swactor

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Author	SHA1	Message	Date
Developer	acacc1b758	feat: thread parking for instant worker wakeup Replace thread::sleep with thread::park_timeout in worker backoff loop. Workers register their thread handle via OnceLock<Thread> on startup. When send_to or spawn routes work to a worker, Thread::unpark() wakes it instantly instead of waiting for the sleep timer to expire. Inspired by tokio's parker state machine and Linux NO_HZ adaptive ticks. Implementation: - Runtime stores Vec<OnceLock<Thread>> for worker thread handles - Workers call OnceLock::set(thread::current()) on startup - Runtime::send_any, spawn_any, and WorkerContext cross-worker sends call notify_worker() → Thread::unpark() on the target worker - TickContext carries worker_threads reference for cross-worker notification - Zero new dependencies (std::sync::OnceLock + std:🧵:park_timeout) Benefits: - Parked workers wake instantly when work arrives (vs up to 1ms sleep delay) - No overhead on hot path — unpark() is no-op if thread isn't parked - Single-threaded tick() mode unaffected (OnceLock never set) All 58 tests pass (52 runtime_api + 5 transport + 1 doctest). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>	2026-02-12 11:31:34 +00:00
Developer	10cb0780b7	feat: stress tests, expanded benchmarks, and research extension Cycle 2 of the competitor analysis improvement loop. Research additions: - Kameo: async on tokio, dual bounded/unbounded mailbox (default 64), Erlang-style supervision links, vtable dispatch - Actix: custom Vyukov lock-free MPSC queue (why it's fastest), 256-message assertion guard (validates our budget), Context-as-Future New stress tests (6): - Message ordering preserved under small budget (budget=8) - Multi-threaded: 50 senders × 100 msgs to one receiver (4 threads) - Concurrent spawn+send of 200 actors (4 threads) - 50-level chain spawning across 2 workers - Panic isolation: 10 panicking + 10 healthy actors (4 threads) - Sustained throughput: 10 batches of 100 msgs with interleaved ticks New benchmark groups: - msg_size: throughput and send_latency by message size (8B-4KB) - contention: fanin (1-100 senders), cross_worker (1-4 threads) All 57 tests pass (51 runtime_api + 5 transport + 1 doctest). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>	2026-02-12 11:24:33 +00:00
Developer	ef87f7e1b9	feat: per-actor message budget for tick fairness Research across ractor, tokio, Erlang/OTP BEAM, Linux CFS, and libuv revealed that tick_all drained the entire mailbox per actor per tick, allowing one hot actor to starve all others on the same worker. - Add `actor_message_budget` to RuntimeConfig (default: 64 msgs/actor/tick) - Modify tick_all to break after budget messages, yielding to next actor - budget=0 restores unlimited (backward compatible) behavior - 3 new fairness tests validating hot-cold actor scenarios - New fairness benchmark group (cold_latency_under_pressure, throughput_by_budget) - Fix RuntimeConfig struct literals across workspace crates Inspired by BEAM's 4000-reduction budget and tokio's 128-op cooperative budget. All 45 tests pass (42 original + 3 new). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>	2026-02-12 11:11:30 +00:00

Author

SHA1

Message

Date

Developer

acacc1b758

feat: thread parking for instant worker wakeup

Replace thread::sleep with thread::park_timeout in worker backoff loop.
Workers register their thread handle via OnceLock<Thread> on startup.
When send_to or spawn routes work to a worker, Thread::unpark() wakes
it instantly instead of waiting for the sleep timer to expire.

Inspired by tokio's parker state machine and Linux NO_HZ adaptive ticks.

Implementation:
- Runtime stores Vec<OnceLock<Thread>> for worker thread handles
- Workers call OnceLock::set(thread::current()) on startup
- Runtime::send_any, spawn_any, and WorkerContext cross-worker sends
  call notify_worker() → Thread::unpark() on the target worker
- TickContext carries worker_threads reference for cross-worker notification
- Zero new dependencies (std::sync::OnceLock + std:🧵:park_timeout)

Benefits:
- Parked workers wake instantly when work arrives (vs up to 1ms sleep delay)
- No overhead on hot path — unpark() is no-op if thread isn't parked
- Single-threaded tick() mode unaffected (OnceLock never set)

All 58 tests pass (52 runtime_api + 5 transport + 1 doctest).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-12 11:31:34 +00:00

Developer

10cb0780b7

feat: stress tests, expanded benchmarks, and research extension

Cycle 2 of the competitor analysis improvement loop.

Research additions:
- Kameo: async on tokio, dual bounded/unbounded mailbox (default 64),
  Erlang-style supervision links, vtable dispatch
- Actix: custom Vyukov lock-free MPSC queue (why it's fastest),
  256-message assertion guard (validates our budget), Context-as-Future

New stress tests (6):
- Message ordering preserved under small budget (budget=8)
- Multi-threaded: 50 senders × 100 msgs to one receiver (4 threads)
- Concurrent spawn+send of 200 actors (4 threads)
- 50-level chain spawning across 2 workers
- Panic isolation: 10 panicking + 10 healthy actors (4 threads)
- Sustained throughput: 10 batches of 100 msgs with interleaved ticks

New benchmark groups:
- msg_size: throughput and send_latency by message size (8B-4KB)
- contention: fanin (1-100 senders), cross_worker (1-4 threads)

All 57 tests pass (51 runtime_api + 5 transport + 1 doctest).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-12 11:24:33 +00:00

Developer

ef87f7e1b9

feat: per-actor message budget for tick fairness

Research across ractor, tokio, Erlang/OTP BEAM, Linux CFS, and libuv
revealed that tick_all drained the entire mailbox per actor per tick,
allowing one hot actor to starve all others on the same worker.

- Add `actor_message_budget` to RuntimeConfig (default: 64 msgs/actor/tick)
- Modify tick_all to break after budget messages, yielding to next actor
- budget=0 restores unlimited (backward compatible) behavior
- 3 new fairness tests validating hot-cold actor scenarios
- New fairness benchmark group (cold_latency_under_pressure, throughput_by_budget)
- Fix RuntimeConfig struct literals across workspace crates

Inspired by BEAM's 4000-reduction budget and tokio's 128-op cooperative budget.
All 45 tests pass (42 original + 3 new).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-12 11:11:30 +00:00

3 commits