mirror of
https://github.com/meilisearch/meilisearch.git
synced 2024-11-26 03:55:07 +08:00
Another algorithm for the ARC cache
This commit is contained in:
Clément Renault
parent
91ec0bdaf4
commit
b03ec3f603
@ -263,9 +263,7 @@ pub struct ArcCache<K, V> {
|
||||
frequent_set: LruCache<K, V>,
|
||||
frequent_evicted: LruCache<K, ()>,
|
||||
capacity: NonZeroUsize,
|
||||
// negative means shrinking recent and increasing frequent
|
||||
// positive means shrinking frequent and increasing recent
|
||||
p: isize,
|
||||
p: usize,
|
||||
}
|
||||
|
||||
impl<K: Eq + Hash, V> ArcCache<K, V> {
|
||||
@ -282,105 +280,131 @@ impl<K: Eq + Hash, V> ArcCache<K, V> {
|
||||
}
|
||||
|
||||
impl<K: Eq + Hash + Clone, V> ArcCache<K, V> {
|
||||
pub fn get_mut<Q>(&mut self, k: &Q) -> (Option<&mut V>, Option<(K, V)>)
|
||||
fn get_mut<Q>(&mut self, k: &Q) -> (Option<&mut V>, Option<(K, V)>)
|
||||
where
|
||||
K: Borrow<Q>,
|
||||
Q: Hash + Eq + ?Sized,
|
||||
{
|
||||
let evicted = match self.recent_set.pop_entry(k) {
|
||||
Some((key, value)) => self.frequent_set.push(key, value),
|
||||
None => None,
|
||||
};
|
||||
|
||||
(self.frequent_set.get_mut(k), evicted)
|
||||
if let Some((key, value)) = self.recent_set.pop_entry(k) {
|
||||
let evicted = self.frequent_set.push(key, value);
|
||||
(self.frequent_set.get_mut(k), evicted)
|
||||
} else {
|
||||
(self.frequent_set.get_mut(k), None)
|
||||
}
|
||||
}
|
||||
|
||||
pub fn push(&mut self, k: K, v: V) -> Vec<(K, V)> {
|
||||
fn push(&mut self, key: K, value: V) -> Vec<(K, V)> {
|
||||
let mut evicted = Vec::new();
|
||||
|
||||
if self.frequent_set.contains(&k) {
|
||||
if let Some(evicted_entry) = self.frequent_set.push(k, v) {
|
||||
if self.recent_set.contains(&key) {
|
||||
if let Some(evicted_entry) = self.recent_set.pop_entry(&key) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if let Some((k, v)) = self.recent_set.pop_entry(&k) {
|
||||
if let Some(evicted_entry) = self.frequent_set.push(k, v) {
|
||||
if let Some(evicted_entry) = self.frequent_set.push(key, value) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if self.frequent_evicted.contains(&k) {
|
||||
let delta = if self.recent_evicted.len() > self.frequent_evicted.len() {
|
||||
self.recent_evicted.len() / self.frequent_evicted.len()
|
||||
} else {
|
||||
1
|
||||
};
|
||||
return evicted;
|
||||
}
|
||||
|
||||
if (delta as isize) < self.p {
|
||||
self.p = self.p.saturating_sub(delta as isize);
|
||||
} else {
|
||||
self.p = 0;
|
||||
}
|
||||
// TODO not sure that I understand
|
||||
if self.frequent_set.contains(&key) {
|
||||
self.frequent_set.get(&key);
|
||||
return evicted;
|
||||
}
|
||||
|
||||
if self.recent_set.len() + self.frequent_set.len() >= self.capacity.get() {
|
||||
if let Some(evicted_entry) = self.replace(true) {
|
||||
evicted.push(evicted_entry);
|
||||
if self.recent_set.len() + self.frequent_set.len() == self.capacity.get() {
|
||||
if self.recent_set.len() < self.capacity.get() {
|
||||
if self.recent_set.len() + self.recent_evicted.len() == self.capacity.get() {
|
||||
self.recent_evicted.pop_lru();
|
||||
}
|
||||
if let Some((lru_key, lru_value)) = self.frequent_set.pop_lru() {
|
||||
self.frequent_evicted.put(lru_key.clone(), ());
|
||||
evicted.push((lru_key, lru_value));
|
||||
}
|
||||
} else if let Some((lru_key, lru_value)) = self.recent_set.pop_lru() {
|
||||
self.recent_evicted.put(lru_key.clone(), ());
|
||||
evicted.push((lru_key, lru_value));
|
||||
}
|
||||
}
|
||||
|
||||
self.frequent_evicted.pop(&k);
|
||||
if let Some(evicted_entry) = self.frequent_set.push(k, v) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if self.recent_evicted.contains(&k) {
|
||||
let delta = if self.frequent_evicted.len() > self.recent_evicted.len() {
|
||||
if self.recent_evicted.contains(&key) {
|
||||
let delta = if self.recent_evicted.len() >= self.frequent_evicted.len() {
|
||||
1
|
||||
} else {
|
||||
self.frequent_evicted.len() / self.recent_evicted.len()
|
||||
} else {
|
||||
1
|
||||
};
|
||||
|
||||
if (delta as isize) <= (self.capacity.get() as isize) - self.p {
|
||||
self.p = self.p.saturating_add(delta as isize);
|
||||
} else {
|
||||
self.p = self.capacity.get() as isize;
|
||||
self.p = (self.p + delta).min(self.capacity.get());
|
||||
self.replace(&key);
|
||||
self.recent_evicted.pop(&key);
|
||||
if let Some(evicted_entry) = self.frequent_set.push(key, value) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
|
||||
if self.recent_set.len() + self.frequent_set.len() >= self.capacity.get() {
|
||||
if let Some(evicted_entry) = self.replace(false) {
|
||||
} else if self.frequent_evicted.contains(&key) {
|
||||
let delta = if self.frequent_evicted.len() >= self.recent_evicted.len() {
|
||||
1
|
||||
} else {
|
||||
self.recent_evicted.len() / self.frequent_evicted.len()
|
||||
};
|
||||
self.p = self.p.saturating_sub(delta);
|
||||
if let Some(evicted_entry) = self.replace(&key) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
self.frequent_evicted.pop(&key);
|
||||
if let Some(evicted_entry) = self.frequent_set.push(key, value) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else {
|
||||
if self.recent_set.len() + self.recent_evicted.len() == self.capacity.get() {
|
||||
if self.recent_set.len() < self.capacity.get() {
|
||||
self.recent_evicted.pop_lru();
|
||||
if let Some(evicted_entry) = self.replace(&key) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if let Some(evicted_entry) = self.recent_set.pop_lru() {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if self.recent_set.len()
|
||||
+ self.frequent_set.len()
|
||||
+ self.recent_evicted.len()
|
||||
+ self.frequent_evicted.len()
|
||||
>= self.capacity.get()
|
||||
{
|
||||
if self.recent_set.len()
|
||||
+ self.frequent_set.len()
|
||||
+ self.recent_evicted.len()
|
||||
+ self.frequent_evicted.len()
|
||||
== 2 * self.capacity.get()
|
||||
{
|
||||
self.frequent_evicted.pop_lru();
|
||||
}
|
||||
if let Some(evicted_entry) = self.replace(&key) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
}
|
||||
|
||||
self.recent_evicted.pop(&k);
|
||||
if let Some(evicted_entry) = self.frequent_set.push(k, v) {
|
||||
evicted.push(evicted_entry)
|
||||
}
|
||||
} else if self.recent_set.len() + self.frequent_set.len() >= self.capacity.get() {
|
||||
if let Some(evicted_entry) = self.replace(false) {
|
||||
if let Some(evicted_entry) = self.recent_set.push(key, value) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
} else if let Some(evicted_entry) = self.recent_set.push(k, v) {
|
||||
evicted.push(evicted_entry);
|
||||
}
|
||||
|
||||
evicted
|
||||
}
|
||||
|
||||
fn replace(&mut self, frequent_evicted_contains_key: bool) -> Option<(K, V)> {
|
||||
fn replace(&mut self, key: &K) -> Option<(K, V)> {
|
||||
if !self.recent_set.is_empty()
|
||||
&& (self.recent_set.len() as isize > self.p
|
||||
|| (self.recent_set.len() as isize == self.p && frequent_evicted_contains_key))
|
||||
&& (self.recent_set.len() > self.p
|
||||
|| (self.frequent_evicted.contains(key) && self.recent_set.len() == self.p))
|
||||
{
|
||||
match self.recent_set.pop_lru() {
|
||||
Some((key, value)) => {
|
||||
self.recent_evicted.push(key.clone(), ());
|
||||
Some((key, value))
|
||||
}
|
||||
None => None,
|
||||
if let Some((lru_key, lru_value)) = self.recent_set.pop_lru() {
|
||||
self.recent_evicted.put(lru_key.clone(), ());
|
||||
return Some((lru_key, lru_value));
|
||||
}
|
||||
} else if let Some((key, value)) = self.frequent_set.pop_lru() {
|
||||
self.frequent_evicted.push(key.clone(), ());
|
||||
Some((key, value))
|
||||
} else {
|
||||
None
|
||||
} else if let Some((lru_key, lru_value)) = self.frequent_set.pop_lru() {
|
||||
self.frequent_evicted.put(lru_key.clone(), ());
|
||||
return Some((lru_key, lru_value));
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user