AcctIdx: flush inserts to disk (#20074)
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@ -22,10 +22,14 @@ pub struct BucketMapHolderStats {
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pub inserts: AtomicU64,
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pub count_in_mem: AtomicU64,
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pub per_bucket_count: Vec<AtomicU64>,
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pub flush_entries_updated_on_disk: AtomicU64,
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pub active_threads: AtomicU64,
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pub get_range_us: AtomicU64,
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last_age: AtomicU8,
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last_age_time: AtomicU64,
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pub flush_scan_us: AtomicU64,
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pub flush_update_us: AtomicU64,
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pub flush_remove_us: AtomicU64,
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last_time: AtomicInterval,
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}
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@ -163,6 +167,27 @@ impl BucketMapHolderStats {
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("items", self.items.swap(0, Ordering::Relaxed), i64),
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("keys", self.keys.swap(0, Ordering::Relaxed), i64),
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("ms_per_age", ms_per_age, i64),
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(
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"flush_scan_us",
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self.flush_scan_us.swap(0, Ordering::Relaxed),
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i64
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),
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(
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"flush_update_us",
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self.flush_update_us.swap(0, Ordering::Relaxed),
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i64
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),
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(
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"flush_remove_us",
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self.flush_remove_us.swap(0, Ordering::Relaxed),
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i64
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),
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(
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"flush_entries_updated_on_disk",
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self.flush_entries_updated_on_disk
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.swap(0, Ordering::Relaxed),
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i64
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),
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);
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}
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}
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@ -515,6 +515,11 @@ impl<T: IndexValue> InMemAccountsIndex<T> {
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self.storage.wait_dirty_or_aged.notify_one();
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}
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fn should_remove_from_mem(&self, current_age: Age, entry: &AccountMapEntry<T>) -> bool {
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// this could be tunable dynamically based on memory pressure
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current_age == entry.age()
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}
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fn flush_internal(&self) {
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let was_dirty = self.bin_dirty.swap(false, Ordering::Acquire);
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let current_age = self.storage.current_age();
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@ -524,21 +529,52 @@ impl<T: IndexValue> InMemAccountsIndex<T> {
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return;
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}
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let map = self.map().read().unwrap();
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for (_k, _v) in map.iter() {
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/*
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if v.dirty() {
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// step 1: clear the dirty flag
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// step 2: perform the update on disk based on the fields in the entry
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// If a parallel operation dirties the item again - even while this flush is occurring,
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// the last thing the writer will do, after updating contents, is set_dirty(true)
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// That prevents dropping an item from cache before disk is updated to latest in mem.
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v.set_dirty(false);
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let mut removes = Vec::default();
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let disk = self.storage.disk.as_ref().unwrap();
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// soon, this will update disk from the in-mem contents
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let mut updates = Vec::default();
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let m = Measure::start("flush_scan");
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// scan and update loop
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{
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let map = self.map().read().unwrap();
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for (k, v) in map.iter() {
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if v.dirty() {
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// step 1: clear the dirty flag
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// step 2: perform the update on disk based on the fields in the entry
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// If a parallel operation dirties the item again - even while this flush is occurring,
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// the last thing the writer will do, after updating contents, is set_dirty(true)
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// That prevents dropping an item from cache before disk is updated to latest in mem.
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v.set_dirty(false);
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updates.push((*k, Arc::clone(v)));
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}
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if self.should_remove_from_mem(current_age, v) {
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removes.push(*k);
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}
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}
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*/
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}
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Self::update_time_stat(&self.stats().flush_scan_us, m);
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let mut flush_entries_updated_on_disk = 0;
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// happens outside of lock on in-mem cache
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// it is possible that the item in the cache is marked as dirty while these updates are happening. That is ok.
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let m = Measure::start("flush_update");
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for (k, v) in updates.into_iter() {
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if v.dirty() {
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continue; // marked dirty after we grabbed it above, so handle this the next time this bucket is flushed
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}
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flush_entries_updated_on_disk += 1;
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disk.insert(&k, (&v.slot_list.read().unwrap(), v.ref_count()));
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}
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Self::update_time_stat(&self.stats().flush_update_us, m);
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Self::update_stat(
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&self.stats().flush_entries_updated_on_disk,
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flush_entries_updated_on_disk,
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);
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// loop that processes 'removes' will go here
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if iterate_for_age {
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// completed iteration of the buckets at the current age
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assert_eq!(current_age, self.storage.current_age());
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