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Improve cancel speed for large matches

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This commit is contained in:
Pascal Kuthe 2023-08-03 02:29:13 +02:00
parent 4f59b0fb91
commit 7a432aa051
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GPG Key ID: D715E8655AE166A6
1 changed files with 24 additions and 8 deletions
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32
src/worker.rs
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@ -1,5 +1,6 @@
use std::cell::UnsafeCell;
use std::sync::atomic::{self, AtomicBool};
use std::mem::take;
use std::sync::atomic::{self, AtomicBool, AtomicU32};
use std::sync::Arc;
use nucleo_matcher::MatcherConfig;
@ -34,6 +35,7 @@ pub(crate) struct Woker<T: Sync + Send + 'static> {
notify: Arc<(dyn Fn() + Sync + Send)>,
pub(crate) items: Arc<boxcar::Vec<T>>,
in_flight: Vec<u32>,
unmatched: AtomicU32,
}
impl<T: Sync + Send + 'static> Woker<T> {
@ -75,6 +77,7 @@ impl<T: Sync + Send + 'static> Woker<T> {
notify,
items: Arc::new(boxcar::Vec::with_capacity(2 * 1024, cols)),
in_flight: Vec::with_capacity(64),
unmatched: AtomicU32::new(0),
};
(pool, worker)
}
@ -148,11 +151,13 @@ impl<T: Sync + Send + 'static> Woker<T> {
if cleared {
self.last_snapshot = 0;
*self.unmatched.get_mut() = 0;
self.matches.clear();
}
// TODO: be smarter around reusing past results for rescoring
let empty_pattern = self.pattern.cols.iter().all(|pat| pat.is_empty());
if empty_pattern {
if self.pattern.cols.iter().all(|pat| pat.is_empty()) {
*self.unmatched.get_mut() = 0;
self.matches.clear();
self.matches
.extend((0..self.last_snapshot).map(|idx| Match { score: 0, idx }));
@ -180,14 +185,19 @@ impl<T: Sync + Send + 'static> Woker<T> {
.par_iter_mut()
.take_any_while(|_| !self.canceled.load(atomic::Ordering::Relaxed))
.for_each(|match_| {
if match_.idx == u32::MAX {
return;
}
// safety: in-flight items are never added to the matches
let item = self.items.get_unchecked(match_.idx);
match_.score = pattern
.score(item.matcher_columns, matchers.get())
.unwrap_or(u32::MAX);
if let Some(score) = pattern.score(item.matcher_columns, matchers.get()) {
match_.score = score;
} else {
self.unmatched.fetch_add(1, atomic::Ordering::Release);
match_.score = 0;
match_.idx = u32::MAX;
}
});
// TODO: do this in parallel?
self.matches.retain(|m| m.score != u32::MAX);
}
if self.canceled.load(atomic::Ordering::Relaxed) {
@ -196,6 +206,9 @@ impl<T: Sync + Send + 'static> Woker<T> {
// TODO: cancel sort in progress?
self.matches.par_sort_unstable_by(|match1, match2| {
match2.score.cmp(&match1.score).then_with(|| {
if match1.idx == u32::MAX || match2.idx == u32::MAX {
return match1.idx.cmp(&match2.idx);
}
// the tie breaker is comparitevly rarely needed so we keep it
// in a branch especially because we need to access the items
// array here which involves some pointer chasing
@ -214,6 +227,9 @@ impl<T: Sync + Send + 'static> Woker<T> {
(len1, match1.idx).cmp(&(len2, match2.idx))
})
});
// let old = self.matches.clone();
self.matches
.truncate(self.matches.len() - take(self.unmatched.get_mut()) as usize);
}
if self.should_notify.load(atomic::Ordering::Acquire) {