Damien L-G

Damien L-G

Computational Scientist

Talks and presentations

Kokkos User Group Meeting: Opening Session & Kokkos Ecosystem Update

March 19, 2026

User Group Meeting, HPSF Conference 2026, Chicago, Illinois, USA

To kick off the 4th edition of the Kokkos User Group meeting, Christian and I co-presented an opening session that looked at the “big picture” of our ecosystem before diving into the technical specifics of the Core library. With the meeting collocated with the HPSF Conference this year, it was a perfect opportunity to showcase how Kokkos is anchoring the broader high-performance software landscape.

Performance Portability for People: The Kokkos Community Playbook

March 18, 2026

Presentation, HPSF Conference 2026, Chicago, Illinois, USA

We often talk about Kokkos in terms of performance portability across hardware, but as the project has grown into a global ecosystem, we’ve realized that “institutional portability” is just as vital. It’s one thing to run code on any GPU; it’s another thing to ensure a developer at a university in Europe or a lab in the US can contribute just as easily as the original creators.

HPSF Project and Ecosystem Growth Session: Kokkos Project Update

March 16, 2026

Presentation, HPSF Conference 2026, Chicago, Illinois, USA

For the second edition of the HPSF Conference, the community returned to downtown Chicago to discuss the state of the high-performance software ecosystem. In this session, I provided a comprehensive update on the Kokkos Project’s progress over the past year, reflecting on our growth within the foundation and our continued mission to provide performance portability for the world’s largest supercomputers.

Kokkos Quo Vadis: Shaping the Future of the Ecosystem

February 12, 2026

BoF Session & Panel, CASS BoF Days, Oak Ridge, Tennessee, USA

I co-organized and led this “Birds-of-a-Feather” session for the Consortium for the Advancement of Scientific Software (CASS). The event centered on a strategic roadmap discussion for the Kokkos Ecosystem, moderated by Mike Heroux (former Director of Software Technology for the US Exascale Computing Project).

Exascale Frontiers: CEA and DOE partnerships in HPC and simulation

February 10, 2026

Invited Roundtable Discussion, CEA 80th anniversary celebration at the French Embassy, Washington, DC, USA

I was honored to be invited to the French Embassy in Washington, D.C., to participate in a special roundtable celebrating the 80th anniversary of the CEA (French Alternative Energies and Atomic Energy Commission).

HPSF at SCA/HPCAsia: Strengthening the Open Source Ecosystem in Japan

January 29, 2026

Birds-of-a-Feather, SCA/HPCAsia 2026, Osaka, Japan

HPSF maintained a powerful presence throughout SCA/HPCAsia in Osaka this January. On January 28th, fellow governing board member Julien Bigot and I delivered a lightning talk at the Exhibitor Forum, highlighting the foundation’s mission to unify the software stack for the exascale era. This was supported by a dedicated HPSF booth on the exhibition floor, expertly managed by Chris Clark from the Linux Foundation with the help of numerous foundation partners. The week showcased the depth of the HPSF ecosystem, with well-attended tutorials for Kokkos, Spack, and OpenCHAMI proving the growing international demand for our projects. We capped off the conference on January 29th with a dedicated Birds of a Feather (BoF) session; following a presentation by Julien and myself, I joined a lively panel discussion moderated by Todd Gamblin (HPSF Governing Board Chair) to discuss the future of sustainable, open-source HPC software.

Kokkos Tutorial at SCA/HPCAsia – Osaka, Japan

January 26, 2026

Tutorial, SCA/HPCAsia 2026, Osaka, Japan

It was a pleasure to return to Japan and lead a well-attended, full-day Kokkos tutorial at SCA/HPCAsia in Osaka. Joined by Luc Berger-Vergiat from Sandia and team members from CEA France, Paul Zehner, Yuuichi Asahi, and Julien Bigot, we provided a deep dive into data parallelism, memory spaces, and the Kokkos::View abstractions essential for exascale performance. This engagement was particularly timely as the Japanese HPC community prepares for the transition to Fugaku-NEXT; we are eager to support researchers navigating the shift toward GPU-heavy architectures by ensuring their code remains performance-portable and future-proof.

From Kernels to Standards: How Kokkos and Modern C++ Future-Proof Critical Simulation Codes

January 07, 2026

Invited Talk, Advances in Applied Computer Science Invited Speaker Series, Los Alamos, New Mexico, USA

I was invited to present in the Advances in Applied Computer Science Invited Speaker Series at Los Alamos National Laboratory. In this seminar, I presented a vision for the future of high-performance scientific software, bridging the gap between hardware-specific kernels and international programming standards. I detailed how the Kokkos ecosystem enables performance portability across current exascale architectures (e.g., Frontier, Aurora, El Capitan) and explored the ongoing efforts to integrate these patterns directly into the ISO C++ Standard (C++23 and C++26). By championing features such as mdspan and standard linear algebra interfaces, we are creating a more resilient and sustainable software stack for the next generation of computational science.

Building the Kokkos Community Playbook: Our Journey with CSCCE Birdaro

December 18, 2025

Lightning Talk, Birdaro Training Program - Graduation Celebration, Oak Ridge, Tennessee, USA

Luc and I recently wrapped up our time in the inaugural Birdaro training program hosted by the CSCCE, and for our graduation, we got to share what we’ve been cooking up for the Kokkos Project.

C++26 Doing Even More for HPC

November 19, 2025

Panel, SC25, St. Louis, Missouri, USA

At SC26, I was invited to serve on the ISO C++ Standards Committee panel to discuss the next major standard, C++26. We covered new features most critical for HPC, including updates on SIMD, structured concurrency, linear algebra, and the general state of the C++ union for parallel programming.

Portable GPU Acceleration of HPC Applications with Standard C++

November 17, 2025

Tutorial, SC25, St. Louis, Missouri, USA

I helped lead the tutorial, Portable GPU Acceleration of HPC Applications with Standard C++. This session focused on leveraging ISO C++23 parallelism and concurrency features to portably accelerate HPC applications on heterogeneous systems (AMD, Intel, NVIDIA GPUs) without vendor-specific extensions. We provided hands-on experience covering classic HPC patterns like multi-dimensional loops, reductions, and overlapping MPI communication with GPU computation.

CSE-6230-A: High Performance Parallel Computing - Fall ’25

November 12, 2025

Graduate course, Georgia Tech, School of Computational Science and Engineering, Atlanta, Georgia, USA

I was honored to serve as a guest lecturer for the third time in Georgia Tech’s High Performance Parallel Computing graduate course (CSE-6230-A). I provided students with an introduction to Kokkos, demonstrating how this portability ecosystem enables single-source C++ code to run efficiently across highly diverse HPC architectures, including CPUs and GPUs.

Sustainable HPC Software: A Maintainer’s Perspective

October 15, 2025

Invited Talk, HPC Best Practices Webinars Series, Oak Ridge, Tennessee, USA

I recently had the honor of presenting an extended talk in the HPC Best Practices Webinar series, addressing the fundamental challenges of maintaining foundational scientific computing software for longevity.

Kokkos Tutorial at ICPP’s Inaugural HPSF Training

September 08, 2025

Tutorial, 54th International Conference on Parallel Processing, San Diego, California, USA

Christian and I were thrilled to present a two-day Kokkos lecture at the International Conference on Parallel Processing (ICPP) in San Diego. This was part of the inaugural HPSF training, which also featured sessions on Spack and Trilinos.

Sustaining the Future of HPC: The Role of the HPSF

July 10, 2025

Talk, ADAC Portability, Sustainability & Integration Seminar, Saclay, France

I recently had the pleasure of co-presenting a seminar titled “Sustaining the Future of HPC: The Role of the HPSF” at the Portability, Sustainability & Integration seminar series, a key initiative of the Accelerated Data Analytics and Computing (ADAC) Institute. I spoke alongside my colleague Julien Bigot from CEA in France. Julien and I both serve on the High Performance Software Foundation (HPSF) governing board, and our talk highlighted the HPSF’s crucial role in ensuring the longevity and effectiveness of High Performance Computing.

Panel Discussion: Kokkos - Reflecting on Exascale and Charting the Future

May 08, 2025

Panel, HPSF Conference 2025, Chicago, Illinois, USA

To conclude the 3rd KUG meeting, I moderated a dynamic panel session that brought together a diverse cross-section of the ecosystem—including core developers, library leads, application experts, and educators. The discussion served as a strategic reflection on the project’s journey through the dawn of the exascale era and since the last major release.

Kokkos User Group Meeting: Leadership Plenary & Technical Updates

May 07, 2025

User Group Meeting, HPSF Conference 2025, Chicago, Illinois, USA

The 3rd KUG meeting brought together approximately 70 practitioners and developers to discuss the evolution of the performance portability ecosystem. As part of the Kokkos leadership team, I coordinated the opening sessions to provide a comprehensive roadmap of the project’s technical and community growth.

Opening Plenary Session - Working Groups Introduction

May 05, 2025

Presentation, HPSF Conference 2025, Chicago, Illinois, USA

Delivered during the opening plenary of the inaugural HPSF Conference, this presentation served as a key status update from the Governing Board on the progress achieved since the foundation’s launch one year prior. I joined fellow board members to highlight the growth of our community-driven ecosystem and introduced the technical working groups designed to handle project cross-cutting activities. The talk provided attendees with the necessary roadmap to engage with specific breakout sessions, fostering the collaborative governance essential for long-term software sustainability in the HPC community.

Kokkos Best Practices: Integrating Kokkos into Your Project

March 19, 2025

Talk, CExA Kokkos Tea-Time, Saclay, France

I was pleased to present a session on “Kokkos Best Practices” as part of the CExA Kokkos Tea-Time talk series. This talk focused on practical strategies for effectively integrating Kokkos into projects using CMake. I discussed key considerations such as managing Kokkos through external installations versus in-project builds, and provided detailed guidance on the recommended initialization and finalization procedures for Kokkos within libraries and applications. This session aimed to equip developers with the tools and knowledge necessary to leverage Kokkos efficiently and effectively in their work.

Sustainable HPC Software: Lessons from the Trenches (A Maintainer’s Perspective)

March 19, 2025

Invited Talk, SOS27 Workshop, Engelberg, Switzerland

I was invited to present at the prestigious, invitation-only SOS27 workshop, themed “Fostering Innovation at Scale Beyond the Flops.” My presentation, “Sustainable HPC Software: Lessons from the Trenches (A Maintainer’s Perspective),” contributed to the session on “HPC Software Sustainability and Stewardship.” I shared firsthand experiences and insights gained from maintaining and leading the Kokkos project for over five years, addressing the critical challenges and solutions in ensuring the longevity and effectiveness of HPC software in today’s rapidly evolving landscape.

Kokkos in Japan: A Tutorial at Kyushu University

January 27, 2025

Tutorial, Research Institute for Information Technology, Kyushu University, Kyushu, Japan

Christian and I had the pleasure of presenting a one-day Kokkos tutorial at Kyushu University in Japan. The workshop was organized by the HPC OSS1 group of the PC Cluster Consortium (PCCC). You can find more details about the workshop on the PCCC website: https://www.pccluster.org/ja/event/2025/01/250127-hpc-oss-ws.html

  1. High-Performance Computing (HPC) Open-Source Software (OSS) ↩

PPPL Center for Advanced Computation Tutorials: A short Kokkos introduction

September 25, 2024

Invited Talk, Princeton Plasma Physics Laboratory (PPPL), Princeton, New Jersey, USA

I presented remotely a short introduction to Kokkos at PPPL’s Center for Advanced Computation Tutorials. PPPL is renowned for its work on XGC, a gyrokinetic particle-in-cell code crucial for simulating the edge region of magnetically confined thermonuclear fusion plasmas. XGC utilizes Kokkos and Cabana to achieve high performance on leadership-class supercomputers.

CASS BoF Days: Kokkos Ecosystem - State of the Union

July 12, 2024

BoF Session, Consortium for the Advancement of Scientific Software (CASS) first virtual Birds-of-a-Feather (BoF) days, Oak Ridge, Tennessee, USA

I organized and led a virtual Kokkos Birds-of-a-Feather session for CASS, the Consortium for the Advancement of Scientific Software.

Device Agnostic Programming Models Training Series - Kokkos

June 05, 2024

Tutorial, Training Event, National Computational Infrastructure, Canberra, Australia

I conducted Kokkos training for NCI (Australia), focusing on enabling performance portability across diverse hardware architectures through practical, hands-on experience.

C++ 23/26: What’s Next?

May 15, 2024

Panel, ISC High Performance 2024, Hamburg, Germany

At ISC 2024, I chaired the ‘C++ for HPC’ panel, which focused on the significant new features in C++23 and the ongoing development of C++26 for high-performance computing environments.

Welcome to C++ 23, the “pandemic” edition and C++ NEXT in 2026

November 15, 2023

Panel, SC23, Denver, Colorado, USA

At SC23, I was invited to join the ‘C++ 23, the “Pandemic” Edition and C++ NEXT in 2026’ panel, where we explored the significant features of C++23 and the roadmap for C++26, with a focus on its impact on HPC.

CExA Kokkos training days in Saclay, France

September 20, 2023

Multiday training event, Maison de la Simulation, CEA Paris-Saclay center, Saclay, France

Christian (@crtrott) and I were invited to CEA Saclay, France, for the CExA project kickoff, where we delivered a presentation and conducted a three-day training session to bootstrap the new Kokkos developer team and application representatives.

Kokkos case study: ArborX

May 30, 2023

Invited Talk, On the trail to exascale workshop, STFC Hartree Centre, Warrington, UK

I was invited to share my experience with Kokkos and its application in ArborX for performance portable geometric algorithms at the STFC Hartree Centre (UK), as one of a select group of US representatives.

Overcoming Today’s Limitations of Standard C++ with Kokkos

March 15, 2023

Invited Talk, SOS-25 Workshop, Lake Tahoe, CA, USA

I was invited speaker at SOS-25, a prestigious workshop on distributed supercomputing. I shared insights on how scientists are leveraging Kokkos to overcome the limitations of standard C++ and harness the power of modern supercomputers

CSE 6230: HPC Tools and Applications – Spring ’23

February 21, 2023

Graduate course, Georgia Tech, School of Computational Science and Engineering, Atlanta, Georgia, USA

I delivered a guest lecture on the Kokkos programming model for high-performance computing to students in Georgia Tech’s CSE 6230: HPC Tools and Applications during Spring 2023.

Paving the way to exascale for scientific applications

November 18, 2022

Invited Talk, SC22: 3rd Workshop on Hierarchical Parallelism for Exascale Computing (HiPar), Dallas, Texas, USA

I gave the opening keynote at the 2022 IEEE/ACM International Workshop on Hierarchical Parallelism for Exascale Computing, during SC22.

Kokkos tutorial at ATPESC 2022

August 04, 2022

Tutorial, Argonne Training Program on Extreme-Scale Computing (ATPESC), St. Charles, IL, USA

I was invited to present a Kokkos tutorial in the “Programming Models and Languages” track at the Argonne Training Program on Extreme-Scale Computing (ATPESC 2022). The tutorial was attended by over 70 participants and parked engaging questions and discussion, including a lively panel session. Recordings are available on YouTube: Part 1, Part 2, Pannel.