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Take first task group for further execution #154419

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Take first task group for further execution #154419

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9 changes: 8 additions & 1 deletion compiler/rustc_data_structures/src/sync/parallel.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -145,7 +145,9 @@ fn par_slice<I: DynSend>(

const MAX_GROUP_COUNT: usize = 128;
let group_size = items.len().div_ceil(MAX_GROUP_COUNT);
let groups = items.chunks_mut(group_size);
let mut groups = items.chunks_mut(group_size);

let Some(first_group) = groups.next() else { return };

// Reverse the order of the later functions since Rayon executes them in reverse
// order when using a single thread. This ensures the execution order matches
Expand All @@ -159,6 +161,11 @@ fn par_slice<I: DynSend>(
}
});
}

// Run the first function without spawning to avoid overwhelming stealing.
for i in first_group.iter_mut() {
guard.run(|| for_each(i));
}
});
}

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