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fix recycler free stat report (#23159)

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* fix recycler free stat report

* update comments for ewma window size

* one atomic update with aggregated local counter

* fix clippy integer arithmetic error

* move free calcs outside of loop

* fix integer arithmetic error
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HaoranYi 2022-03-03 17:08:59 -06:00 committed by GitHub
parent afda8c4020
commit aad73f1f2e
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1 changed files with 12 additions and 3 deletions
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15
perf/src/recycler.rs
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@ -14,14 +14,19 @@ use {
// cushion against *normal* variations in the workload while bounding the
// number of redundant garbage collected objects after temporary bursts.
const RECYCLER_SHRINK_SIZE: usize = 1024;
// Lookback window for averaging number of garbage collected objects in terms
// of number of allocations.
// Lookback window for exponential moving averaging number of garbage collected
// objects in terms of number of allocations. The half-life of the decaying
// factor based on the window size defined below is 11356. This means a sample
// of gc.size() that is 11356 allocations ago has half of the weight as the most
// recent sample of gc.size() at current allocation.
const RECYCLER_SHRINK_WINDOW: usize = 16384;
#[derive(Debug, Default)]
struct RecyclerStats {
total: AtomicUsize,
reuse: AtomicUsize,
freed: AtomicUsize,
max_gc: AtomicUsize,
}
@ -148,6 +153,10 @@ impl<T: Default + Reset> RecyclerX<T> {
if gc.len() > RECYCLER_SHRINK_SIZE
&& self.size_factor.load(Ordering::Acquire) >= SIZE_FACTOR_AFTER_SHRINK
{
self.stats.freed.fetch_add(
gc.len().saturating_sub(RECYCLER_SHRINK_SIZE),
Ordering::Relaxed,
);
for mut x in gc.drain(RECYCLER_SHRINK_SIZE..) {
x.set_recycler(Weak::default());
}
@ -169,7 +178,7 @@ impl<T: Default + Reset> RecyclerX<T> {
}
let total = self.stats.total.load(Ordering::Relaxed);
let reuse = self.stats.reuse.load(Ordering::Relaxed);
let freed = self.stats.total.fetch_add(1, Ordering::Relaxed);
let freed = self.stats.freed.load(Ordering::Relaxed);
datapoint_debug!(
"recycler",
("gc_len", len as i64, i64),