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rt: reduce the impact of CPU bound tasks on the overall runtime shceduler #6251

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rt: reduce the impact of CPU bound tasks on the overall runtime shceduler #6251

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7 changes: 7 additions & 0 deletions tokio/src/runtime/scheduler/multi_thread/worker.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -917,6 +917,13 @@ impl Core {
.shared
.idle
.unpark_worker_by_id(&worker.handle.shared, worker.index);

// Since this worker is awakened with tasks, it cannot be responsible for
// polling the driver for a certain period of time.
// Therefore, we ensure that at least one worker is designated to poll the driver here.
// This is for avoid significant delays in driver event processing,
// as discussed in https://github.com/tokio-rs/tokio/issues/4730.
worker.handle.notify_parked_local();
return true;
}

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