's research in science and unlock economic growth". Hewlett Packard Enterprise. Hewlett Packard Enterprise Development LP. October 21, 2020. Retrieved February 13, 2021.
  8. ^ Elster, Anne C. (February 26, 2021). "The European Factor: From ARM to Atos". Computing in Science & Engineering. 23 (1). IEEE: 102–105. Bibcode:2021CSE....23a.102E. doi:10.1109/MCSE.2020.3044070. S2CID 230608538. Retrieved 2021-07-09.
  9. ^ Maagaard Winther, Cecilie (December 6, 2019). "Huge HPC project offers great opportunities but is not without challenges". Danish e-infrastructure Cooperation. Retrieved February 15, 2021.
  10. ^
  11. ^
  12. ^ "AMD's Next Gen EPYC & Radeon Instinct Powered LUMI Supercomputer Announced For 2021, 550 Petaflops Peak Horsepower". NewAge ADS, LLC. October 22, 2020. Retrieved February 14, 2021.
  13. ^ "LUMI: a new EuroHPC world-class supercomputer in Finland". EuroHPC. European Commission. October 21, 2020. Retrieved February 14, 2021.
  14. ^ "LUMI Supercomputer Will Start Operations Next Year, Promotes Green Transition". HPCwire. Tabor Communications. November 17, 2020. Retrieved February 13, 2021.
  15. ^ "Be prepared for Euro-HPC resource LUMI | Karolinska Institutet". Retrieved 2021-07-09.
  16. ^ "LUMI supercomputer will now be built". Swedish Research Council. 27 October 2020.
  17. ^ Manninen, Pekka (January 22, 2021). The pan-European supercomputer of the North (PDF) (Speech). 1st LUMI Roadshow. EuroCC National EuroHPC Competence Center Sweden.
  18. ^ Nordgren, Kaj (June 22, 2021). "Finland grants access to startups to supercomputer resources". Business Finland. Retrieved 2021-07-13.
  19. ^ "FAQ". LUMI. Retrieved 2021-07-13.
  20. ^ "LUMI pilot projects selected". LUMI. 2021-06-01. Retrieved 2021-07-09.
  21. ^ Alanne, Severi (1919). Suomalais-Englantilainen Sanakirja - Finnish-English Dictionary. Superior, Wisconsin: Tyomies Publishing Company. p. 343.