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Avoid alloc due to vector pushes (#6632)

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This commit is contained in:
Jack May
2019-10-30 21:55:17 -07:00
committed by GitHub
parent 83d5115a02
commit 5264fded00
3 changed files with 38 additions and 32 deletions
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6
runtime/src/accounts.rs
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@@ -116,8 +116,8 @@ impl Accounts {
// There is no way to predict what program will execute without an error
// If a fee can pay for execution then the program will be scheduled
let mut accounts: TransactionAccounts = vec![];
let mut rents: TransactionRents = vec![];
let mut accounts: TransactionAccounts = Vec::with_capacity(message.account_keys.len());
let mut rents: TransactionRents = Vec::with_capacity(message.account_keys.len());
for key in message
.account_keys
.iter()
@@ -633,7 +633,7 @@ impl Accounts {
res: &'a [Result<()>],
loaded: &'a mut [Result<TransactionLoadResult>],
) -> Vec<(&'a Pubkey, &'a Account)> {
let mut accounts = Vec::new();
let mut accounts = Vec::with_capacity(loaded.len());
for (i, (raccs, tx)) in loaded
.iter_mut()
.zip(OrderedIterator::new(txs, txs_iteration_order))