The first real boot gave the chance to measure what warming actually buys, and
the trial's numbers were wrong:
- Empty registry, register only, then time: the FIRST synthesis of a freshly
registered voice cost 1 883 ms; the next two 1 283 and 1 226 ms. A ~110-word
request cost 9.4 s and then 9.8 s.
- So the published 6.2–8.0 s cold / first-audio-byte 5 530 ms / later-requests
0.5 ms ladder does not reproduce, and request time tracks the audio generated
rather than snapshot state. The 0.5 ms figure is an internal state-restore
cost, never an end-to-end request time.
- Warming still earns its place for a different reason than the page claimed:
the registry is memory-only and re-registering does not warm, so a boot without
the hook leaves the façade answering 400 for every name. The saving is ~0.6 s.
Law 1 of [[Frank TTS Engine]] is re-titled the registry law and carries the
measured numbers; its example journal line is a real one from today; the
troubleshooting row for "first request of the day is slow" — the retired law's
symptom — is replaced by the argument-cap fault that actually happened. The same
ladder in the research brief is annotated rather than erased, and [[Voice Packs]]
step 6 stops claiming the hook registers only packs it has not seen (the engine
replaces a name it already holds).
The deploy of the newly built engine image came back `0 voice(s) warm` with
`/app/warm-voices.sh: line 152: /usr/bin/curl: Argument list too long` above
every line, and the unit was `active` with a green `/health` beside it. The hook
built `{"name":…,"wav_b64":…}` in a shell variable and passed it as ONE curl
argument; the kernel caps a single argument at MAX_ARG_STRLEN = 131,072 bytes,
and the shipped reference clips base64 to about 1.27 MB, so curl was never
executed and the hook reported the absence as "HTTP no response".
The body now goes to a mktemp file and curl reads `@file`; the audio enters
through a redirection instead of a command substitution, so the script never
holds a 1.3 MB string at all. Every pack in the fleet is ~1 MB, i.e. ~13x the
cliff, so this was always going to happen — it took the first real packs to show
it because no fixture was ever that big.
The regression test therefore ships a 300 KB pack against the seam's REAL stub
listener with the REAL curl: it fails with the same kernel error the host did
(`Argument list too long`, then the 400-for-every-name summary), and passes once
the body is a file. Proved red before the fix, green after.
Frank