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Empirical proof of MR-686's central design promise: per-actor
admission control isolates noisy actors from light traffic. The
existing bench_concurrent_http harness measures aggregate throughput;
this harness measures the latency tail seen by light actors while a
heavy actor saturates its own per-actor cap.
Setup: one "heavy" actor flooding /ingest with multi-row NDJSON
batches; N "light" actors each running short bursts of /change
inserts, each authenticating with a distinct bearer token so the
WorkloadController accounts them as separate identities.
Output: heavy throughput / 429 count, light p50/p95/p99/max latency.
Acceptance heuristic on local FS: light-actor p99 < 2 s while the
heavy actor saturates its own cap.
Sample run on local FS, cap=1, 4 light actors x 30 ops, 20 heavy
batches x 50 rows: light p99 = 710 ms, light errors = 0 (well under
the 2 s acceptance target). The test demonstrates the isolation
property — the heavy /ingest holds its own admission slot but
doesn't affect light actors since they have separate per-actor
state.
Usage:
cargo run --release -p omnigraph-server --example bench_actor_isolation -- \
--light-actors 4 --light-ops-per-actor 30 \
--heavy-batches 20 --heavy-rows-per-batch 50 \
--inflight-cap 1 \
--output .context/bench-results/after-pr2-phase2/actor-isolation.json
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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