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hpcnotes

Short notes on high-performance computing, and personal thoughts around HPC.

Notes

HPC........................................................................................................................................................................................................2026.09.11

A nested performance-engineering note: sections, sub-notes, and sub-sub-notes, walked in order.

Working on a shared cluster........................................................................................................................................................................................................2026.09.08

Login, modules, a job that finishes, then a first GPU kernel. One note, four pages.

Thoughts

What a note can carry........................................................................................................................................................................................................2026.09.02

Code, diagrams, maths, figures, gifs. Write the note as a Markdown file; the site renders the rest.

Why site-independent HPC notes still matter........................................................................................................................................................................................................2026.08.24

Every centre has a hostname. None of them should have to re-explain MPI ranks from scratch.

Measure before you optimise........................................................................................................................................................................................................2026.07.28

A CFD mini-app that was 'MPI bound' until we turned the VTK dumps off. Performance engineering as a habit, not a rewrite.