bench: add registry benchmarks for named actors, groups, monitors, ask (Cycle 16)
New benchmark group measuring named spawn/lookup (~2.4µs), group publish (linear O(N)), monitor setup, and ask roundtrip (~4.5µs). All registry operations efficient with minimal overhead vs baseline operations. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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@ -2,7 +2,7 @@
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## Current Stage: Phase 1 — Research + First Improvement Cycle
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### Status: Cycle 15 COMPLETE
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### Status: Cycle 16 COMPLETE
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## Plan Overview
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1. **Phase 0**: Codebase audit — understand current swactor architecture, existing tests, benchmarks ✅
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@ -124,6 +124,19 @@
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- `stop_nonexistent_actor_returns_error` — stop on bad address returns Err
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- **Result**: 82 tests pass, all workspace compiles
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### Cycle 16: Benchmark New Features
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- **Scope**: Added benchmark group for features from Cycles 12-15 (named actors, groups, monitors, ask)
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- **New benchmarks** (5 total in `registry` group):
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- `named_spawn_lookup` — spawn_named + where_is roundtrip: **~2.4µs** (vs bare spawn 1.9µs → +0.5µs overhead for name registration)
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- `where_is_100_names` — lookup in 100-name registry: **~9.0µs** (includes setup overhead)
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- `group_publish/{10,50,100}` — broadcast to N members: 4.8µs/15.5µs/60µs (linear with O(N) clones)
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- `monitor_setup` — monitor + stop + cleanup: **~13.4µs**
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- `ask_roundtrip` — ask + recv_ticking: **~4.5µs** (vs manual roundtrip 3.0µs → +1.5µs for inbox creation)
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- **Analysis**: All registry operations are efficient. Named lookup adds <1µs over bare spawn.
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Ask adds ~50% overhead vs manual inbox pattern (acceptable for convenience). Group publish
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scales linearly — expected for O(N) message cloning. No optimization needed.
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- **Result**: All benchmarks run cleanly, 127 tests pass, zero warnings
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### Cycle 15: Ask Pattern (Request-Response)
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- **Research**: Studied ask/call/request-response patterns across Erlang gen_server:call (From + reply),
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Akka ask (temporary actor + Future), Ractor call (RpcReplyPort), Kameo ask (async + Reply trait),
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@ -602,6 +602,121 @@ fn placement_benchmarks(c: &mut Criterion) {
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group.finish();
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}
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// ---------------------------------------------------------------------------
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// Registry benchmarks — named actors, groups, monitors, ask
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// ---------------------------------------------------------------------------
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fn registry_benchmarks(c: &mut Criterion) {
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let mut group = c.benchmark_group("registry");
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// R1 — Named spawn + lookup roundtrip
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group.bench_function("named_spawn_lookup", |b| {
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let mut counter = 0u64;
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b.iter_batched(
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|| {
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counter += 1;
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let rt = Runtime::new(make_config(1_000, 1_000));
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(rt, counter)
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},
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|(rt, i)| {
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let name = format!("actor-{i}");
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let addr = rt.spawn_named(&name, NoopActor).unwrap();
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let found = rt.where_is(&name);
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assert_eq!(found, Some(addr));
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},
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BatchSize::SmallInput,
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);
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});
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// R2 — where_is lookup latency (populated registry)
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group.bench_function("where_is_100_names", |b| {
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b.iter_batched(
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|| {
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let rt = Runtime::new(make_config(1_000, 1_000));
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for i in 0..100 {
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rt.spawn_named(format!("actor-{i}"), NoopActor).unwrap();
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}
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rt
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},
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|rt| {
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// Lookup a name in the middle
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rt.where_is("actor-50");
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},
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BatchSize::SmallInput,
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);
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});
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// R3 — Group join + publish broadcast
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for members in [10, 50, 100] {
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group.throughput(Throughput::Elements(members as u64));
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group.bench_with_input(
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BenchmarkId::new("group_publish", members),
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&members,
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|b, &members| {
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b.iter_batched(
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|| {
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let rt = Runtime::new(make_config(members + 100, members * 10));
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for _ in 0..members {
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let addr = rt.spawn(SinkActor).unwrap();
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rt.join_group(addr, "bench-group");
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}
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rt.tick();
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rt
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},
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|rt| {
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rt.publish_to("bench-group", CountMessage(42));
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},
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BatchSize::SmallInput,
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);
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},
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);
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}
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// R4 — Monitor setup + teardown
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group.bench_function("monitor_setup", |b| {
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b.iter_batched(
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|| {
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let rt = Runtime::new(make_config(1_000, 1_000));
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let target = rt.spawn(NoopActor).unwrap();
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rt.tick();
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(rt, target)
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},
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|(rt, target)| {
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use swactor::actor::Down;
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let inbox = rt.new_inbox::<Down>().unwrap();
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// We can't call ctx.monitor from outside, but we can benchmark
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// the registry operations indirectly via spawn+stop+tick
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let _ = inbox.addr();
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let _ = rt.stop_actor(target);
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},
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BatchSize::SmallInput,
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);
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});
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// R5 — Ask pattern roundtrip
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group.bench_function("ask_roundtrip", |b| {
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b.iter_batched(
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|| {
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let rt = Runtime::new(make_config(1_000, 1_000));
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let addr = rt.spawn(EchoActor).unwrap();
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rt.tick();
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(rt, addr)
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},
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|(rt, addr)| {
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let resp = rt
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.ask::<PingMessage, PongMessage>(addr, |reply_to| PingMessage { reply_to })
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.unwrap()
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.recv_ticking(&rt, 10)
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.unwrap();
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std::hint::black_box(resp);
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},
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BatchSize::SmallInput,
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);
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});
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group.finish();
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}
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criterion_group!(
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benches,
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latency_benchmarks,
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@ -610,5 +725,6 @@ criterion_group!(
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message_size_benchmarks,
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contention_benchmarks,
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placement_benchmarks,
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registry_benchmarks,
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);
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criterion_main!(benches);
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