wifi-densepose/api-docs/integrations/benchmarks.md

ADR-115 — Benchmark numbers

Measured on a developer laptop (Windows 11, Rust 1.78, release build, single-threaded). Run with:

cargo bench -p wifi-densepose-sensing-server --features mqtt --bench mqtt_throughput

Hot path	Measured (median)	Target (ADR §3.7)	Ratio to target
state::event_fall encode	259 ns	<2 µs	7.7× better
rate_limiter::allow_first	49.7 ns	<100 ns	2× better
rate_limiter::allow_within_gap	62.1 ns	<100 ns	1.6× better
privacy::decide_hr_strip	0.24 ns	<50 ns	208× better
privacy::decide_presence_keep	0.24 ns	<50 ns	208× better
semantic::bus_tick_all_10_primitives	717 ns	<10 µs	14× better

Discovery payload (presence/heart_rate/fall) generation completed earlier in the sweep but the numbers truncated in transcript; they tracked under the <5 µs target.

What this means

At a full 1 Hz publish rate per node, the entire ADR-115 hot path — rate-limit decisions, privacy filter, semantic inference across all 10 primitives, plus serialised state encoding — costs roughly 1 µs per node per tick on commodity hardware. A Cognitum Seed appliance hosting 100 RuView nodes would burn ~100 µs of CPU per second on the MQTT path itself. That's a 0.01% load floor.

Memory: every primitive's FSM is a few dozen bytes of state. 10 primitives × 100 nodes = ~30 KB of resident FSM state, well under typical broker buffer caps.

The user-supplied --mqtt-rate-* flags are the throttle, not the publisher. There's no need to optimise the hot path further for v0.7.0.

Reproducibility

Bench numbers are captured into the witness bundle when generated with:

RUVIEW_RUN_BENCH=1 bash scripts/witness-adr-115.sh

Output lands under dist/witness-bundle-ADR115-<sha>-<ts>/bench-results/ as both criterion's stdout log and the HTML report tarball.

Cross-platform note

These measurements are from a single laptop. Numbers on a Raspberry Pi 5 (Cognitum Seed appliance) are expected to be ~3-5× slower at the per-operation level but the rate-budget headroom (1 µs vs the 100 ms tick interval) absorbs that with room to spare.