`cargo bench -p homecore --bench state_machine` covers:
- set/first_write — cold-path insert + alloc + broadcast
- set/warm_write_state_change — same-entity update fires broadcast
- set/noop_suppressed — same state+attrs, no broadcast (HA semantic)
- get/hit + get/miss — zero-copy Arc<State> read paths
- all_snapshot/{10,100,1000} — Vec<Arc<State>> snapshot for REST
- all_by_domain_light_20_of_100 — domain prefix filter
- broadcast_fan_out/{1,4,16,64} — 1 sender + N subscribers, async,
measures end-to-end deliver-and-recv latency
The broadcast fan-out is the most load-bearing measurement for
HOMECORE — every integration, the recorder, the automation engine,
and every WS subscriber holds a receiver, so the per-subscriber
delivery cost determines how many add-ons the runtime can host.
criterion 0.5 with sample_size=20 (fast tick, the fast-path benches
run in nanoseconds and don't need 100 samples).
Refs: docs/adr/ADR-127-homecore-state-machine-rust.md
Refs: #798
Co-Authored-By: claude-flow <ruv@ruv.net>
0c55498475