We have entered the exascale era of high-performance computing (HPC), and with it comes the challenge of writing software that can achieve high performance on a wide variety of heterogeneous architectures. The Kokkos Ecosystem is a performance portability solution which addresses that challenge through a single source C++ programming model that follows modern software engineering practices. Accompanied by a suite of libraries for fundamental computational algorithms as well as tools for profiling and debugging, Kokkos is a productive framework to write sustainable software.
Today Kokkos arguably provides the leading non-vendor provided programming model for HPC exascale applications. Developed and maintained by a multi-institutional team of HPC experts, Kokkos is relied on by scientist and engineers from well over 100 institutions to help them leverage modern HPC systems.
This talk will provide an overview of Kokkos and its benefits for performance portability and software sustainability. We will also present the Kokkos’ team vision for a community driven future of the project.

Damien Lebrun-Grandié is a Computational Scientist with Oak Ridge National Laboratory. His research focus on the development of algorithms and enabling technologies for the solution of large-scale complex engineering and scientific problems. He is a high-performance computing expert and is a member of the ISO C++ Standards Committee. He co-leads the Kokkos performance portability library team. He holds a MEng in Applied Physics from Grenoble INP in France, and a MSc in Physics from Karlruhe Institute of Technology in Germany. He completed his PhD in Nuclear Engineering from Texas A&M University.

Christian Trott is a high performance computing expert with extensive experience in designing and implementing software for modern HPC systems. He is a principal member of staff at Sandia National Laboratories, where he co-leads the Kokkos core team developing performance portability solutions for engineering and science applications. Christian is also the head of Sandia’s delegation to the ISO C++ standards committee, and a principal author of C++ standard features such as mdspan and linear algebra support. He also serves as adviser to numerous application teams, helping them redesign their codes using Kokkos and achieve performance portability for the next generation of supercomputers.
In the past Christian contributed significantly to numerous scientific software projects such as Trilinos and LAMMPS. He earned a doctorate from the University of Technology Ilmenau in theoretical physics with a focus on computational material research.

The CExA project aims to facilitate the CEA’s transition to Exascale computing and GPU-based calculations through an Exascale Computing software catalyst. This middleware leverages the computing power of Exaflop machines, ensures performance portability, and incorporates proven technologies such as the open-source Kokkos library. Diverse demonstrators from different CEA departments are showcased during the implementation process to demonstrate the software catalyst’s capabilities.

Fabien Baligand is a researcher in computer science at CEA – Technological Reseach Division. Fabien has worked in Cloud Computing, in diverse organizations like Microsoft, Thales and startups. He holds a PhD in the field of Service Oriented Computing.

Edouard Audit studied physics at the Ecole Normale Supérieure de Paris-Saclay and received a PhD in theoretical physics from university Paris 7 in 1997. He worked at the Paris observatory in the field of numerical cosmology and large scale structure formation. He then joined CEA were he has been developing massively parallel codes to study star formation, interstellar medium and laser generated plasmas. In 2010, he was appointed as the founding director of Maison de la Simulation (MdS), a joint laboratory between CEA, CNRS and the universities of Paris-Saclay and Versailles-St Quentin. The mission of MdS is to foster the usage of HPC for scientific discovery. Edouard Audit is also professor at INSTN and teaches computational astrophysics and parallel computing. He is the coordinator of the EU-funded Energy Oriented Centre of Excellence – EoCoE. He has more than 80 publications in peer reviewed journals.

To prepare the BigDFT code – a highly precise wavelet-based implementation of Kohn-Sham DFT – for the nascent Aurora system, we ported it to SYCL. More precisely, we developed a SYCL code for an efficient Fock operator application, which is a highly accurate computational method of electronic structure calculations. In this session, we give an overview of SYCL and present our approach to porting the CUDA code in BigDFT to SYCL. In addition, we introduce Intel oneAPI and the novel Intel Data Center GPUs Max 1550, which is the device targeted with our approach. Finally, we demonstrate the performance of our SYCL implementation of the Fock operator application on Intel Data Center GPUs Max 1550 as well as 4th Generation Intel Xeon.

Christoph Bauinger is an Application Engineer at Intel, where he optimizes CFD, ML, DFT, and various other scientific workloads for Intel accelerators. Prior to joining Intel in September 2022, he was awarded his PhD in Applied Mathematics by the California Institute of Technology for developing a novel algorithm for the solution of scattering problems, the IFGF method.

The HPC, HPDA and AI ecosystem is undergoing a major technological and use shift on its road to the Exascale, which mandates a radical re-design of the software stack and the application codes. In this context, the French Exascale program NumPEx, a 6-years national project, aims at designing and developing the software components that will equip future exascale machines. It will contribute to bridge the gap between cutting-edge software developments and application domains to prepare the major scientific and industrial application codes to fully exploit the capabilities of these machines. One the major deliverables of NumPEx will be an Exascale-grade software stack. During this presentation, we will present the organisation of the NumPEx program with a particular on software production and the long-term sustainability of the NumPEx production.

Jérôme Bobin received his Ph.D. from Paris-Sud University (now Paris-Saclay University) (France) in 2008 in Computer Science. From 2008 to 2010, he has been a postdoctorate fellow in the applied mathematics department at the California Institute of Technology, and then in the mathematics department at Stanford University. From 2010, he is a researcher at CEA/IRFU. From 2010 to 2021, he has been member of the CosmoStat laboratory, and co-lead of the laboratory from 2014 to 2021. Since 2021, he is research director in the LILAS (Laboratoire d’Ingénierie Logicielle pour les Applications Scientifiques) at IRFU. From 2012 to 2014, he has been the principal investigator of the ANR project MultID, in collaboration with SAGEM. From 2016 to 2021, he has been the principal investigator of the LENA project, funded by the ERC (Starting Grant programme), devoted to the development of machine learning solutions in the scope of signal processing, with applications in Astrophysics. In 2021, he received, with his collaborators, the « Prix de la Recherche LNE » for his work on data analysis applied to nuclear physics. Since 2022, he is co-director of the NumPEx, a 6-years, 40 MEuros project focusing on high performance numerics for the Exascale.
His research interests are in signal and image processing, machine learning, statistics, massive data analysis, and their applications in physics, with a special emphasis on astrophysic and nuclear physics. From 2006 to 2015, he has been member of the ESA/Planck consortium, where he actively partipated to the analysis and exploitation of the Planck data. He is member of the ESA/LISA consortium and he participates actively to the ESA/Athena space mission.

Open Science is a tidal wave that will have a deep and long lasting impact on the way we conduct, share and evaluate research. Awareness is rising about the fact that open source software has a key role to play, on par with open access to research articles and data, and that it comes with specific challenges. In this talk we will survey recent policy news, report on ongoing national and international efforts, and explore in depth the approach taken by the Software Heritage initiative to preserve, reference and share all the publicly available source code, providing immediately actionable means to support the Software Pillar of Open Science.

An alumnus of the Scuola Normale Superiore di Pisa, with a PhD in Computer Science from the University of Pisa, Roberto Di Cosmo was associate professor for almost a decade at Ecole Normale Supérieure in Paris. In 1999, he became a Computer Science full professor at University Paris Diderot, where he was head of doctoral studies for Computer Science from 2004 to 2009. President of the board of trustees and scientific advisory board of the IMDEA Software institute and chair of the Software chapter of the National Committee for Open Science in France, he is currently on leave at Inria.

His research activity spans theoretical computing, functional programming, parallel and distributed programming, the semantics of programming languages, type systems, rewriting and linear logic, and, more recently, the new scientific problems posed by the general adoption of Free Software, with a particular focus on static analysis of large software collections. He has published over 20 international journals articles and 50 international conference articles.

In 2008, he has created and coordinated the european research project Mancoosi, that had a budget of 4.4Me and brought together 10 partners to improve the quality of package-based open source software systems.

Following the evolution of our society under the impact of IT with great interest, he is a long term Free Software advocate, contributing to its adoption since 1998 with the best-seller Hijacking the world, seminars, articles and software. He created in October 2007 the Free Software thematic group of Systematic, that helped fund over 50 Open Source research and development collaborative projects for a consolidated budget of over 200Me. From 2010 to 2018, he was director of IRILL, a research structure dedicated to Free and Open Source Software quality.

He created in 2015, and now directs Software Heritage, an initiative to build the universal archive of all the source code publicly available, in partnership with UNESCO.

We know that the digital sector must integrate energy criteria into its approach in order to limit its cost, limit its environmental impact and improve its image. This applies in particular to the HPC/AI field, which must integrate the Energy-To-Solution paradigm. This new optimization paradigm requires, first and foremost, simple and reliable acquisition of energy data. This is what DENERGUM solutions provide today. We will conclude with DENERGIUM’s vision for energy optimization in the years to come.