![\"MattX](\"MattX-SSI-Live-Process-Migration2.jpeg\")
An interview on EESSI, as well as the impact of AI on the development and maintainers of open source sof...
", "image": null, "date_modified": "2026-10-08T15:22:49+00:00", "date_published": "2026-10-07T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/09/28/vote-hpcwire-award-again/", "url": "https://eessi.github.io/docs/blog/2026/09/28/vote-hpcwire-award-again/", "title": "Why you should vote for EESSI (again)", "content_html": "At the Supercomputing 2024 conference EESSI won an HPCWire Readers' Choice Award.
On 14 September 2026, EESSI got nominated again for the HPCWire Readers' Choice Award.
\nWe have not been sitting still, EESSI has continued to evolve significantly since late 2024.
\nIn this blog post we take a look at the progress that has been made, highlighting some of the recent developments, enhancements, and milestones.
\nRead on to see what has changed in EESSI since November 2024, and why we think that EESSI deserves your vote more than ever before... :smiling_face_with_3_hearts:
", "image": null, "date_modified": "2026-09-28T12:30:49+00:00", "date_published": "2026-09-28T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/09/20/hpcwire-readers-choice-awards-2026/", "url": "https://eessi.github.io/docs/blog/2026/09/20/hpcwire-readers-choice-awards-2026/", "title": "EESSI nominated (again) for HPCwire Readers\u2019 Choice Awards", "content_html": "EESSI has been nominated (again)\nfor the HPCwire Readers\u2019 Choice Awards,\nin the \"Best HPC Programming Tool or Technology\" category.
\nYou can help us win the award by joining the vote.
", "image": null, "date_modified": "2026-09-20T12:53:33+00:00", "date_published": "2026-09-20T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/09/08/testing-mattx-with-eessi/", "url": "https://eessi.github.io/docs/blog/2026/09/08/testing-mattx-with-eessi/", "title": "Testing MattX with EESSI", "content_html": "Almost 2 decades ago openMosix was the hottest open source Single System Image (SSI) cluster out there.\nOpenMosix could migrate long running processes across a cluster and thus effectively allowing HPC workloads to be spread \nacross a cluster or migrated to a node with more resources, with no changes to the code. \nThe project however never got a 2.6 kernel port and thus was EOL by early 2008.
\nEarlier this year Matt Rechenburg, one of the original openMosix community members released MattX, the Modern SSI Cluster , which brought \nback the openMosix vibes. MattX lacked a test suite and thus I had a suite build. Initially the Mattx Test suite just spun up a\nnumber of VM's and migrated basic processes around to validate the new releases. Working on that Test suite I wondered if it weren't a good idea to take let some real HPC workloads migrate around, and \nwhere better to find them than in the EESSI demo project.
\n
A fresh-install, end-to-end walkthrough on an Orange Pi RV2: reproduce a silent NaN\nfailure in the stock EESSI HPL, trace it to one RISC-V vector kernel, and fix it \u2014\ncorrect results \u2014 with a single eb --from-pr.
During the week of 22-26 June 2026, EESSI was part of the official program of the\nISC'26 conference in Hamburg (Germany)\nin various ways.
\nNext to the Introduction to EESSI half-day tutorial and a Birds-of-a-Feather (BoF) session we organized ourselves,\nEESSI was also featured prominently in two other BoF sessions, including the one on the EuroHPC Federation Platform.
\nIn addition, we gave presentations in two workshops, witnessed how EESSI got mentioned by speakers\nin other sessions, and had lots of interesting discussions with members of the HPC community at the ISC exhibit\nor when bumping into people in the hallway track.
", "image": null, "date_modified": "2026-07-06T14:45:03+00:00", "date_published": "2026-06-26T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}, {"name": "Alan O'Cais"}, {"name": "Lara Peeters"}, {"name": "Helena Vela Beltran"}, {"name": "Sebastian Achilles"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/05/12/lfoss-riscv/", "url": "https://eessi.github.io/docs/blog/2026/05/12/lfoss-riscv/", "title": "lfoss/2025b now available in the EESSI RISC-V stack", "content_html": "lfoss/2025b now available in the EESSI RISC-V stackThe EESSI RISC-V software stack available through the dev.eessi.io/riscv repository \nnow includes the lfoss/2025b toolchain.
This is an important milestone for the RISC-V enablement work in EESSI, since it brings a \nmodern LLVM-based software toolchain to the growing collection of software available for \nRISC-V systems through EESSI.
", "image": null, "date_modified": "2026-05-13T07:39:51+00:00", "date_published": "2026-05-12T00:00:00+00:00", "authors": [{"name": "Juli\u00e1n Morillo"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/05/11/EESSI-on-Cray-Slingshot-part2/", "url": "https://eessi.github.io/docs/blog/2026/05/11/EESSI-on-Cray-Slingshot-part2/", "title": "MPI at Warp Speed: EESSI Meets Slingshot-11(bis)", "content_html": "Building on our initial HPE/Cray Slingshot\u201111 results, we further refined MPI tuning and validated the setup using EESSI 2025.06.
\nThe outcome is a significant performance improvement, bringing MPI support in EESSI much closer to vendor tuned Cray MPI environments.
", "image": null, "date_modified": "2026-06-05T13:49:20+00:00", "date_published": "2026-05-11T00:00:00+00:00", "authors": [{"name": "Richard Topouchian"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/04/02/eessi-musica/", "url": "https://eessi.github.io/docs/blog/2026/04/02/eessi-musica/", "title": "Choosing EESSI as a base for MUSICA", "content_html": "MUSICA (Multi-Site Computer Austria) is the latest addition to Austria's\nnational supercomputing infrastructure. The system's compute resources\nare distributed across three locations in Austria: Vienna, Innsbruck,\nand Linz. We describe the process that led to the adoption of EESSI\nas a base for the software stack on the MUSICA system at the Austrian\nScientific Computing (ASC) research center.
", "image": null, "date_modified": "2026-04-02T18:28:09+00:00", "date_published": "2026-04-02T00:00:00+00:00", "authors": [{"name": "Adam McCartney"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/03/09/EESSI-in-EFP-update/", "url": "https://eessi.github.io/docs/blog/2026/03/09/EESSI-in-EFP-update/", "title": "Update on EESSI in EuroHPC Federation Platform", "content_html": "Since our blog post in Feb'25 announcing that EESSI will be integrated in the EuroHPC Federation Platform (EFP), we have been working hard on making this a reality.
\nThe Federated Software Catalog (FSC) component of EFP will use EESSI as a base. As a result, EESSI will soon be available on all EuroHPC supercomputers.
\nIn fact, EESSI is already available on the majority of them today!
", "image": null, "date_modified": "2026-09-07T10:38:04+00:00", "date_published": "2026-03-09T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}, {"name": "Alan O'Cais"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/02/05/Spack-on-top-of-EESSI-best-of-both-worlds/", "url": "https://eessi.github.io/docs/blog/2026/02/05/Spack-on-top-of-EESSI-best-of-both-worlds/", "title": "Using Spack on Top of EESSI: Best of Both Worlds", "content_html": "The HPC software landscape offers powerful tools for managing scientific software, such as EasyBuild and Spack.
\nEESSI provides a ready-to-use software stack with thousands of optimized software installations that were built with EasyBuild.
\nImagine you are working on an HPC system with EESSI already available. You have access to a wealth of optimized installations for scientific software packages, libraries, tools, as well as compilers. But you need to install a new tool or a specific version of a package that's not in EESSI yet.
\nYou can already extend EESSI with new software through the EESSI-extend module.\nThis utility provides you with a pre-configured EasyBuild installation that you can use to build packages from easyconfig files.
\nLike EasyBuild, Spack is a flexible build tool that also offers a vast repository of build recipes maintained by a large and active community, making it a familiar tool for many HPC users.\nBy enabling Spack to leverage software installations already available in EESSI as dependencies, we can offer users the best of both worlds: the convenience of a pre-built, optimized software stack combined with the flexibility to quickly build new packages using tools they already know.
", "image": null, "date_modified": "2026-02-09T14:34:51+00:00", "date_published": "2026-02-05T00:00:00+00:00", "authors": [{"name": "Loris Ercole"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/02/04/EESSI-at-FOSDEM-26/", "url": "https://eessi.github.io/docs/blog/2026/02/04/EESSI-at-FOSDEM-26/", "title": "EESSI at FOSDEM'26", "content_html": "This year's FOSDEM exceeded all expectations a first-time attendee like me could have. Filled with interesting talks, wide range of diverse people and impactful projects, I bring back home a bag full of stickers, lovely memories and some Belgian chocolates.
\nBringing EESSI and EMBL's computational community closer together during EMBL's CoDash hackathon.\nSimultaneously working towards bringing a large repository of scientific software in-use at EMBL's HPC cluster to EESSI.
", "image": null, "date_modified": "2026-02-17T18:23:42+00:00", "date_published": "2026-01-31T00:00:00+00:00", "authors": [{"name": "Renato Alves"}, {"name": "Anthony Fullam"}, {"name": "Stefano Marangoni"}, {"name": "Jure Pe\u010dar"}, {"name": "Thomas Weber"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2026/01/09/Spack-on-top-of-EESSI-PoC/", "url": "https://eessi.github.io/docs/blog/2026/01/09/Spack-on-top-of-EESSI-PoC/", "title": "Using Spack on top of EESSI: A Proof of Concept", "content_html": "EESSI provides a rich set of software installations, which were built and installed using\nEasyBuild.
\nCan we convince Spack to reuse software installed in EESSI,\nand by doing so make EESSI more attractive to those of you who prefer using Spack over EasyBuild?
\nSeveral people have expressed interest in exposing the software installations provided by EESSI\nto Spack, so they can be used as dependencies when building and installing software with Spack.
\nRecently, we have explored how this could be achieved through a proof-of-concept with QuantumESPRESSO.
\nThe goal here is to build and install only QuantumESPRESSO with Spack,\nand leveraging software installations from EESSI for all required dependencies, including the compiler and libraries for MPI, BLAS/LAPACK, FFTW, etc.
", "image": null, "date_modified": "2026-02-09T14:34:51+00:00", "date_published": "2026-01-09T00:00:00+00:00", "authors": [{"name": "Loris Ercole"}, {"name": "Alan O'Cais"}, {"name": "Kenneth Hoste"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/12/05/EESSI-on-K8s-PoC/", "url": "https://eessi.github.io/docs/blog/2025/12/05/EESSI-on-K8s-PoC/", "title": "EESSI on Kubernetes: A Proof of Concept", "content_html": "Kubernetes, also known as K8s, is an open-source container orchestration platform widely used for automating the deployment, scaling, and management of containerized applications.\nNormally, deploying a specific application on Kubernetes requires preparing a container image including the target software and all its dependencies.\nFurthermore, the software should be optimized depending on the target hardware architecture to achieve the best performance, which could prove particularly challenging especially on heterogeneous systems.\nImplementing an integration of EESSI with Kubernetes will allow the many sites and enterprises that already use K8s to more easily get access to a wide variety of optimized software installations.
\nIn this blog post, we present a proof of concept (PoC) for deploying EESSI on a Kubernetes cluster.
", "image": null, "date_modified": "2025-12-08T11:56:55+00:00", "date_published": "2025-12-05T00:00:00+00:00", "authors": [{"name": "Davide Grassano"}, {"name": "Alan O'Cais"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/12/04/gh-ci-workflow-for-EESSI/", "url": "https://eessi.github.io/docs/blog/2025/12/04/gh-ci-workflow-for-EESSI/", "title": "GitHub CI/CD workflows with EESSI", "content_html": "In a previous blog post, \u201cAn example CI workflow that leverages EESSI CI tools\u201d,\nPedro Santos Neves explained how to set up a GitLab CI workflow.\nThis post will focus on GitHub CI workflows and show how to access the development repository of EESSI.
", "image": null, "date_modified": "2026-02-04T20:31:23+00:00", "date_published": "2025-12-04T00:00:00+00:00", "authors": [{"name": "Jean-No\u00ebl Grad"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/11/14/EESSI-on-Cray-Slingshot/", "url": "https://eessi.github.io/docs/blog/2025/11/14/EESSI-on-Cray-Slingshot/", "title": "MPI at Warp Speed: EESSI Meets Slingshot-11", "content_html": "High-performance computing environments are constantly evolving, and keeping pace with the latest interconnect technologies is crucial for maximising application performance. However, we cannot rebuild all the software in EESSI that depends on improvements to communication libraries. So how do we take advantage of new technological developments?
\nSpecifically we look at taking benefit of the HPE/Cray Slingshot-11.\nSlingshot-11 promises to offer a significant advancement in HPC networking, offering improved bandwidth, lower latency, and better scalability for exascale computing workloads ... so\nthis should be worth the effort!
\nIn this blog post, we present the requirements for building OpenMPI 5.x with Slingshot-11 support on HPE/Cray systems and its integration with EESSI using the host_injections\nmechanism of EESSI to inject custom-built OpenMPI libraries. This approach enables overriding EESSI\u2019s default MPI library with an ABI-compatible, Slingshot-optimized version which should give us optimal performance.
", "image": null, "date_modified": "2026-06-05T13:49:20+00:00", "date_published": "2025-11-14T00:00:00+00:00", "authors": [{"name": "Richard Topouchian"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/10/22/eosc/", "url": "https://eessi.github.io/docs/blog/2025/10/22/eosc/", "title": "EESSI available on EOSC EU Node", "content_html": "EESSI has recently been working together with the European Open Science Cloud (EOSC) to provide easy access to EESSI for those using EOSC compute resources.
\nA first implementation of EESSI support is now available as the EESSI Compute Node tool in the EOSC EU Node Tools Hub.
", "image": null, "date_modified": "2025-11-04T10:18:26+00:00", "date_published": "2025-10-22T00:00:00+00:00", "authors": [{"name": "Alan O'Cais"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/10/20/eurohpc-user-day-2025/", "url": "https://eessi.github.io/docs/blog/2025/10/20/eurohpc-user-day-2025/", "title": "EuroHPC User Days 2025 + CI/CD Hackathon", "content_html": "The [EuroHP...
", "image": null, "date_modified": "2026-01-11T10:10:09+00:00", "date_published": "2025-10-20T00:00:00+00:00", "authors": [{"name": "Kenneth Hoste"}, {"name": "Alan O'Cais"}, {"name": "Thomas R\u00f6blitz"}, {"name": "Helena Vela Beltran"}, {"name": "Lara Peeters"}, {"name": "Petra Pape\u017e"}], "tags": []}, {"id": "https://eessi.github.io/docs/blog/2025/08/07/rocm/", "url": "https://eessi.github.io/docs/blog/2025/08/07/rocm/", "title": "ROCm Integration Progress: Core Components Ready for EasyBuild Release", "content_html": "Following our previous posts on mapping the ROCm ecosystem and building ROCm support in EESSI, we're excited to share a significant milestone in our ROCm integration journey.\nOur core ROCm components are now hardware-validated and nearly ready for inclusion in EasyBuild, marking substantial progress toward making AMD GPU computing more accessible through EESSI.
", "image": null, "date_modified": "2025-08-07T07:52:57+00:00", "date_published": "2025-08-07T00:00:00+00:00", "authors": [{"name": "Anthony Beerens"}, {"name": "Kenneth Hoste"}, {"name": "Alan O'Cais"}], "tags": []}]}