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Finnish supercomputers: Mahti and Puhti

A supercomputer is an important research tool in modern science. Supercomputer simulations enable quick and cost-effective research of phenomena that would otherwise be expensive or difficult, or even impossible, to study.

Supercomputing will be widespread in all fields of science

Finland’s national supercomputers comprise CSC’s Mahti and Puhti, together with their artificial intelligence partitions Mahti-AI and Puhti-AI. Supercomputer users – researchers at higher education institutions and research institutes – need the enormous computing power of supercomputers to conduct cutting-edge research in many data and computing intensive disciplines, such as pharmaceutical research and climate sciences.

The use of supercomputers, or high-performance computing, is becoming more widespread in all fields of science, and access to efficient computing resources significantly speeds up research. Higher education institutions also use supercomputers for teaching purposes.

Mahti is a robust supercomputer which was deployed in CSC’s national computing environment in August 2020. Mahti is intended for medium and large scale simulations that require high computing performance and a very fast interconnection network. Mahti’s GPU accelerated partition, Mahti-AI, is intended specifically for big data processing, AI research and AI applications.

Puhti is a general-purpose supercomputer deployed in September 2019. It is highly suitable for a wide range of uses from interactive data analysis to medium scale simulations. A wide range of scientific software has been installed on Puhti, ready for scientists to use. Puhti also has a partition for AI use, or Puhti-AI.

Web interfaces built for both supercomputers (puhti.csc.fi, mahti.csc.fi) make them easy to use. Researchers can log into CSC’s customer portal at my.csc.fi to apply for access to supercomputing resources.

CSC’s next supercomputer, Roihu, will replace Mahti and Puhti during 2026.

More about Mahti and Puhti

CSC’s Mahti supercomputer is a BullSequana XH2000 system manufactured by Atos. Its CPU partition reaches 7.5 petaflops, or 7.5 quadrillion operations per second. The performance of Mahti-AI (GPU) is 2.0 Pflop/s. In total, Mahti has approx. 180,000 cores (CPU), and its processors are linked by a 200 Gbps interconnect network.

Puhti’s CPU partition achieves 1.8 Pflop/s performance, and the speed of its GPU-accelerated AI is 2.7 Pflop/s. Puhti is an X400 system manufactured by Atos.