Tetralith is NSC's largest HPC cluster. It replaced NSC's previous HPC cluster Triolith in 2018. Tetralith is funded by SNIC and uses for research by Swedish research groups. Access to Tetralith is granted by SNIC.
Tetralith consists of 1908 compute nodes each with two Intel Xeon Gold 6130 cpus with 16 CPU cores each, giving a total of 61056 CPU cores. The performance of the complete system is around 3 Pflop/s (LINPACK Rmax).
In June 2019, Tetralith was placed 74th on the TOP500 List.
There are 1832 "thin" nodes with 96 GiB of primary memory (RAM) and 60 "fat" nodes with 384 GiB. Each compute node has a local SSD disk where applications can store temporary files (approximately 200GiB per thin node, 900GiB per fat node).
All Tetralith nodes are interconnected with a 100 Gbps Intel Omni-Path network which is also used to connect to the existing disk storage. The Omni-Path network is similar to the FDR Infiniband network in Triolith (e.g still a fat-tree topology).
The hardware was delivered by ClusterVision B.V.
There are 170 nodes in Tetralith equipped with one NVIDIA Tesla T4 GPU each as well as an updated, high-performance NVMe SSD scratch disk of 2TB. The nodes are regular Tetralith thin nodes which have been retrofitted with the GPUs and disks, and are accessible to all of Tetralith's users. For details of this addition, see the Tetralith GPU User Guide.