LUMI
LUMI is the EuroHPC pre-exascale system run by the LUMI consortium in CSC's Kajaani data centre, serving European research in climate, drug discovery, AI and health, with up to a fifth of capacity open to companies.
What it runs and how to get time
From the operator- Used for What the operator says the system is used for: science domains, missions or workloads. Taken from the operator, its funder or the system vendor, not from TOP500.
- Climate and weather research, drug discovery and personalised medicine, pandemic research, AI combined with simulation, cybersecurity, and industrial and SME projects. 4
- How to get time How researchers or customers get time on the system, naming the allocation programme where the operator states one.
- Half of capacity via EuroHPC JU Access Calls; half via national calls in the LUMI consortium countries, each run under local allocation rules. 5
- Cooling Cooling design stated by the operator or supplier.
- Liquid circulation cooling, helped by Kajaani's cool climate. 6
- Power design Facility power, energy supply or heat reuse as stated by the operator. Not the benchmark power in the Power column.
- 100% hydropower supplied by Vattenfall; waste heat feeds Kajaani's district heating, covering about 20% of the city's heat demand. 6
- Facility Building, data centre or campus that houses the system, as described by the operator.
- CSC data centre in a converted paper mill hall, Renforsin Ranta business park, Kajaani, Finland. 6
- Upgrade or successor Announced upgrade, expansion, successor or retirement plan, with dates where the operator gives them.
- EuroHPC signed a contract with Bull on 31 Aug 2026 for LUMI-AI, the LUMI AI Factory system in Kajaani with ten times LUMI's AI capacity, due for users in 2027. 7
Benchmark and hardware
Source per value- Rank Position in the TOP500 edition named in the Edition column. Historic systems keep the rank of the edition where they last appeared.
- 11 1
- Rmax PFLOP/s Measured double-precision LINPACK (HPL) performance of the listed configuration. Older TFLOP/s and GFLOP/s figures are converted to PFLOP/s.
- 379.7 1
- Rpeak PFLOP/s Theoretical peak double-precision performance of the listed configuration. This is not AI or mixed-precision throughput.
- 531.51 1
- HPL efficiency % Rmax divided by Rpeak: the share of theoretical peak the system delivered on LINPACK. Computed from the two sourced figures.
- 71.4 1
- Power kW Power reported for the benchmark run. Measurement boundaries vary by site; this is not facility power, TDP or cooling capacity. Empty when the system does not report it.
- 7,107 1
- Efficiency GFLOP/s per W Rmax per watt of reported benchmark power, computed from the two sourced figures (GFLOP/s per W). Empty when power is not reported.
- 53.43 1
- Site Host or operator named by TOP500 for the installation.
- EuroHPC/CSC 1
- Country Country or region reported by TOP500 for the site.
- Finland 1
- City Site city as reported by TOP500 or the operator. It can be the operator address rather than the machine room.
- Kajaani 3
- Region World region of the installation country (grouping applied by this site).
- Europe 1
- Vendor Manufacturer or system supplier exactly as submitted to TOP500.
- HPE 1
- Vendor group Supplier grouped for filtering. Bull is the Eviden/Atos line; Other covers single-system suppliers.
- HPE 1
- System model Hardware platform in the cited TOP500 edition.
- HPE Cray EX235a 1
- Processor CPU description in the cited TOP500 edition; clock and core count refer to the processor model.
- AMD Optimized 3rd Generation EPYC 64C 2GHz 1
- Accelerator Accelerator model listed for the system. Empty when TOP500 lists none.
- AMD Instinct MI250X 1
- Accelerator vendor Maker of the accelerator. None listed means TOP500 names no accelerator for the system.
- AMD 1
- Interconnect Network fabric exactly as listed in the cited TOP500 edition.
- Slingshot-11 1
- Fabric Interconnect family derived from the listed interconnect (grouping applied by this site).
- Slingshot 1
- Cores cores Total cores submitted to TOP500, including accelerator cores where TOP500 counts them. Not a CPU-only count and not a CUDA-core count.
- 2,752,704 1
- Installed Installation year reported in the TOP500 system record. Not necessarily the year of production acceptance.
- 2023 2
- Edition TOP500 edition (YYYY-MM) that supplies the ranking and benchmark data. A historic edition does not assert current operating status.
- 2026-06 1
- OS Operating system from the TOP500 system record.
- HPE Cray OS 2
- TOP500 record Link to the TOP500 database record for this exact submission.
- https://www.top500.org/system/180048/ 2
Sources
- TOP500 list, June 2026 accessed 2026-11-11
- TOP500 system record accessed 2026-11-11
- TOP500 site record accessed 2026-11-11
- One of the world's mightiest supercomputers, LUMI, will lift European research and competitiveness to a new level and promotes green transition accessed 2026-11-11
- Get Started - LUMI accessed 2026-11-11
- Deep dive into the building of the LUMI data center accessed 2026-11-11
- EuroHPC JU Signs Contract to Deploy the LUMI-AI Supercomputer accessed 2026-11-11