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stackitem: add some hint to 'seen' maps

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It's empirical, we usually have one container, but four is likely to fit most
of regular cases.
This commit is contained in:
Roman Khimov 2021-11-30 19:51:52 +03:00
parent 9576e10d04
commit 3eed9d06f8
3 changed files with 11 additions and 5 deletions
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10
pkg/vm/stackitem/serialization.go
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@ -13,6 +13,12 @@ import (
// (including itself).
const MaxDeserialized = 2048
// typicalNumOfItems is the number of items covering most serializaton needs.
// It's a hint used for map creation, so it's not limiting anything, it's just
// a microoptimization to avoid excessive reallocations. Most of the serialized
// items are structs, so there is at least one of them.
const typicalNumOfItems = 4
// ErrRecursive is returned on attempts to serialize some recursive stack item
// (like array including an item with reference to the same array).
var ErrRecursive = errors.New("recursive item")
@ -40,7 +46,7 @@ type deserContext struct {
func Serialize(item Item) ([]byte, error) {
sc := serContext{
allowInvalid: false,
seen: make(map[Item]sliceNoPointer),
seen: make(map[Item]sliceNoPointer, typicalNumOfItems),
}
err := sc.serialize(item)
if err != nil {
@ -69,7 +75,7 @@ func EncodeBinary(item Item, w *io.BinWriter) {
func EncodeBinaryProtected(item Item, w *io.BinWriter) {
sc := serContext{
allowInvalid: true,
seen: make(map[Item]sliceNoPointer),
seen: make(map[Item]sliceNoPointer, typicalNumOfItems),
}
err := sc.serialize(item)
if err != nil {