# Blog post on A64FX support in EESSI We're happy to announce that A64FX is now a fully supported CPU target in EESSI, in both EESSI versions (2023.06 and 2025.06). All software installations that are available for the [CPU microarchitectures that were already supported]() are now also built for A64FX systems. ```shell # pick an EESSI version to use: # - EESSI 2023.06 provides software installations with older versions of the foss compiler toolchain (2022b, 2023a, 2023b) # - EESSI 2025.06 provides software installations with recent versions of the foss compiler toolchain (2024a, 2025a) $ EESSI_VERSION=2023.06 # or EESSI_VERSION=2025.06 $ source /cvmfs/software.eessi.io/versions/${EESSI_VERSION}/init/lmod/bash ... archdetect says aarch64/a64fx ``` ## Relevance - Deucalion - Fugaku? ## Peculiarities of A64FX - limited availability (we rely on Deucalion) - SVE XXX-wide ## Building software on a A64FX system - HBM, limited amount of memory per core ## Software testing - see failing test(s?) in GROMACS that only occur on A64FX ## Acknowledgements MultiXscale MACC, Bernardo