Implementation of SDD-120 §1-§8:
Bench harness (crates/chanora_audio/benches/):
- common.rs: deterministic synthetic audio (440 Hz sine, no RNG).
- realtime_capture.rs: bench_capture_alloc_count (dhat) +
bench_capture_callback_wall_clock (criterion).
- opus_codec.rs: bench_opus_encode_latency + bench_opus_decode_latency
(direct audiopus, not AudioHandler — SDD-120 §3 item 4).
- resampler.rs: bench_resampler_throughput across 44.1->48 /
16->48 / 48->48 passthrough.
CI tooling (crates/chanora_audio/examples/):
- emit_baseline.rs: aggregates criterion estimates.json outputs
into the SRS-217 baseline schema.
- compare_baseline.rs: applies SRS-219 tolerance, renders markdown
table with 🟢/🟡/🔴 markers + yellow simpler-form realization per
SDD-120 §8.
Deviation from SDD-120 §2 / §5 / §7 placement: these tools live
under examples/, not benches/ or src/bin/. Rationale: they must
consume serde_json (a dev-only dep — production builds must not
pull it). Cargo only resolves dev-dependencies for [[test]],
[[bench]], and [[example]] targets; [[bin]] targets under
src/bin/ see only regular [dependencies]. examples/ keeps the
binaries out of the production dep tree while still giving them
cargo run --example invocation. An SDD-120 amendment should
reflect this.
Workflows (.github/workflows/):
- bench-advisory.yml: PR + push triggers; runs benches; posts a
sticky PR comment via actions/github-script@v7; job status is
always success (SRS-218 clause 4 — non-blocking).
- bench-baseline-update.yml: workflow_dispatch only; runs benches;
opens PR via peter-evans/create-pull-request@v6 (sole writer of
the SAD-089 baseline JSON).
Cargo.toml additions ([dev-dependencies] only — verified excluded
from --release builds): criterion 0.5, dhat 0.3, serde_json 1.
Source-code seam: minimal pub-but-#[doc(hidden)] bench_seam module
in chanora_audio (engine.rs + lib.rs re-export) so the criterion
bench harness can construct a CaptureState and drive
CaptureState::ingest without re-implementing the engine (SDD-120
§3). Non-iOS targets only — CaptureState itself is iOS-gated.
Initial baseline seed: crates/chanora_audio/benches/baselines/
x86_64-unknown-linux-gnu.json = {}. compare_baseline handles the
missing-baseline case gracefully and emits a 'no red markers'
report; the first manual dispatch of bench-baseline-update.yml
after merge establishes the real values.
Out of scope per SDD-120 §10: production telemetry export,
build-failing hard CI gate, multi-host benchmarking, IDE
integration, Dart-side bridge round-trip bench.
Verification:
- cargo check --workspace --all-targets: PASS.
- cargo bench --bench realtime_capture --no-run: PASS.
- cargo bench --bench opus_codec --no-run: PASS.
- cargo bench --bench resampler --no-run: PASS.
- cargo build --example emit_baseline --example compare_baseline
-p chanora_audio: PASS.
- cargo test --workspace: 106 passed, 0 failed, 3 ignored — no
regression from prior count.
EdisonJwa
7188a5a69d