EuroHPC User Days 2025 + CI/CD Hackathon¶
The EuroHPC User Days 2025, which took place in Copenhagen (Denmark) was a great event to connect with the EuroHPC community.
Several members of the EESSI community participated, and we also organised an EESSI CI/CD hackathon directly afterwards on Thu 2 Oct 2025.
EuroHPC User Days 2025¶
Plenary sessions¶
The plenary sessions of the EuroHPC User Days 2025 featured representatives of both the EuroHPC Joint Undertaking (JU) and the EuroHPC community talking about current and upcoming activities.
Recordings of the plenary sessions are available: day 1, day 2.
The EuroHPC Federation Platform (EFP) was highlighted during the presentation on the EuroHPC supercomputer infrastructure:
The first version of the EuroHPC Federation Platform will be available in March 2026, and will include EESSI as the base for the Federated Software Catalogue (FSC) component.
See also our previous blog post on how EESSI will be integrated in the EuroHPC Federation Platform.
Networking¶
The networking sessions were of particular interest to us, since they allowed us to discuss EESSI and related topics with a various people from the EuroHPC Community.
Somewhat unexpectedly a stand was available during the Meet & Greet networking session for EuroHPC Centre-of-Excellence (CoE) projects. We took the opportunity as representatives of the MultiXscale to set up an improved info stand, where we also did live hands-on demos with EESSI.
During the networking sessions we engaged with various EuroHPC Hosting Entities, either about their experience with making EESSI available on the EuroHPC supercomputers they operate, or about their ongoing efforts to make EESSI available soon.
EESSI CI/CD hackathon¶
Next to attending the two-day EuroHPC User Days event we also organised an EESSI CI/CD hackathon at the same venue the day after, in collaboration with MultiXscale, CASTIEL2, NCC Denmark, and the Danish e-infrastructure Consortium (DeiC).
Initially we were a bit unsure whether or not this would attract enough interest, but in the end we filled all available seats for in-person attendees, and also had a bunch of remote attendees who followed via Zoom.
The hackathon started with a presentation by Alan O'Cais outlining how EESSI can be leveraged for Continunous Integration (CI) and Continuous Deployment (CD).
Presentation materials are available here.
During the hands-on session participants could "pick their own adventure", and decide for themselves whether they wanted to explore using EESSI in GitHub Actions or take up another challenge. Several members of the EESSI core team were available to answer questions and provide hands-on help to hackathon participants.
All in-person attendees received a free EESSI coffee mug as a token of appreciation for their participation in the hackathon.
Raspberry Pi Starter Kit Prize¶
The hackathon featured a Raspberry Pi starter kit prize, sponsored by Do IT Now, which was granted to the participant who made the most impressive progress during the hackathon.
More information on the EESSI CI/CD hackathon that was held in conjunction with the EuroHPC User Days 2025 is available here.
We hope to organise more sessions like this in the future!