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Improve shared state cache contention (#9321)

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This commit is contained in:
Arkadiy Paronyan
2021-07-14 13:29:03 +02:00
committed by GitHub
parent 5be9b3fc76
commit de2fdd15cb
2 changed files with 41 additions and 32 deletions
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substrate/client/db/src/storage_cache.rs
+39 -30
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@@ -23,7 +23,7 @@
use std::collections::{VecDeque, HashSet, HashMap};
use std::sync::Arc;
use std::hash::Hash as StdHash;
use parking_lot::{Mutex, RwLock, RwLockUpgradableReadGuard};
use parking_lot::{RwLock, RwLockUpgradableReadGuard};
use linked_hash_map::{LinkedHashMap, Entry};
use hash_db::Hasher;
use sp_runtime::traits::{Block as BlockT, Header, HashFor, NumberFor};
@@ -222,7 +222,7 @@ impl<B: BlockT> Cache<B> {
}
}
pub type SharedCache<B> = Arc<Mutex<Cache<B>>>;
pub type SharedCache<B> = Arc<RwLock<Cache<B>>>;
/// Fix lru storage size for hash (small 64ko).
const FIX_LRU_HASH_SIZE: usize = 65_536;
@@ -234,7 +234,7 @@ pub fn new_shared_cache<B: BlockT>(
) -> SharedCache<B> {
let top = child_ratio.1.saturating_sub(child_ratio.0);
Arc::new(
Mutex::new(
RwLock::new(
Cache {
lru_storage: LRUMap(
LinkedHashMap::new(), 0, shared_cache_size * top / child_ratio.1
@@ -337,7 +337,7 @@ impl<B: BlockT> CacheChanges<B> {
commit_number: Option<NumberFor<B>>,
is_best: bool,
) {
let mut cache = self.shared_cache.lock();
let mut cache = self.shared_cache.write();
trace!(
"Syncing cache, id = (#{:?}, {:?}), parent={:?}, best={}",
commit_number,
@@ -527,12 +527,15 @@ impl<S: StateBackend<HashFor<B>>, B: BlockT> StateBackend<HashFor<B>> for Cachin
return Ok(entry)
}
let mut cache = self.cache.shared_cache.lock();
if Self::is_allowed(Some(key), None, &self.cache.parent_hash, &cache.modifications) {
if let Some(entry) = cache.lru_storage.get(key).map(|a| a.clone()) {
trace!("Found in shared cache: {:?}", HexDisplay::from(&key));
self.usage.tally_key_read(key, entry.as_ref(), true);
return Ok(entry)
{
let cache = self.cache.shared_cache.upgradable_read();
if Self::is_allowed(Some(key), None, &self.cache.parent_hash, &cache.modifications) {
let mut cache = RwLockUpgradableReadGuard::upgrade(cache);
if let Some(entry) = cache.lru_storage.get(key).map(|a| a.clone()) {
trace!("Found in shared cache: {:?}", HexDisplay::from(&key));
self.usage.tally_key_read(key, entry.as_ref(), true);
return Ok(entry)
}
}
}
trace!("Cache miss: {:?}", HexDisplay::from(&key));
@@ -548,11 +551,14 @@ impl<S: StateBackend<HashFor<B>>, B: BlockT> StateBackend<HashFor<B>> for Cachin
trace!("Found hash in local cache: {:?}", HexDisplay::from(&key));
return Ok(entry)
}
let mut cache = self.cache.shared_cache.lock();
if Self::is_allowed(Some(key), None, &self.cache.parent_hash, &cache.modifications) {
if let Some(entry) = cache.lru_hashes.get(key).map(|a| a.0.clone()) {
trace!("Found hash in shared cache: {:?}", HexDisplay::from(&key));
return Ok(entry)
{
let cache = self.cache.shared_cache.upgradable_read();
if Self::is_allowed(Some(key), None, &self.cache.parent_hash, &cache.modifications) {
let mut cache = RwLockUpgradableReadGuard::upgrade(cache);
if let Some(entry) = cache.lru_hashes.get(key).map(|a| a.0.clone()) {
trace!("Found hash in shared cache: {:?}", HexDisplay::from(&key));
return Ok(entry)
}
}
}
trace!("Cache hash miss: {:?}", HexDisplay::from(&key));
@@ -574,13 +580,16 @@ impl<S: StateBackend<HashFor<B>>, B: BlockT> StateBackend<HashFor<B>> for Cachin
self.usage.tally_child_key_read(&key, entry, true)
)
}
let mut cache = self.cache.shared_cache.lock();
if Self::is_allowed(None, Some(&key), &self.cache.parent_hash, &cache.modifications) {
if let Some(entry) = cache.lru_child_storage.get(&key).map(|a| a.clone()) {
trace!("Found in shared cache: {:?}", key);
return Ok(
self.usage.tally_child_key_read(&key, entry, true)
)
{
let cache = self.cache.shared_cache.upgradable_read();
if Self::is_allowed(None, Some(&key), &self.cache.parent_hash, &cache.modifications) {
let mut cache = RwLockUpgradableReadGuard::upgrade(cache);
if let Some(entry) = cache.lru_child_storage.get(&key).map(|a| a.clone()) {
trace!("Found in shared cache: {:?}", key);
return Ok(
self.usage.tally_child_key_read(&key, entry, true)
)
}
}
}
trace!("Cache miss: {:?}", key);
@@ -1274,7 +1283,7 @@ mod tests {
true,
);
// 32 key, 3 byte size
assert_eq!(shared.lock().used_storage_cache_size(), 35 /* bytes */);
assert_eq!(shared.read().used_storage_cache_size(), 35 /* bytes */);
let key = H256::random()[..].to_vec();
s.cache.sync_cache(
@@ -1287,7 +1296,7 @@ mod tests {
true,
);
// 35 + (2 * 32) key, 2 byte size
assert_eq!(shared.lock().used_storage_cache_size(), 101 /* bytes */);
assert_eq!(shared.read().used_storage_cache_size(), 101 /* bytes */);
}
#[test]
@@ -1313,7 +1322,7 @@ mod tests {
true,
);
// 32 key, 4 byte size
assert_eq!(shared.lock().used_storage_cache_size(), 36 /* bytes */);
assert_eq!(shared.read().used_storage_cache_size(), 36 /* bytes */);
let key = H256::random()[..].to_vec();
s.cache.sync_cache(
@@ -1326,7 +1335,7 @@ mod tests {
true,
);
// 32 key, 2 byte size
assert_eq!(shared.lock().used_storage_cache_size(), 34 /* bytes */);
assert_eq!(shared.read().used_storage_cache_size(), 34 /* bytes */);
}
#[test]
@@ -1379,7 +1388,7 @@ mod tests {
// Restart (or unknown block?), clear caches.
{
let mut cache = s.cache.shared_cache.lock();
let mut cache = s.cache.shared_cache.write();
let cache = &mut *cache;
cache.lru_storage.clear();
cache.lru_hashes.clear();
@@ -1426,7 +1435,7 @@ mod tests {
Some(1),
true,
);
assert_eq!(shared.lock().lru_storage.get(&key).unwrap(), &Some(vec![1]));
assert_eq!(shared.write().lru_storage.get(&key).unwrap(), &Some(vec![1]));
let mut s = CachingState::new(
InMemoryBackend::<BlakeTwo256>::default(),
@@ -1445,7 +1454,7 @@ mod tests {
false,
);
assert_eq!(shared.lock().lru_storage.get(&key).unwrap(), &Some(vec![1]));
assert_eq!(shared.write().lru_storage.get(&key).unwrap(), &Some(vec![1]));
let mut s = CachingState::new(
InMemoryBackend::<BlakeTwo256>::default(),
@@ -1800,7 +1809,7 @@ mod qc {
std::mem::swap(fork_chain, &mut new_fork);
self.shared.lock().sync(&retracted, &enacted);
self.shared.write().sync(&retracted, &enacted);
self.head_state(
self.canon.last()