Live step-shape census on frank-archon (radiance 1.0.13, boot of 2026-10-15):
decode-only steps run 18.7 ms, prefill+mixed steps 317 ms — 60 % of engine
wall-clock inside 8 % of the steps — and a day of Prometheus shows decode at
13.3 t/s median while prefill runs >=1000 t/s against 106-240 t/s when it does
not. The lag test says the penalty is confined to the prefill window: no
lingering expert-residency tail, and preemptions are zero.
Adds the method as LLM Performance Diagnosis S9 (counter arithmetic, the lagged
bucket correlation that separates step contention from residency churn, and the
four radiance knobs with their published costs), and the endpoint's own numbers
plus the verdict as two frank-archon laws: --busy-prefill-chunk and
--prefill-interleave are absent from this pin (proven via the running
container's --help), so MNBT is the only crank here and an image bump is gated
by the 1.2.0 numerics dead end.
No behavior change; docs only.
Frank
e3a02e25c7