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In-process TTS was chosen to remove a ~50-100ms HTTP roundtrip per chunk.
That holds on a many-core dev machine and inverts completely under the
deployment's CPU quota. Measured in the pod, same sentence, same model:
in-process (kokoro q4) first frame 7809 ms
speaches (HTTP) first frame 1414 ms cold, 622 ms warm
The pod gets a 2-core quota while os.cpus() reports the host's 20, so ONNX
sized its pools for 20 and ran 26 threads into ~50% scheduler throttling
(cpu.stat: nr_throttled 1841 / nr_periods 3702). There is no knob to fix
it from here: OMP_NUM_THREADS and ORT_INTRA_OP_NUM_THREADS had no effect,
and kokoro-js forwards only {dtype, device, progress_callback}, so
session_options can't reach onnxruntime. Both adapters also returned
total ≈ first frame, so the sub-sentence streaming the in-process path was
supposed to buy never materialised.
Moving synthesis out of the job process also removes the ONNX-vs-FFI
contention that corrupted the room handle on connect, and takes phonemizer
out of the dependency tree — the Emscripten handler hijack that turned
every async failure into a bare exit code 7.
- worker.ts constructs Tts (speaches) instead of LocalTts; no preload, so
ttsReady and its retain() are gone
- delete audio.tts.local.ts and tts.local.smoke.ts; drop kokoro-js and
@huggingface/transformers from packages/voice
- TTS_BASE_URL / TTS_API_KEY / TTS_MODEL are required config again;
TTS_MODEL_ID / TTS_DTYPE / HF_CACHE_DIR are gone, including from the
Dockerfile
- installCrashDiagnostics() and retain() stay, with their comments
rewritten: they no longer claim a dependency that isn't there. The
exit-7 hazard is now history rather than a live condition, but Node
still kills the process on an unhandled rejection and the next native
dep can hijack the handlers again.
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