Write-ups on high-performance computing, GPU computing, infrastructure, and the projects behind them, by Ethan Puyaubreau.https://kerboul.me/https://kerboul.me/blog/ultron-debian-nvidiahttps://kerboul.me/blog/ultron-debian-nvidiaUltron was a Proxmox node. I wiped it for bare Debian 13 so the GPU would answer to one machine instead of a hypervisor, then spent the evening in the NVIDIA driver gauntlet Trixie hands you. The part that bit me was Secure Boot.Thu, 18 Jun 2026 00:00:00 GMThttps://kerboul.me/blog/sentinel-status-pagehttps://kerboul.me/blog/sentinel-status-pageSENTINEL is my homelab status page, and it ships zero JavaScript. Health is collected out of band, baked into static HTML every minute, and served from K3s. A status page should be the one page that still loads when everything else is broken.Mon, 15 Jun 2026 00:00:00 GMThttps://kerboul.me/blog/kokkos-gpu-energyhttps://kerboul.me/blog/kokkos-gpu-energyA profiler tells you where a GPU kernel 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, with NVML for the precise per-GPU number and Variorum for the whole node.Fri, 12 Jun 2026 00:00:00 GMThttps://kerboul.me/blog/nbody-webgpuhttps://kerboul.me/blog/nbody-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.Tue, 09 Jun 2026 00:00:00 GMT