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Improve cooperation from from_iterator to prevent task starvation
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1 changed files with 12 additions and 0 deletions
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@ -76,10 +76,22 @@ where
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streem::from_fn(|yielder| async move {
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streem::from_fn(|yielder| async move {
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let mut stream = rx.into_stream().into_streamer();
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let mut stream = rx.into_stream().into_streamer();
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let yield_count = buffer.max(8);
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let mut count = 0;
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while let Some(res) = stream.next().await {
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while let Some(res) = stream.next().await {
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tracing::trace!("from_iterator: looping");
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tracing::trace!("from_iterator: looping");
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count += 1;
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count = count % yield_count;
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yielder.yield_(res).await;
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yielder.yield_(res).await;
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// every 8 (or buffer-size) items, yield to executor before looping
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// improves cooperation
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if count == 0 {
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tokio::task::yield_now().await;
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}
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}
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}
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let _ = handle.await;
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let _ = handle.await;
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