Anders Olsson d3cfee53a1 bench: capture T0 final numbers and post-mortem ...

Batch::iteration: 29.840 µs → 21.253 µs (1.40×)
Gaussian::mul:     1.568 ns →  218.69 ps (7.17×)
Gaussian::div:     1.572 ns →  218.64 ps (7.19×)

Gaussian arithmetic hit target (7×+ vs 1.5–2× expected). Batch::iteration
reached 1.40× vs the 3× target. Post-mortem: the bench exercises 100 tiny
2-team events and the dominant cost is still Vec allocation in within_priors,
sort_perm, and Game::likelihoods. The HashMap→Vec win shows at the History
level (forward/backward sweep) which this bench doesn't exercise.

Remediation plan documented in benches/baseline.txt: arena-ify sort_perm,
within_priors, and Game::likelihoods in T1 when Game's internals are
redesigned around the new factor graph.

38/38 tests passing. Closes T0 tier.

2026-04-24 07:28:28 +02:00

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