Writing
Write-ups on HPC, GPU computing, infrastructure, and the projects behind them.
- Jun 18, 2026Tearing the GPU node down from Proxmox to bare DebianThe GPU node ran Proxmox. I wiped it for bare Debian 13 so the GPU would sit directly under the host kernel, then spent the evening in the NVIDIA driver gauntlet Trixie hands you. The part that caught me was Secure Boot. (It has since gone back to Proxmox.)
- Jun 12, 2026Charging GPU energy to the code that spent itA profiler tells you where GPU code spends time. I wanted to know where it spends joules, so I built a Kokkos Tools connector that samples power on a side thread and integrates it over each profiled region. On ArborX DBSCAN, the faster implementation saves more energy than time: 19% less time, 25% less energy.
- Jun 9, 2026A galaxy in a browser tab, computed on your GPU with WebGPUA real-time gravitational N-body galaxy, a brute-force O(N²) sum recomputed every frame in a WebGPU compute shader. 65k bodies, no server, no precompute.
Questions, corrections, or work: ethan.puyaubreau@gmail.com