The 2026 annual meeting of Exa-DI

The 2026 annual meeting of the Exa-DI project (Development and Integration) of the PEPR NumPEx took place on February 24 and 25^th at Espace Trinité, Paris.

The Exa-DI project is responsible for implementing the co-design and co-development process within NumPEx, with the aim of producing augmented and productive exascale software that is science-driven. In this context, Exa-DI has already organised three workshops: one on “Efficient discretisation for exascale EDPs”, another on “Block-structured AMR at exascale” and a third on “Artificial intelligence for exascale HPC”. These two-day in-person workshops brought together Exa-DI members, members of other NumPEx projects, teams demonstrating applications from various sectors of research and industry, and experts.

This meeting was first an opportunity to create the momentum between all the stakeholders involved in the co-design/co-development processes and second to strengthen their alignment. This is one of the main objectives of the Backlog sessions in which each co-design/co-development working groups (WGs) presented their roadmap for the next 2-3 month in order to establish, coordinate and organize the engineering activities of the CDT development team. Given the importance and cross-cutting nature of the topic across NumPEx, a presentation on «Task-based programming and its applications » was given by a leading expert from the Exa-SofT project. The Software packaging and deployment session organized with the participation of a regional (GriCAD) and all national computing centres (TGCC, IDRIS and CINES) provides the opportunity to discuss about packaging solutions (e.g., modules, Spack, Guix) with the aim of supporting code developers to port and deploy applications on various architectures, and in particular on leading exascale architectures. The CDT session provide an overview of the current engineering activities of the development CDT team given through four presentations, i.e Infrastructure for Benchmarking, Guix-Based Deployment and unified Kokkos Integration, High-Performance Spectral Element Operators on GPUs and Benchmarking Large Scale Inverse Problems Resolution Algorithms with Benchopt, which was followed by general discussions. Finally, in light of the recent workshop organized by GENCI following Alice Recoque’s procurement February 17-19, 2026), where collaborations between NumPeX, Bull and AMD were discussed, a specific session on possible Exa-DI/AMD/Bull collaborations was organized to, on the one hand, give feedback on the Bull/AMD workshop and, on the other hand, discuss the actions to be implemented to identify and start collaborations with AMD and Bull.

One of main goal of this meeting has been to brainstorm all together on collaboration patterns supporting the ramp-up of the Exa-DI project and their implementation through the co-design/co-development structures set-up in Exa-DI: the CDT, the co-design/co-development WGs, the WPs, …. A key point was to follow and check that the articulation and coordination of these different structures were carried out correctly and allowed to ensure the co-design/co-development process’s success. This is essential in order to prepare the porting of applications to exascale architectures and in particular to the next European leading exascale facility to be installed at the TGCC, Alice Recoque and open to users by the end of 2027.

• Introduction
  by Valérie Brenner, CEA research scientist
• Backlog session
  by Jérôme Charousset, CEA engineer
  • Roadmap Working group (WG) 1
    by Henri Calandra, Expert numerical methods and High Performance Computing at TotalEnergies
  • Roadmap WG2
    by Julien Vanharen, Inria research scientist
  • Roadmap WG3
    Maxime Delorme, CEA research scientist
  • Roadmap WG4
    Thomas Moreau, Inria research scientist
• Programmation par tâches et ses applications
  by Samuel Thibault, professor at Bordeaux University
• Sofware packaging and deployment session
  by Benoît Martin, Sorbonne University research scientist
  • Software packaging and deployment in Exa-DI
    by Benoît Martin, Sorbonne University research scientist
    and Bruno Raffin, Inria research scientist
  • Software packaging and deployment at GriCAD
    by Pierre-Antoine Bouttier, CNRS engineer
  • Software packaging and deployment at TGCC
    by Xavier Delaruelle, CEA manager and Laurent Nguyen, CEA engineer
  • Software packaging and deployment at IDRIS
    by Remi Lacroix, CNRS engineer
  • Software packaging and deployment at CINES
    by Gabriel Hautreux, HPC expert at CINES

• CDT session
  by Félix Kpadonou, CEA research scientist
  • Infrastructure for Benchmarking
    by Jérôme Charousset, CEA engineer
  • Guix-Based Deployment and unified Kokkos Integration
    by Aurélien Dauteuil, CEA engineer
  • High-Performance Spectral Element Operators on GPUs
    by Alexandre Roger, CNRS
  • Benchmarking Large Scale Inverse Problems Resolution Algorithms with Benchopt
    by Benoit Malézieux, CNRS research scientist
• AMD collaborations session
  by Jérôme Bobin, CEA research scientist

This face-to-face meeting brought together for one day the complete Exa-DI team – the members of each Work Package (WPs), the Program manager of the CDT, the CDT members, the leaders of the co-design/co-development Working groups (WGs) who are member of the Application Demonstrators (ADs) teams, members of others NumPEx projects of the (Exa-MA, Exa-SofT, Exa-DoST and Exa-AToW), as well as representatives from the national (IDRIS, TGCC, CINES) and regional (GriCAD,) computing centres and experts.

• Juliette Antonczack, Exa-MA, Université de Strasbourg
• Alexis Badel, Inria
• Rémi Baron, Exa-DI, CEA
• Baptiste Besnard, CNRS
• Julien Bigot, Exa-DI, Inria
• Jérôme Bobin, Exa-DI, CEA
• Pierre-Antoine Bouttier, CNRS
• Thomas Bouvier, Exa-DI, CEA
• Eric Boyer, Genci
• Valérie Brenner, Exa-DI, CEA
• Henri Calandra, AD, TotalEnergies
• Ansar Calloo, Exa-MA, CEA
• Mathieu Certenais, Exa-AToW, Université Rennes
• Aurélien Citrain, Inria
• Jérôme Charousset, Exa-DI, CEA
• Javier Cladellas, Exa-MA, Université Strasbourg

• Ludovic Courtes, Exa-DI, Inria
• Aurélien Dauteuil, Exa-DI, CEA
• Xavier Delaruelle, CEA
• Romain Denelle, EDF
• Maxime Delorme, AD, CEA
• Etienne Decossin, EDF
• Triem Phan Dinh, Exa-DI, CNRS
• Romain Garbage, Exa-DI, Inria
• Damien Gradatour, Exa-DoST, CNRS
• Virginie Grangirard, Exa-DoST, CEA
• Loïc Guoarin, Exa-MA, École Polytechnique
• Gabriel Hautreux, Université de Montpellier
• Skander Khiari, Exa-DI, CEA
• Chai Koren, EDF
• Félix Kpadonou, Exa-DI, CEA
• Rémi Lacroix, CNRS

• Pierre-François Lavallée, CNRS
• Guillaume Lechantre, Genci
• Benoît Malézieux, Exa-DI, CNRS
• Benoît Martin, Exa-DI, CEA
• Marc Antoine Miville-Deschênes, CNRS
• Thomas Moreau, GT IA, CEA
• Laurent Nguyen, CEA
• Augustin Parret-Freaud, Safran Tech
• Bruno Raffin, Exa-DI, Inria
• Alexandre Roger, Exa-DI, CNRS
• Pascal Tremblin, CEA
• Samuel Thibaut, Exa-SofT, Inria
• Jean-Pierre Vilotte, Exa-DI, CNRS
• Julien Vanharen, AD, Inria