Systems
CSC's computing environment consists of the national supercomputer Roihu, which replaced the retired Puhti and Mahti systems in 2026. In addition, CSC's data center in Kajaani hosts the pan-European pre-exascale supercomputer LUMI. The CPU-partition of LUMI has been available since early 2022, while the largest partition of the system consisting of GPU-accelerated nodes became available in 2023.
Roihu
The Roihu supercomputer, BullSequana XH3000 hybrid system, is CSC's national supercomputer, replacing the retired Puhti and Mahti systems. Roihu is designed as a versatile system for CPU and GPU computing, AI workloads, data-intensive research and applications requiring large memory.
Roihu consists of two main partitions: Roihu-CPU and Roihu-GPU that have separate login nodes and software environments. The CPU partition contains AMD EPYC CPUs, while the GPU partition is based on NVIDIA GH200 Grace Hopper Superchips. The system also includes special-purpose nodes for visualization and high-memory tasks, and will provide enhanced support for processing sensitive and confidential data.
LUMI
LUMI is one of the three European pre-exascale supercomputers. It's an HPE Cray EX supercomputer consisting of several partitions targeted for different use cases. The largest partition of the system is the "LUMI-G" partition consisting of GPU accelerated nodes using a future-generation AMD Instinct GPUs. In addition to this, there is a smaller CPU-only partition, "LUMI-C" that features AMD EPYC "Milan" CPUs and an auxiliary partition for data analytics with large memory nodes and some GPUs for data visualization. Besides partitions dedicated to computation, LUMI also offers several storage partitions for a total of 117 PB of storage space.
