---
# System prepended metadata

title: Blog post on A64FX support in EESSI

---

# 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