CONCACE (home)

To tackle challenges posed by extensive scale and dimensionality in both model- and data-driven applications, we'll leverage contemporary development tools and languages to craft high-level expressions of advanced parallel numerical algorithms. While conventional high-performance computing (HPC) strategies emphasize maximizing hardware utilization, our alternative approach will enable a richer composability, thereby harnessing the full potential of both existing and novel numerical algorithms.

• Project-team title: COmposabilité Numérique et parallèle pour le CAlcul haute performanCE
• Acronym: concace (see also administrative reference resource)

The concace project is a joint Inria-Industry team involving members from two private partners, namely, Airbus Central R&T and Cerfacs.

The permanent members possess extensive expertise in parallel computational science, each emphasizing distinct aspects within computer science and applied mathematics. The team comprises individuals from varied academic and professional backgrounds, rendering it diverse and multidisciplinary, with a broad range of skills and knowledge.

This joint initiative was strongly motivated by the common scientific interests and their shared view of research actions.

You can check out our activity reports.

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• Emmanuel Agullo, research scientist, Inria
• Flavie Blondel, team assistant, Inria
• Pierre Benjamin, research project leader modelling & simulation, Airbus Central R&T
• Olivier Coulaud, senior research scientist, Inria
• Jean-Marie Couteyen, software scientist, Airbus Central R&T
• Luc Giraud, senior research scientist, PI for Inria
• Sofiane Haddad, senior scientist modelling & simulation, Airbus Central R&T
• Carola Kruse, senior researcher, PI for Cerfacs
• Paul Mycek, senior researcher, Cerfacs
• Guillaume Sylvand, Research Project Leader Modelling & Simulation, PI for Airbus Central R&T

• Esragul Korkmaz, Inria-Airbus Central R&T, from Oct. 2024
• Augustin Leclerc, Inria from Jan. 2025
• Stojche Nakov, Inria - H2020 EoCoE-III, from Sept. 2024
• Yanfei Xiang, Inria from Nov. 2023

• El-Mehdi Attaouchi, Edf, from Mar. 2022
• Théo Briquet, Inria from Nov. 2023
• Hugo Dodelin, Inria from Oct. 2024
• Antoine Gicquel, Inria - ANR Diwina, from Nov. 2023
• Alexandre Malhéné, Inria from Oct. 2024
• Clément Peaucelle, Inria-Airbus Central R&T, from Jan. 2025
• Sai Aakash Dasar, Cerfacs from Aug. 2024
• Atte Torri, LISN (co-advised with O. Kaya, LISN), from Dec. 2021
• Amine Zekri, Laplace (co-advised with J.R. Poirier, Laplace), from Nov. 2023

• Ludovic Courtes Inria, sed, part time
• Gilles Marait, Inria, sed
• Florent Pruvost Inria, sed, part time

• Yakine Rachedi, Airbus Central R&T, from Sep. 2024

• Luciano Drozda, Senior researcher Cerfacs
• Oguz Kaya, LISN, Saclay, Associate Professor
• Jean René Poirier (HDR), INP Toulouse, Associate Professor
• Ulrich Rüde, Friedrich-Alexander-Universität, Erlangen-Nürnberg, Germany and Cerfacs

• Guillaume Dindart, Inria, intern M1 05/24-08/2024
• Hugo Dodelin, Inria pre-doctoral student 05/2024-09/2024
• Marek Felsoci, Inria-Airbus Central R&T, PhD, 2019-2023, manuscript available here
• Pierre Esterie, Inria engineer, 2019-2023
• Karim Mohamed El Maarouf, PhD with IFPEN, 2019-2023, manuscript soon available
• Aurélien Gauthier, Inria, intern M1 05/24-08/24
• Hadrien Goddé, Cerfacs, post-doc, 2022-2023
• Martina Iannacito, Inria, PhD, 2019-2022, manuscript available here
• Marwin Lasserre, Inria-Airbus Central R&T, post-doc, 2022-2024
• Antoine Jego, IRIT (co-advised with A. Buttari (CNRS) and A. Guermouche (Topal team), PhD 2020-2023, manuscript available here
• Alexandre Malhéné, Inria, intern M2 03/2024-08/24
• Romain Peressoni, Inria/Région, PhD 2019-2021, manuscript available here
• Maksym Shpakovych , Inria-Airbus Central R&T, post-doc 2022-2023
• Nicolas Venkovic, Cerfacs, PhD 2018-2022
• Yanfei Xiang, Inria-Cerfacs, PhD, 2019-2022, manuscript available here

There is currently an open engineer position in the context of the The French program dedicated to Exascale (NumPEx). Read and join the composyx development team!

There is currently an open position for a two years post-doc at the Inria Center of Bordeaux University to work in the field of Numerical Linear Algebra on low-rank approximation algorithms. The job offer is here.

• Solving sparse linear systems using Krylov's modular and adaptive mixed-precision methods, collaboration with LIP6 in the context of the PEPR Numpex, for more details see here
• Backward stability analysis of numerical linear algebra kernels using normwise-perturbation, collaboration with LIP6 in the context of the PEPR Numpex, for more details see here
• Composability of execution models, for more details see here
• Unsupervised learning using spectral approaches, in collaboration with IRIT, for more details see here
• Abstraction of Krylov-type subspace methods, for more details see here
• Unification of hierarchical methods for linear systems processing, for more details see here
• Fault-tolerant numerical iterative algorithms at scale, collaboration with ENS Lyon in the context of the PEPR Numpex, for more details see here

Over the past few decades, there have been innumerable science, engineering and societal breakthroughs enabled by the development of high performance computing (HPC) applications, algorithms and architectures. These powerful tools have enabled researchers to find computationally efficient solutions to some of the most challenging scientific questions and problems in medicine and biology, climate science, nano­technology, energy, and environment – to name a few – in the field of model-driven computing.

Meanwhile the advent of network capabilities and IoT, next generation sequencing, … tend to generate a huge amount of data that deserves to be processed to extract knowledge and possible forecasts. These calculations are often referred to as data-driven calculations.

These two classes of challenges have a common ground in terms of numerical techniques that lies in the field of linear and multi-linear algebra. They do also share common bottlenecks related to the size of the mathematical objects that we have to represent and work on; those challenges retain a growing attention from the computational science community. Get onboard and Enter the Matrix with Us!

In this context, the purpose of the concace project, is to contribute to the design of novel numerical tools for model-driven and data-driven calculations arising from challenging academic and industrial applications. The solution of these challenging problems requires a multidisciplinary approach involving applied mathematics, computational and computer sciences. In applied mathematics, it essentially involves advanced numerical schemes both in terms of numerical techniques and data representation of the mathematical objects (e.g., compressed data, low-rank tensor, low-rank hierarchical matrices). In computational science, it involves large-scale parallel heterogeneous computing and the design of highly composable algorithms.

Through this approach, the concace project intends to contribute across all stages ranging from the design of new robust and accurate numerical schemes to the flexible implementation of the corresponding algorithms for modern supercomputers. To address these research challenges, researchers from Airbus Central R&T, Cerfacs and Inria have decided to combine their skills and research efforts within the concace project-team.

The project will enable us to address the complete range of issues, spanning from fundamental methodological considerations to thorough validations on demanding industrial test cases. Collaborating on this joint project will foster genuine synergy between fundamental and practical research, offering complementary advantages to all participating partners.

• High Performance Spacecraft Plasma Interaction Software
  • Acronym: HSPIS
  • Duration: 2022 - 2024
  • Funding: ESA
  • Coordinator: ONERA
  • Partners: Airbus DS, Artenium, Inria
  • Summary: Controlling the plasma environment of satellites is a key issue for the nation in terms of satellite design and propulsion. Three-dimensional numerical modelling is thus a key element, particularly in the preparation of future space missions. The SPIS code is today the reference in Europe for the simulation of these phenomena. The methods used to describe the physics of these plasmas are based on the representation of the plasma by a system of particles moving in a mesh (here unstructured) under the effect of the electric field which satisfies the Poisson equation. ESA has recently shown an interest in applications requiring complex 3D calculations, which may involve several tens of millions of cells and several tens of billions of particles, and therefore in a highly parallel and scalable version of the SPIS code.
• Massively parallel sparse grid PIC algorithms for low tempertaure plasma simulations
  • Acronym: Maturation
  • Duration: 2022 - 2026
  • Funding: ANR
  • Coordinator: Laplace
  • Partners: IMT, Inria, Maison de la simulation
  • Summary: the project aims at introducing a new class of PIC algorithms with an unprecedented computational efficiency, by analyzing and improving, parallelizing and optimizing as well as benchmarking, in the demanding context of partially magnetized low temperature plasmass through 2D large scale and 3D computations, a method recently proposed in the literature, based on a combination of sparse grid techniques and PIC algorithm.
• Magnetic Digital Twins for Spintronics : nanoscale simulation platform
  • Acronym: Diwina
  • Duration: 2022 - 2026
  • Funding: ANR
  • Coordinator: Institut Néel
  • Partners: CMAP, Inria, Spintec
  • Summary: The DiWiNa project aims at developing a unified open-access platform for spintronic numerical twins, ie, codes for micromagnetic/spintronic simulations with sufficiently-high reliability and speed so that they can be trusted and used as reality. The simulations will be bridged to the advanced microcopy techniques used by the community, through plugins to convert the statics or time-resolved 3D vector- fields into contrast maps for the various techniques, including their experimental transfer functions. To achieve this, we bring together experts from different disciplines to address the various challenges: spintronics for the core simulations, mathematics for trust, algorithmics for speed, experimentalists for the bridge with microscopy. Practical work consists of checking the time-integration stability of spintronic torque involved in the dynamics when implemented in the versatile finite-element framework, improve the calculation speed through advanced libraries, build the bridge with microscopies through rendering tools, and encapsulate these three key ingredients into a user-friendly Python ecosystem. Through open-access and versatile user-friendly encapsulation, we expect that this platform is suited to serve the needs of the entire physics and engineering community of spintronics. The platform will be unique in its features, ranging from simulation to the direct and practical comparison with experiments. It will contribute to reduce considerably the number of experimental screening for the faster development of new spintronic devices, which are expected to play a key role in energy saving.
• Low rank tensor decomposition for fast electromagnetic modeling of electrical engineering devices
  • Acronym: tensorVIM
  • Duration: 2022 - 2026
  • Funding: ANR
  • Coordinator: Laplace
  • Partners: G2ELab, Inria
  • Summary: This project aims to develop powerful calculation tools for the rapid implementation of electromagnetic simulations of electrical engineering devices using volume integral methods. These techniques based on a tensor writing of the numerical resolution have recently been applied to integral methods and make it possible to reduce the complexity of the calculations and to avoid an increase in the dimension.

• Centre of Excellence (EoCoE-III)

  • Acronym: Energy oriented Centre of Excellence for computer applications
  • Duration: 2024-2026
  • Funding: Euro-HPC
  • Coordinator: datamove Inria
  • Partners: Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile (Italy), Barcelona supercomputing center - centro nacional de supercomputacion (Spain), Centre europeen de recherche et de formation avancee en calcul scientifique (France), Centre national de la recherche scientifique CNRS (France), Commissariat a l energie atomique et aux energies alternatives (France), Consiglio nazionale delle ricerche (Italy), Forschungszentrum Julich GmbH (Germany), Fraunhofer gesellschaft zur foerderung der angewandten forschung e.V. (Germany), Max-Planck-gesellschaft zur forderung der wissenschaften e.V. (Germany), Rheinisch-westfaelische technische hochschule Aachen (Germany), Universita degli studi di Roma Torvergata (Italy), Universita degli studi di Trento (Italy), Universite libre de Bruxelles (Belgium), Universite Paris-Sud (France)

  -Summary: The Concace team (Inria, Cerfacs) participates in the Energy-oriented Centre of Excellence (EoCoE-III), starting in January 2024. The project applies cutting-edge exascale computational methods in its mission to accelerate the transition to the production, storage and management of clean, decarbonized energy. EoCoE-III is anchored in the High Performance Computing (HPC) community and targets research institutes and key commercial players who develop and enable energy-relevant numerical models to be run on exascale supercomputers, demonstrating their benefits for the net-zero energy transition. The project will draw on the experience of two successful previous projects EoCoE-I and -II, where a large set of diverse computer applications from four such energy domains achieved significant efficiency gains thanks to a multidisciplinary expertise in applied mathematics and supercomputing. EoCoE-III channels its efforts into 5 exascale lighthouse applications in the low-carbon sectors of Energy Materials, Water, Wind and Fusion. This multidisciplinary effort will harness innovations in computer science and mathematical algorithms within a tightly integrated co-design approach to overcome performance bottlenecks and to anticipate HPC hardware developments. A world-class consortium of 16 complementary partners forms a unique network of expertise in energy science, scientific computing and HPC, including 3 leading European supercomputing centres.

• A network for supporting the coordination of High-Performance Computing research between Europe and Latin America
  • Acronym: RISC2
  • Duration: 2021 - 2023
  • Funding: H2020
  • Coordinator: atlantis Inria
  • Partners: orschungzentrum Julich GMBH (Germany), {{inriai}} (France), Bull SAS (France) , INESC TEC (Portugal), Universidade de Coimbra (Portugal), CIEMAT (Spain), CINECA (Italy), Universidad de Buenos Aires (Argentina), Universidad Industrial de Santander (Columbia), Universidad de le Republica (Uruguay), Laboratorio Nacional de Computacao Cientifica (Brazil), Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional (Mexico), Universidad de Chile (Chile), Fundacao Coordenacao de Projetos Pesquisas e Estudos Tecnologicos COPPETEC (Brazil), Fundacion Centro de Alta Tecnologia (Costa Rica)
  • Summary: Recent advances in AI and the Internet of things allow high performance computing (HPC) to surpass its limited use in science and defence and extend its benefits to industry, healthcare and the economy. Since all regions intensely invest in HPC, coordination and capacity sharing are needed. The EU-funded RISC2 project connects eight important European HPC actors with the main HPC actors from Argentina, Brazil, Chile, Colombia, Costa Rica, Mexico and Uruguay to enhance cooperation between their research and industrial communities on HPC application and infrastructure development. The project will deliver a cooperation roadmap addressing policy- makers and the scientific and industrial communities to identify central application areas, HPC infrastructure and policy needs.

Our team is distributed across three locations, working collaboratively to achieve our goals.