The European Environment for Scientific Software Installation

EESSI is an innovative service to make optimized scientific software installations available on any machine anywhere in the world in near real-time - without the need to build or install the software. They work similarly to popular streaming services for videos and music.

For the impatient, the single command to get access to EESSI (on NRIS operated systems) is just

module load EESSI/2023.06

Thereafter, software can be used via environment modules, for example,

module load GROMACS/2024.1-foss-2023b

just like it would be used with a traditionally provided installation.


When loading the EESSI module and using software provided by EESSI for the first time, one may experience a delay because data might need be downloaded from a remote server. EESSI uses CernVM-FS as distribution technology. CernVM-FS employs caching at various levels to provide good startup performance (shown to be equal or better than when software is hosted on a local parallel filesystem, see Performance aspects of CernVM-FS).

Read more about EESSI

Getting support for EESSI

More information about EESSI: