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runtime: avoid powf in the hotpath #49

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runtime: avoid powf in the hotpath #49

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5 changes: 4 additions & 1 deletion tokio/src/runtime/scheduler/multi_thread/stats.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -105,7 +105,10 @@ impl Stats {
let mean_poll_duration = elapsed / num_polls;

// Compute the alpha weighted by the number of tasks polled this batch.
let weighted_alpha = 1.0 - (1.0 - TASK_POLL_TIME_EWMA_ALPHA).powf(num_polls);
let mut weighted_alpha = TASK_POLL_TIME_EWMA_ALPHA * num_polls;
if weighted_alpha > 1.0 {
weighted_alpha = 1.0;
}

// Now compute the new weighted average task poll time.
self.task_poll_time_ewma = weighted_alpha * mean_poll_duration
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