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Notes

LineShine, an exaflop without GPUs
Working on a shared cluster

Thoughts

What a note can carry

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hpcnotes: HPC notes and wiki

Notes on high-performance computing.Short and practical: CPU caches, SIMD, MPI, GPUs, Slurm clusters.

Notes

LineShine, an exaflop without GPUs........................................................................................................................................................................................................2026.11.07

The June 2026 TOP500 number one, taken apart: the LX2 chip, its matrix units, two memory tiers, the LingQi network, the software, and what the benchmarks really say.

The LX2 core, and 128 flops a cycle........................................................................................................................................................................................................1

Memory, two tiers and sixteen NUMA domains........................................................................................................................................................................................................2

From node to machine room........................................................................................................................................................................................................3

LingQi, the network........................................................................................................................................................................................................4

Software, and making SME useful........................................................................................................................................................................................................5

Benchmarks, beyond HPL........................................................................................................................................................................................................6

What runs on it........................................................................................................................................................................................................7

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

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

Login nodes are not compute........................................................................................................................................................................................................1

Environment modules are a contract........................................................................................................................................................................................................2

Anatomy of a Slurm job that actually finishes........................................................................................................................................................................................................3

From login node to first GPU kernel........................................................................................................................................................................................................4

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.