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optimize memdb #1258

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optimize memdb #1258

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6 changes: 4 additions & 2 deletions core/store/ledgerstore/ledger_store.go
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Original file line number Diff line number Diff line change
Expand Up @@ -717,8 +717,10 @@ func (this *LedgerStoreImp) executeBlock(block *types.Block) (result store.Execu
})

cache := storage.NewCacheDB(overlay)
for _, tx := range block.Transactions {
cache.Reset()
for i, tx := range block.Transactions {
if i > 0 {
cache.Reset()
}
notify, crossStateHashes, e := this.handleTransaction(overlay, cache, gasTable, block, tx)
if e != nil {
err = e
Expand Down
28 changes: 21 additions & 7 deletions core/store/overlaydb/memdb.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,8 @@
package overlaydb

import (
"math/rand"
"math"
_ "unsafe" // required by go:linkname

"github.com/syndtr/goleveldb/leveldb/comparer"
"github.com/syndtr/goleveldb/leveldb/errors"
Expand Down Expand Up @@ -184,26 +185,41 @@ const (
// MemDB is an in-memdb key/value database.
type MemDB struct {
cmp comparer.BasicComparer
rnd *rand.Rand

kvData []byte
// Node data:
// [0] : KV offset
// [1] : Key length
// [2] : Value length
// [3] : Height
// [3..height] : Next nodes
// [0..height] : Next nodes
nodeData []int
prevNode [tMaxHeight]int
maxHeight int
n int
kvSize int
}

//go:linkname fastRand runtime.fastrand
func fastRand() uint32

var probabilityTable []uint32

const probability float64 = 1.0 / 4

func init() {
for i := 1; i < tMaxHeight; i++ {
prob := math.Pow(probability, float64(i))
probabilityTable = append(probabilityTable, uint32(prob*math.MaxUint32))
}
}

func (p *MemDB) randHeight() (h int) {
const branching = 4

r := fastRand()

h = 1
for h < tMaxHeight && p.rnd.Int()%branching == 0 {
for h < tMaxHeight && r < probabilityTable[h-1] {
h++
}
return
Expand Down Expand Up @@ -415,7 +431,6 @@ func (p *MemDB) Len() int {

// Reset resets the MemDB to initial empty state. Allows reuse the buffer.
func (p *MemDB) Reset() {
p.rnd = rand.New(rand.NewSource(0xdeadbeef))
p.maxHeight = 1
p.n = 0
p.kvSize = 0
Expand All @@ -442,7 +457,6 @@ func (p *MemDB) Reset() {
func NewMemDB(capacity int, kvNum int) *MemDB {
p := &MemDB{
cmp: comparer.DefaultComparer,
rnd: rand.New(rand.NewSource(0xdeadbeef)),
maxHeight: 1,
kvData: make([]byte, 0, capacity),
nodeData: make([]int, 4+tMaxHeight, (4+tMaxHeight)*(1+kvNum)),
Expand Down