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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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#mpi

LingQi, the network........................................................................................................................................................................................................2026.11.07

Two planes, four rails, a four-level fat tree with one optical hop, 1.6 Tb/s per node, and what that means for a halo exchange.

Software, and making SME useful........................................................................................................................................................................................................2026.11.07

Kylin, Lclang, KML, Hyper MPI, UCX, and the tricks the first full-machine users needed: core partitioning, an async MPI runtime, SDMA pipelines.