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Phase 5 — trn2 rotation-block tuning for Jacobi sweeps #30

Description

@scttfrdmn

Roadmap phase tracker

This issue tracks trnsolver's work on Phase 5 of the trnsci roadmap.

See the suite-level roadmap
for the full phase matrix and cross-project dependencies. A reader-friendly
version lives at trnsci.dev/roadmap/.

What this phase means for trnsolver:
The rotation-block tile size for Jacobi is bounded by SBUF on
trn1; trn2's larger SBUF lets sweeps run with fewer round-trips
to HBM.

Done means:

  • trn2-tuned rotation-block tile parameters.
  • Runtime detection in the dispatch layer.
  • Benchmarks quantify the trn2 vs trn1 sweep-time improvement.

Coordination

  • Label: phase-5-generation — matches the same label in every sub-project.
  • Cross-project dependencies, if any, are called out in the "Done means"
    list above. Link any PRs / child issues here for tracking.

Close this issue when all "Done means" items are satisfied.

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