Add ResizableSemaphore for adaptive pipeline concurrency (#1389)#1389
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Add ResizableSemaphore for adaptive pipeline concurrency (#1389)#1389justinvjoseph wants to merge 1 commit into
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…earch#1389) Summary: Add `ResizableSemaphore` — an asyncio-compatible semaphore whose max permit count can be adjusted at runtime. This is the foundational primitive for dynamic concurrency control in SPDL pipelines. Key features: - `resize(new_max)` adjusts permits at runtime; resize-up wakes blocked waiters immediately, resize-down drains gracefully (no preemption) - `acquire()`/`release()` semantics match `asyncio.Semaphore` - `max_value` and `active` properties for observability - Thread-safe within asyncio's single-threaded model - Comprehensive error handling for invalid values This is Diff 1 of a 5-diff series implementing a unified adaptive scheduler for SPDL pipelines (T262755626). Differential Revision: D99920401
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Summary:
Add
ResizableSemaphore— an asyncio-compatible semaphore whose max permit count can be adjusted at runtime. This is the foundational primitive for dynamic concurrency control in SPDL pipelines.Key features:
resize(new_max)adjusts permits at runtime; resize-up wakes blocked waiters immediately, resize-down drains gracefully (no preemption)acquire()/release()semantics matchasyncio.Semaphoremax_valueandactiveproperties for observabilityThis is Diff 1 of a 5-diff series implementing a unified adaptive scheduler for SPDL pipelines (T262755626).
Differential Revision: D99920401