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Uses dashmap for cache_for_accounts_lt_hash
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@brooksprumo
brooksprumo committed Dec 16, 2024
1 parent 47ad9a1 commit 79b03d2
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Showing 2 changed files with 28 additions and 44 deletions.
15 changes: 6 additions & 9 deletions runtime/src/bank.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,7 +59,7 @@ use {
verify_precompiles::verify_precompiles,
},
accounts_lt_hash::{CacheValue as AccountsLtHashCacheValue, Stats as AccountsLtHashStats},
ahash::{AHashMap, AHashSet},
ahash::AHashSet,
byteorder::{ByteOrder, LittleEndian},
dashmap::{DashMap, DashSet},
log::*,
Expand Down Expand Up @@ -940,7 +940,7 @@ pub struct Bank {
///
/// Note: The initial state must be strictly from an ancestor,
/// and not an intermediate state within this slot.
cache_for_accounts_lt_hash: RwLock<AHashMap<Pubkey, AccountsLtHashCacheValue>>,
cache_for_accounts_lt_hash: DashMap<Pubkey, AccountsLtHashCacheValue, ahash::RandomState>,

/// Stats related to the accounts lt hash
stats_for_accounts_lt_hash: AccountsLtHashStats,
Expand Down Expand Up @@ -1164,7 +1164,7 @@ impl Bank {
#[cfg(feature = "dev-context-only-utils")]
hash_overrides: Arc::new(Mutex::new(HashOverrides::default())),
accounts_lt_hash: Mutex::new(AccountsLtHash(LtHash::identity())),
cache_for_accounts_lt_hash: RwLock::new(AHashMap::new()),
cache_for_accounts_lt_hash: DashMap::default(),
stats_for_accounts_lt_hash: AccountsLtHashStats::default(),
block_id: RwLock::new(None),
bank_hash_stats: AtomicBankHashStats::default(),
Expand Down Expand Up @@ -1420,7 +1420,7 @@ impl Bank {
#[cfg(feature = "dev-context-only-utils")]
hash_overrides: parent.hash_overrides.clone(),
accounts_lt_hash: Mutex::new(parent.accounts_lt_hash.lock().unwrap().clone()),
cache_for_accounts_lt_hash: RwLock::new(AHashMap::new()),
cache_for_accounts_lt_hash: DashMap::default(),
stats_for_accounts_lt_hash: AccountsLtHashStats::default(),
block_id: RwLock::new(None),
bank_hash_stats: AtomicBankHashStats::default(),
Expand Down Expand Up @@ -1493,11 +1493,8 @@ impl Bank {
let accounts_modified_this_slot =
new.rc.accounts.accounts_db.get_pubkeys_for_slot(slot);
let num_accounts_modified_this_slot = accounts_modified_this_slot.len();
let cache_for_accounts_lt_hash =
new.cache_for_accounts_lt_hash.get_mut().unwrap();
cache_for_accounts_lt_hash.reserve(num_accounts_modified_this_slot);
for pubkey in accounts_modified_this_slot {
cache_for_accounts_lt_hash
new.cache_for_accounts_lt_hash
.entry(pubkey)
.or_insert(AccountsLtHashCacheValue::BankNew);
}
Expand Down Expand Up @@ -1833,7 +1830,7 @@ impl Bank {
#[cfg(feature = "dev-context-only-utils")]
hash_overrides: Arc::new(Mutex::new(HashOverrides::default())),
accounts_lt_hash: Mutex::new(AccountsLtHash(LtHash([0xBAD1; LtHash::NUM_ELEMENTS]))),
cache_for_accounts_lt_hash: RwLock::new(AHashMap::new()),
cache_for_accounts_lt_hash: DashMap::default(),
stats_for_accounts_lt_hash: AccountsLtHashStats::default(),
block_id: RwLock::new(None),
bank_hash_stats: AtomicBankHashStats::new(&fields.bank_hash_stats),
Expand Down
57 changes: 22 additions & 35 deletions runtime/src/bank/accounts_lt_hash.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ impl Bank {
// And since `strictly_ancestors` is empty, loading the previous version of the account
// from accounts db will return `None` (aka Dead), which is the correct behavior.
assert!(strictly_ancestors.is_empty());
self.cache_for_accounts_lt_hash.write().unwrap().clear();
self.cache_for_accounts_lt_hash.clear();
}

// Get all the accounts stored in this slot.
Expand Down Expand Up @@ -133,7 +133,6 @@ impl Bank {
// And a single page is likely the smallest size a disk read will actually read.
// This can be tuned larger, but likely not smaller.
const CHUNK_SIZE: usize = 128;
let cache_for_accounts_lt_hash = self.cache_for_accounts_lt_hash.read().unwrap();
accounts_curr
.par_iter()
.fold_chunks(
Expand All @@ -142,9 +141,13 @@ impl Bank {
|mut accum, (pubkey, curr_account)| {
// load the initial state of the account
let (initial_state_of_account, measure_load) = meas_dur!({
match cache_for_accounts_lt_hash.get(pubkey) {
let cache_value = self
.cache_for_accounts_lt_hash
.get(pubkey)
.map(|entry| entry.value().clone());
match cache_value {
Some(CacheValue::InspectAccount(initial_state_of_account)) => {
initial_state_of_account.clone()
initial_state_of_account
}
Some(CacheValue::BankNew) | None => {
accum.1.num_cache_misses += 1;
Expand Down Expand Up @@ -313,17 +316,11 @@ impl Bank {

// Only insert the account the *first* time we see it.
// We want to capture the value of the account *before* any modifications during this slot.
let (is_in_cache, lookup_time) = meas_dur!({
self.cache_for_accounts_lt_hash
.read()
.unwrap()
.contains_key(address)
});
let (is_in_cache, lookup_time) =
meas_dur!(self.cache_for_accounts_lt_hash.contains_key(address));
if !is_in_cache {
let (_, insert_time) = meas_dur!({
self.cache_for_accounts_lt_hash
.write()
.unwrap()
.entry(*address)
.or_insert_with(|| {
let initial_state_of_account = match account_state {
Expand Down Expand Up @@ -680,7 +677,7 @@ mod tests {
assert!(bank.is_accounts_lt_hash_enabled());

// the cache should start off empty
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 0);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 0);

// ensure non-writable accounts are *not* added to the cache
bank.inspect_account_for_accounts_lt_hash(
Expand All @@ -693,30 +690,25 @@ mod tests {
&AccountState::Alive(&AccountSharedData::default()),
false,
);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 0);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 0);

// ensure *new* accounts are added to the cache
let address = Pubkey::new_unique();
bank.inspect_account_for_accounts_lt_hash(&address, &AccountState::Dead, true);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 1);
assert!(bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.contains_key(&address));
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 1);
assert!(bank.cache_for_accounts_lt_hash.contains_key(&address));

// ensure *existing* accounts are added to the cache
let address = Pubkey::new_unique();
let initial_lamports = 123;
let mut account = AccountSharedData::new(initial_lamports, 0, &Pubkey::default());
bank.inspect_account_for_accounts_lt_hash(&address, &AccountState::Alive(&account), true);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 2);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 2);
if let CacheValue::InspectAccount(InitialStateOfAccount::Alive(cached_account)) = bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.get(&address)
.unwrap()
.value()
{
assert_eq!(*cached_account, account);
} else {
Expand All @@ -727,13 +719,12 @@ mod tests {
let updated_lamports = account.lamports() + 1;
account.set_lamports(updated_lamports);
bank.inspect_account_for_accounts_lt_hash(&address, &AccountState::Alive(&account), true);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 2);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 2);
if let CacheValue::InspectAccount(InitialStateOfAccount::Alive(cached_account)) = bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.get(&address)
.unwrap()
.value()
{
assert_eq!(cached_account.lamports(), initial_lamports);
} else {
Expand All @@ -744,13 +735,12 @@ mod tests {
{
let address = Pubkey::new_unique();
bank.inspect_account_for_accounts_lt_hash(&address, &AccountState::Dead, true);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 3);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 3);
match bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.get(&address)
.unwrap()
.value()
{
CacheValue::InspectAccount(InitialStateOfAccount::Dead) => {
// this is expected, nothing to do here
Expand All @@ -763,13 +753,12 @@ mod tests {
&AccountState::Alive(&AccountSharedData::default()),
true,
);
assert_eq!(bank.cache_for_accounts_lt_hash.read().unwrap().len(), 3);
assert_eq!(bank.cache_for_accounts_lt_hash.len(), 3);
match bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.get(&address)
.unwrap()
.value()
{
CacheValue::InspectAccount(InitialStateOfAccount::Dead) => {
// this is expected, nothing to do here
Expand Down Expand Up @@ -1049,10 +1038,8 @@ mod tests {
];
let mut actual_cache: Vec<_> = bank
.cache_for_accounts_lt_hash
.read()
.unwrap()
.iter()
.map(|(k, v)| (*k, v.clone()))
.map(|entry| (*entry.key(), entry.value().clone()))
.collect();
actual_cache.sort_unstable_by(|a, b| a.0.cmp(&b.0));
assert_eq!(expected_cache, actual_cache.as_slice());
Expand Down

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