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Retain executor cache counts (backport #22322) #22340

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Jan 6, 2022
Merged

Retain executor cache counts (backport #22322) #22340

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46 changes: 29 additions & 17 deletions runtime/src/bank.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -429,37 +429,43 @@ impl CachedExecutors {
executors: HashMap::new(),
}
}

fn get(&self, pubkey: &Pubkey) -> Option<Arc<dyn Executor>> {
self.executors.get(pubkey).map(|entry| {
entry.epoch_count.fetch_add(1, Relaxed);
entry.executor.clone()
})
}

fn put(&mut self, pubkey: &Pubkey, executor: Arc<dyn Executor>) {
if !self.executors.contains_key(pubkey) && self.executors.len() >= self.max {
let mut least = u64::MAX;
let default_key = Pubkey::default();
let mut least_key = &default_key;

for (key, entry) in self.executors.iter() {
let count = entry.prev_epoch_count + entry.epoch_count.load(Relaxed);
if count < least {
least = count;
least_key = key;
let entry = if let Some(mut entry) = self.executors.remove(pubkey) {
entry.executor = executor;
entry
} else {
if self.executors.len() >= self.max {
let mut least = u64::MAX;
let default_key = Pubkey::default();
let mut least_key = &default_key;

for (key, entry) in self.executors.iter() {
let count = entry.prev_epoch_count + entry.epoch_count.load(Relaxed);
if count < least {
least = count;
least_key = key;
}
}
let least_key = *least_key;
let _ = self.executors.remove(&least_key);
}
let least_key = *least_key;
let _ = self.executors.remove(&least_key);
}
let _ = self.executors.insert(
*pubkey,
CachedExecutorsEntry {
prev_epoch_count: 0,
epoch_count: AtomicU64::new(0),
executor,
},
);
}
};
let _ = self.executors.insert(*pubkey, entry);
}

fn remove(&mut self, pubkey: &Pubkey) {
let _ = self.executors.remove(pubkey);
}
Expand Down Expand Up @@ -11917,6 +11923,11 @@ pub(crate) mod tests {
assert!(cache.get(&key4).is_some());
assert!(cache.get(&key3).is_none());

cache.put(&key1, executor.clone());
cache.put(&key3, executor.clone());
assert!(cache.get(&key1).is_some());
assert!(cache.get(&key4).is_none());

cache = cache.clone_with_epoch(2);
assert!(cache.current_epoch == 2);

Expand Down Expand Up @@ -11992,6 +12003,7 @@ pub(crate) mod tests {
assert!(executors.borrow().contains_key(&key3));
assert!(executors.borrow().contains_key(&key4));

// Remove all
bank.remove_executor(&key1);
bank.remove_executor(&key2);
bank.remove_executor(&key3);
Expand Down