feat(runtime): add autoscaler for automatic worker thread scaling#29
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feat(runtime): add autoscaler for automatic worker thread scaling#29
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Implement two new synchronization primitives: - spinlock: TTAS (Test-and-Test-and-Set) algorithm with CPU pause instructions for efficient spinning. Includes spinlock_guard with RAII, move semantics, and manual unlock support. - condition_variable: Coroutine-aware condition variable that suspends instead of blocking. Supports three usage modes: - With mutex (double co_await pattern for async re-lock) - With spinlock/lockable (single co_await, sync re-lock) - Unlocked mode for single-worker-thread scenarios Provides notify_one() and notify_all() via scheduler handle rescheduling. Includes comprehensive tests (12 test cases) covering basic operations, coroutine integration, RAII guards, move semantics, producer-consumer patterns, and notify_one/notify_all semantics. All tests pass under ASAN and TSAN with no warnings. Updates wiki documentation (API-Reference.md, Core-Concepts.md) with full API signatures, usage examples, and design guidance.
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Add autoscaler component that automatically adjusts worker thread count based on load. Includes: - autoscaler_config: Configurable thresholds for scaling decisions - autoscaler_triggers: Template-based trigger types (on_overload, on_idle, on_block) - autoscaler_actions: Action types and combinators (scale_up, scale_down, log, null) - autoscaler_impl: Main autoscaler with default trigger behavior Features: - Automatic scale-up when pending tasks exceed overload threshold - Automatic scale-down when queue is idle for configured delay - Block detection for workers stuck in user code - Template-based trigger-action system for extensibility - Default behavior works without custom triggers Add worker metrics tracking (last_task_time, is_idle) to support autoscaler block detection. Update examples, documentation, and tests.
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Summary
Test Plan