Betzy

Named after Mary Ann Elizabeth (Betzy) Stephansen, the first Norwegian woman to be awarded a doctorate degree.

Betzy is a BullSequana XH2000, provided by Atos, and will give Norwegian researchers almost three times more capacity than previously, with a theoretical peak performance of 6.2 PetaFlops. The supercomputer is located at NTNU in Trondheim, and was set in production 24 November 2020. Betzy provides 1.5 billion CPU hours per year, and has a contracted operating time of four years (2024), with an optional one-year extension (2025).

Betzy also has a GPU partition and a preproc partition. The GPU partition consists of 4 nodes. Each node has 64 CPU cores, 512 GiB memory and 4 x Nvidia A100 GPUs with 40GB memory connected by NVLink. The Preproc partition consists of 6 nodes with 1 TiB RAM each.

Details	Betzy
System	BullSequana XH2000
Max Floating point performance, double	6.2 Petaflops
Number of CPU nodes	1344
CPU type	AMD® Epyc™ 7742 2.25GHz
CPU cores in total	172032
CPU cores per node	128
Memory in total	344 TiB
Memory per node	256 GiB
GPU type	Nvidia A100 40 GB with NVLink
Number of GPU nodes	4
GPUs per node	4
GPUs in total	16
Operating System	Red Hat Enterprise Linux 7
Total disc capacity	7.7 PB
Interconnect	InfiniBand HDR 100, Dragonfly+ topology
Top500 June 2020	55th place @ 1250 nodes, 76% efficiency

Almost all components are liquid cooled resulting in a very high cooling efficiency, 95% of heat being captured to water.