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core: optimize GetVerifiedTransactions()

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This simple change improves our BenchmarkTXPerformanceTest by 14%, just
because we don't waste time on reallocations during append().

Before:
   10000            439754 ns/op          218859 B/op        428 allocs/op
ok      github.com/CityOfZion/neo-go/integration        5.423s

After:
   10000            369833 ns/op           87209 B/op        412 allocs/op
ok      github.com/CityOfZion/neo-go/integration        4.612s
This commit is contained in:
Roman Khimov 2019-12-13 19:49:43 +03:00
parent c9257c3de4
commit e631e75718
1 changed files with 6 additions and 3 deletions
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9
pkg/core/mem_pool.go
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@ -269,12 +269,15 @@ func min(sortedPool PoolItems) *PoolItem {
// GetVerifiedTransactions returns a slice of Input from all the transactions in the memory pool
// whose hash is not included in excludedHashes.
func (mp *MemPool) GetVerifiedTransactions() []*transaction.Transaction {
var t []*transaction.Transaction
mp.lock.RLock()
defer mp.lock.RUnlock()
var t = make([]*transaction.Transaction, len(mp.unsortedTxn))
var i int
for _, p := range mp.unsortedTxn {
t = append(t, p.txn)
t[i] = p.txn
i++
}
return t