LUMI
| Company type | Consortium |
|---|---|
| Industry | Supercomputing |
| Founded | 2021 |
| Headquarters | Kajaani , Finland |
Area served | Europe |
| Products | Petascale supercomputer services |
| Owner | EuroHPC Joint Undertaking and LUMI Consortium (Finland, Belgium, Czech Republic, Denmark, Estonia, Iceland, Norway, the Netherlands, Poland, Sweden, Switzerland) |
LUMI (an acronym for Large Unified Modern Infrastructure) is a petascale supercomputer housed within the CSC facility in Kajaani, Finland. As of January 2023, it holds the distinction of being Europe's fastest supercomputer.
Equipped with 362,496 processing cores, LUMI delivers performance exceeding 375 petaflops, with a theoretical maximum surpassing 550 petaflops, placing it among the elite in global computational power. According to the November 2022 TOP500 ranking, it secured fifth place worldwide, achieving a measured throughput of 309.1 PFLOPS.
Architecture
Provided by Hewlett Packard Enterprise (HPE), LUMI incorporates an HPE Cray EX supercomputing platform that utilizes cutting-edge 64-core AMD EPYC processors alongside AMD Radeon Instinct GPUs. The choice of a GPU-centric design was driven largely by its superior cost-to-performance ratio. The system boasts 1.75 petabytes of RAM, while storage includes a 7-petabyte flash segment paired with 80 petabytes of conventional storage, both managed via the Lustre parallel file system. Additionally, a 30-petabyte data management layer based on Ceph is integrated. Collectively, this amounts to 117 petabytes of storage capacity and an aggregate input/output bandwidth reaching 2 terabytes per second.
Funding
The financing of LUMI is a joint effort between the EuroHPC Joint Undertaking and the LUMI Consortium, which comprises Finland, Belgium, Czech Republic, Denmark, Estonia, Iceland, Norway, the Netherlands, Poland, Sweden, and Switzerland. The overall investment totals €144.5 million.
Energy
Powered entirely by renewable hydroelectric energy, LUMI exemplifies environmental sustainability by utilizing its waste heat to provide heating for adjacent buildings. Situated on the grounds of a former UPM paper mill—an area recognized for its exceptional electrical grid stability with only one brief two-minute outage over 38 years—the supercomputer benefits from a highly reliable power supply.
Operation
Fifty percent of LUMI’s computing resources are dedicated to the EuroHPC Joint Undertaking, with an additional 20% allocated for industrial and SME applications. The remaining half is apportioned among member countries of the LUMI Consortium in proportion to their financial contributions.
By June 2021, pilot projects were chosen for the initial CPU partition, which commenced operations in September 2021. Full-scale functionality including GPU partitions was scheduled for rollout in 2022.
Naming
The term "LUMI" translates to "snow" in Finnish.