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core: implement background trie prefetcher

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Squashed from the following commits:

core/state: lazily init snapshot storage map
core/state: fix flawed meter on storage reads
core/state: make statedb/stateobjects reuse a hasher
core/blockchain, core/state: implement new trie prefetcher
core: make trie prefetcher deliver tries to statedb
core/state: refactor trie_prefetcher, export storage tries
blockchain: re-enable the next-block-prefetcher
state: remove panics in trie prefetcher
core/state/trie_prefetcher: address some review concerns

sq
This commit is contained in:
Martin Holst Swende 2020-02-05 13:12:09 +01:00 committed by Péter Szilágyi
parent 93a89b2681
commit 1e1865b73f
No known key found for this signature in database
GPG Key ID: E9AE538CEDF8293D
7 changed files with 395 additions and 34 deletions
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17
core/blockchain.go
View File

@ -203,7 +203,8 @@ type BlockChain struct {
engine consensus.Engine
validator Validator // Block and state validator interface
prefetcher Prefetcher // Block state prefetcher interface
triePrefetcher *state.TriePrefetcher // Trie prefetcher interface
prefetcher Prefetcher
processor Processor // Block transaction processor interface
vmConfig vm.Config
@ -249,6 +250,15 @@ func NewBlockChain(db ethdb.Database, cacheConfig *CacheConfig, chainConfig *par
}
bc.validator = NewBlockValidator(chainConfig, bc, engine)
bc.prefetcher = newStatePrefetcher(chainConfig, bc, engine)
tp := state.NewTriePrefetcher(bc.stateCache)
bc.wg.Add(1)
go func() {
tp.Loop()
bc.wg.Done()
}()
bc.triePrefetcher = tp
bc.processor = NewStateProcessor(chainConfig, bc, engine)
var err error
@ -991,6 +1001,9 @@ func (bc *BlockChain) Stop() {
bc.scope.Close()
close(bc.quit)
bc.StopInsert()
if bc.triePrefetcher != nil {
bc.triePrefetcher.Close()
}
bc.wg.Wait()
// Ensure that the entirety of the state snapshot is journalled to disk.
@ -1857,6 +1870,7 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals bool) (int, er
parent = bc.GetHeader(block.ParentHash(), block.NumberU64()-1)
}
statedb, err := state.New(parent.Root, bc.stateCache, bc.snaps)
statedb.UsePrefetcher(bc.triePrefetcher)
if err != nil {
return it.index, err
}
@ -1891,7 +1905,6 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals bool) (int, er
storageUpdateTimer.Update(statedb.StorageUpdates) // Storage updates are complete, we can mark them
snapshotAccountReadTimer.Update(statedb.SnapshotAccountReads) // Account reads are complete, we can mark them
snapshotStorageReadTimer.Update(statedb.SnapshotStorageReads) // Storage reads are complete, we can mark them
triehash := statedb.AccountHashes + statedb.StorageHashes // Save to not double count in validation
trieproc := statedb.SnapshotAccountReads + statedb.AccountReads + statedb.AccountUpdates
trieproc += statedb.SnapshotStorageReads + statedb.StorageReads + statedb.StorageUpdates

12
core/state/database.go
View File

@ -129,12 +129,20 @@ type cachingDB struct {
// OpenTrie opens the main account trie at a specific root hash.
func (db *cachingDB) OpenTrie(root common.Hash) (Trie, error) {
return trie.NewSecure(root, db.db)
tr, err := trie.NewSecure(root, db.db)
if err != nil {
return nil, err
}
return tr, nil
}
// OpenStorageTrie opens the storage trie of an account.
func (db *cachingDB) OpenStorageTrie(addrHash, root common.Hash) (Trie, error) {
return trie.NewSecure(root, db.db)
tr, err := trie.NewSecure(root, db.db)
if err != nil {
return nil, err
}
return tr, nil
}
// CopyTrie returns an independent copy of the given trie.

58
core/state/state_object.go
View File

@ -156,6 +156,14 @@ func (s *stateObject) touch() {
}
func (s *stateObject) getTrie(db Database) Trie {
if s.trie == nil {
// Try fetching from prefetcher first
// We don't prefetch empty tries
if s.data.Root != emptyRoot && s.db.prefetcher != nil {
// When the miner is creating the pending state, there is no
// prefetcher
s.trie = s.db.prefetcher.GetTrie(s.data.Root)
}
if s.trie == nil {
var err error
s.trie, err = db.OpenStorageTrie(s.addrHash, s.data.Root)
@ -164,6 +172,7 @@ func (s *stateObject) getTrie(db Database) Trie {
s.setError(fmt.Errorf("can't create storage trie: %v", err))
}
}
}
return s.trie
}
@ -199,10 +208,22 @@ func (s *stateObject) GetCommittedState(db Database, key common.Hash) common.Has
var (
enc []byte
err error
meter *time.Duration
)
readStart := time.Now()
if metrics.EnabledExpensive {
// If the snap is 'under construction', the first lookup may fail. If that
// happens, we don't want to double-count the time elapsed. Thus this
// dance with the metering.
defer func() {
if meter != nil {
*meter += time.Since(readStart)
}
}()
}
if s.db.snap != nil {
if metrics.EnabledExpensive {
defer func(start time.Time) { s.db.SnapshotStorageReads += time.Since(start) }(time.Now())
meter = &s.db.SnapshotStorageReads
}
// If the object was destructed in *this* block (and potentially resurrected),
// the storage has been cleared out, and we should *not* consult the previous
@ -217,8 +238,14 @@ func (s *stateObject) GetCommittedState(db Database, key common.Hash) common.Has
}
// If snapshot unavailable or reading from it failed, load from the database
if s.db.snap == nil || err != nil {
if meter != nil {
// If we already spent time checking the snapshot, account for it
// and reset the readStart
*meter += time.Since(readStart)
readStart = time.Now()
}
if metrics.EnabledExpensive {
defer func(start time.Time) { s.db.StorageReads += time.Since(start) }(time.Now())
meter = &s.db.StorageReads
}
if enc, err = s.getTrie(db).TryGet(key.Bytes()); err != nil {
s.setError(err)
@ -283,8 +310,13 @@ func (s *stateObject) setState(key, value common.Hash) {
// finalise moves all dirty storage slots into the pending area to be hashed or
// committed later. It is invoked at the end of every transaction.
func (s *stateObject) finalise() {
trieChanges := make([]common.Hash, 0, len(s.dirtyStorage))
for key, value := range s.dirtyStorage {
s.pendingStorage[key] = value
trieChanges = append(trieChanges, key)
}
if len(trieChanges) > 0 && s.db.prefetcher != nil && s.data.Root != emptyRoot {
s.db.prefetcher.PrefetchStorage(s.data.Root, trieChanges)
}
if len(s.dirtyStorage) > 0 {
s.dirtyStorage = make(Storage)
@ -303,18 +335,11 @@ func (s *stateObject) updateTrie(db Database) Trie {
if metrics.EnabledExpensive {
defer func(start time.Time) { s.db.StorageUpdates += time.Since(start) }(time.Now())
}
// Retrieve the snapshot storage map for the object
// The snapshot storage map for the object
var storage map[common.Hash][]byte
if s.db.snap != nil {
// Retrieve the old storage map, if available, create a new one otherwise
storage = s.db.snapStorage[s.addrHash]
if storage == nil {
storage = make(map[common.Hash][]byte)
s.db.snapStorage[s.addrHash] = storage
}
}
// Insert all the pending updates into the trie
tr := s.getTrie(db)
hasher := s.db.hasher
for key, value := range s.pendingStorage {
// Skip noop changes, persist actual changes
if value == s.originStorage[key] {
@ -331,8 +356,15 @@ func (s *stateObject) updateTrie(db Database) Trie {
s.setError(tr.TryUpdate(key[:], v))
}
// If state snapshotting is active, cache the data til commit
if storage != nil {
storage[crypto.Keccak256Hash(key[:])] = v // v will be nil if value is 0x00
if s.db.snap != nil {
if storage == nil {
// Retrieve the old storage map, if available, create a new one otherwise
if storage = s.db.snapStorage[s.addrHash]; storage == nil {
storage = make(map[common.Hash][]byte)
s.db.snapStorage[s.addrHash] = storage
}
}
storage[crypto.HashData(hasher, key[:])] = v // v will be nil if value is 0x00
}
}
if len(s.pendingStorage) > 0 {

41
core/state/statedb.go
View File

@ -63,7 +63,10 @@ func (n *proofList) Delete(key []byte) error {
// * Accounts
type StateDB struct {
db Database
prefetcher *TriePrefetcher
originalRoot common.Hash // The pre-state root, before any changes were made
trie Trie
hasher crypto.KeccakState
snaps *snapshot.Tree
snap snapshot.Snapshot
@ -125,6 +128,7 @@ func New(root common.Hash, db Database, snaps *snapshot.Tree) (*StateDB, error)
sdb := &StateDB{
db: db,
trie: tr,
originalRoot: root,
snaps: snaps,
stateObjects: make(map[common.Address]*stateObject),
stateObjectsPending: make(map[common.Address]struct{}),
@ -133,6 +137,7 @@ func New(root common.Hash, db Database, snaps *snapshot.Tree) (*StateDB, error)
preimages: make(map[common.Hash][]byte),
journal: newJournal(),
accessList: newAccessList(),
hasher: crypto.NewKeccakState(),
}
if sdb.snaps != nil {
if sdb.snap = sdb.snaps.Snapshot(root); sdb.snap != nil {
@ -144,6 +149,13 @@ func New(root common.Hash, db Database, snaps *snapshot.Tree) (*StateDB, error)
return sdb, nil
}
func (s *StateDB) UsePrefetcher(prefetcher *TriePrefetcher) {
if prefetcher != nil {
s.prefetcher = prefetcher
s.prefetcher.Resume(s.originalRoot)
}
}
// setError remembers the first non-nil error it is called with.
func (s *StateDB) setError(err error) {
if s.dbErr == nil {
@ -532,7 +544,7 @@ func (s *StateDB) getDeletedStateObject(addr common.Address) *stateObject {
defer func(start time.Time) { s.SnapshotAccountReads += time.Since(start) }(time.Now())
}
var acc *snapshot.Account
if acc, err = s.snap.Account(crypto.Keccak256Hash(addr.Bytes())); err == nil {
if acc, err = s.snap.Account(crypto.HashData(s.hasher, addr.Bytes())); err == nil {
if acc == nil {
return nil
}
@ -675,6 +687,7 @@ func (s *StateDB) Copy() *StateDB {
logSize: s.logSize,
preimages: make(map[common.Hash][]byte, len(s.preimages)),
journal: newJournal(),
hasher: crypto.NewKeccakState(),
}
// Copy the dirty states, logs, and preimages
for addr := range s.journal.dirties {
@ -760,6 +773,7 @@ func (s *StateDB) GetRefund() uint64 {
// the journal as well as the refunds. Finalise, however, will not push any updates
// into the tries just yet. Only IntermediateRoot or Commit will do that.
func (s *StateDB) Finalise(deleteEmptyObjects bool) {
var addressesToPrefetch []common.Address
for addr := range s.journal.dirties {
obj, exist := s.stateObjects[addr]
if !exist {
@ -788,7 +802,17 @@ func (s *StateDB) Finalise(deleteEmptyObjects bool) {
}
s.stateObjectsPending[addr] = struct{}{}
s.stateObjectsDirty[addr] = struct{}{}
// At this point, also ship the address off to the precacher. The precacher
// will start loading tries, and when the change is eventually committed,
// the commit-phase will be a lot faster
if s.prefetcher != nil {
addressesToPrefetch = append(addressesToPrefetch, addr)
}
}
if s.prefetcher != nil {
s.prefetcher.PrefetchAddresses(addressesToPrefetch)
}
// Invalidate journal because reverting across transactions is not allowed.
s.clearJournalAndRefund()
}
@ -800,6 +824,21 @@ func (s *StateDB) IntermediateRoot(deleteEmptyObjects bool) common.Hash {
// Finalise all the dirty storage states and write them into the tries
s.Finalise(deleteEmptyObjects)
// Now we're about to start to write changes to the trie. The trie is so
// far _untouched_. We can check with the prefetcher, if it can give us
// a trie which has the same root, but also has some content loaded into it.
// If so, use that one instead.
if s.prefetcher != nil {
s.prefetcher.Pause()
// We only want to do this _once_, if someone calls IntermediateRoot again,
// we shouldn't fetch the trie again
if s.originalRoot != (common.Hash{}) {
if trie := s.prefetcher.GetTrie(s.originalRoot); trie != nil {
s.trie = trie
}
s.originalRoot = common.Hash{}
}
}
for addr := range s.stateObjectsPending {
obj := s.stateObjects[addr]
if obj.deleted {

249
core/state/trie_prefetcher.go Normal file
View File

@ -0,0 +1,249 @@
// Copyright 2020 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package state
import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/metrics"
)
var (
// trieDeliveryMeter counts how many times the prefetcher was unable to supply
// the statedb with a prefilled trie. This meter should be zero -- if it's not, that
// needs to be investigated
trieDeliveryMissMeter = metrics.NewRegisteredMeter("trie/prefetch/deliverymiss", nil)
triePrefetchFetchMeter = metrics.NewRegisteredMeter("trie/prefetch/fetch", nil)
triePrefetchSkipMeter = metrics.NewRegisteredMeter("trie/prefetch/skip", nil)
triePrefetchDropMeter = metrics.NewRegisteredMeter("trie/prefetch/drop", nil)
)
// TriePrefetcher is an active prefetcher, which receives accounts or storage
// items on two channels, and does trie-loading of the items.
// The goal is to get as much useful content into the caches as possible
type TriePrefetcher struct {
requestCh chan (fetchRequest) // Chan to receive requests for data to fetch
cmdCh chan (*cmd) // Chan to control activity, pause/new root
quitCh chan (struct{})
deliveryCh chan (struct{})
db Database
paused bool
storageTries map[common.Hash]Trie
accountTrie Trie
accountTrieRoot common.Hash
}
func NewTriePrefetcher(db Database) *TriePrefetcher {
return &TriePrefetcher{
requestCh: make(chan fetchRequest, 200),
cmdCh: make(chan *cmd),
quitCh: make(chan struct{}),
deliveryCh: make(chan struct{}),
db: db,
}
}
type cmd struct {
root common.Hash
}
type fetchRequest struct {
slots []common.Hash
storageRoot *common.Hash
addresses []common.Address
}
func (p *TriePrefetcher) Loop() {
var (
accountTrieRoot common.Hash
accountTrie Trie
storageTries map[common.Hash]Trie
err error
// Some tracking of performance
skipped int64
fetched int64
paused = true
)
// The prefetcher loop has two distinct phases:
// 1: Paused: when in this state, the accumulated tries are accessible to outside
// callers.
// 2: Active prefetching, awaiting slots and accounts to prefetch
for {
select {
case <-p.quitCh:
return
case cmd := <-p.cmdCh:
// Clear out any old requests
drain:
for {
select {
case req := <-p.requestCh:
if req.slots != nil {
skipped += int64(len(req.slots))
} else {
skipped += int64(len(req.addresses))
}
default:
break drain
}
}
if paused {
// Clear old data
p.storageTries = nil
p.accountTrie = nil
p.accountTrieRoot = common.Hash{}
// Resume again
storageTries = make(map[common.Hash]Trie)
accountTrieRoot = cmd.root
accountTrie, err = p.db.OpenTrie(accountTrieRoot)
if err != nil {
log.Error("Trie prefetcher failed opening trie", "root", accountTrieRoot, "err", err)
}
if accountTrieRoot == (common.Hash{}) {
log.Error("Trie prefetcher unpaused with bad root")
}
paused = false
} else {
// Update metrics at new block events
triePrefetchFetchMeter.Mark(fetched)
triePrefetchSkipMeter.Mark(skipped)
fetched, skipped = 0, 0
// Make the tries accessible
p.accountTrie = accountTrie
p.storageTries = storageTries
p.accountTrieRoot = accountTrieRoot
if cmd.root != (common.Hash{}) {
log.Error("Trie prefetcher paused with non-empty root")
}
paused = true
}
p.deliveryCh <- struct{}{}
case req := <-p.requestCh:
if paused {
continue
}
if sRoot := req.storageRoot; sRoot != nil {
// Storage slots to fetch
var (
storageTrie Trie
err error
)
if storageTrie = storageTries[*sRoot]; storageTrie == nil {
if storageTrie, err = p.db.OpenTrie(*sRoot); err != nil {
log.Warn("trie prefetcher failed opening storage trie", "root", *sRoot, "err", err)
skipped += int64(len(req.slots))
continue
}
storageTries[*sRoot] = storageTrie
}
for _, key := range req.slots {
storageTrie.TryGet(key[:])
}
fetched += int64(len(req.slots))
} else { // an account
for _, addr := range req.addresses {
accountTrie.TryGet(addr[:])
}
fetched += int64(len(req.addresses))
}
}
}
}
// Close stops the prefetcher
func (p *TriePrefetcher) Close() {
if p.quitCh != nil {
close(p.quitCh)
p.quitCh = nil
}
}
// Resume causes the prefetcher to clear out old data, and get ready to
// fetch data concerning the new root
func (p *TriePrefetcher) Resume(root common.Hash) {
p.paused = false
p.cmdCh <- &cmd{
root: root,
}
// Wait for it
<-p.deliveryCh
}
// Pause causes the prefetcher to pause prefetching, and make tries
// accessible to callers via GetTrie
func (p *TriePrefetcher) Pause() {
if p.paused {
return
}
p.paused = true
p.cmdCh <- &cmd{
root: common.Hash{},
}
// Wait for it
<-p.deliveryCh
}
// PrefetchAddresses adds an address for prefetching
func (p *TriePrefetcher) PrefetchAddresses(addresses []common.Address) {
cmd := fetchRequest{
addresses: addresses,
}
// We do an async send here, to not cause the caller to block
//p.requestCh <- cmd
select {
case p.requestCh <- cmd:
default:
triePrefetchDropMeter.Mark(int64(len(addresses)))
}
}
// PrefetchStorage adds a storage root and a set of keys for prefetching
func (p *TriePrefetcher) PrefetchStorage(root common.Hash, slots []common.Hash) {
cmd := fetchRequest{
storageRoot: &root,
slots: slots,
}
// We do an async send here, to not cause the caller to block
//p.requestCh <- cmd
select {
case p.requestCh <- cmd:
default:
triePrefetchDropMeter.Mark(int64(len(slots)))
}
}
// GetTrie returns the trie matching the root hash, or nil if the prefetcher
// doesn't have it.
func (p *TriePrefetcher) GetTrie(root common.Hash) Trie {
if root == p.accountTrieRoot {
return p.accountTrie
}
if storageTrie, ok := p.storageTries[root]; ok {
// Two accounts may well have the same storage root, but we cannot allow
// them both to make updates to the same trie instance. Therefore,
// we need to either delete the trie now, or deliver a copy of the trie.
delete(p.storageTries, root)
return storageTrie
}
trieDeliveryMissMeter.Mark(1)
return nil
}

17
crypto/crypto.go
View File

@ -60,10 +60,23 @@ type KeccakState interface {
Read([]byte) (int, error)
}
// NewKeccakState creates a new KeccakState
func NewKeccakState() KeccakState {
return sha3.NewLegacyKeccak256().(KeccakState)
}
// HashData hashes the provided data using the KeccakState and returns a 32 byte hash
func HashData(kh KeccakState, data []byte) (h common.Hash) {
kh.Reset()
kh.Write(data)
kh.Read(h[:])
return h
}
// Keccak256 calculates and returns the Keccak256 hash of the input data.
func Keccak256(data ...[]byte) []byte {
b := make([]byte, 32)
d := sha3.NewLegacyKeccak256().(KeccakState)
d := NewKeccakState()
for _, b := range data {
d.Write(b)
}
@ -74,7 +87,7 @@ func Keccak256(data ...[]byte) []byte {
// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
// converting it to an internal Hash data structure.
func Keccak256Hash(data ...[]byte) (h common.Hash) {
d := sha3.NewLegacyKeccak256().(KeccakState)
d := NewKeccakState()
for _, b := range data {
d.Write(b)
}

7
crypto/crypto_test.go
View File

@ -42,6 +42,13 @@ func TestKeccak256Hash(t *testing.T) {
checkhash(t, "Sha3-256-array", func(in []byte) []byte { h := Keccak256Hash(in); return h[:] }, msg, exp)
}
func TestKeccak256Hasher(t *testing.T) {
msg := []byte("abc")
exp, _ := hex.DecodeString("4e03657aea45a94fc7d47ba826c8d667c0d1e6e33a64a036ec44f58fa12d6c45")
hasher := NewKeccakState()
checkhash(t, "Sha3-256-array", func(in []byte) []byte { h := HashData(hasher, in); return h[:] }, msg, exp)
}
func TestToECDSAErrors(t *testing.T) {
if _, err := HexToECDSA("0000000000000000000000000000000000000000000000000000000000000000"); err == nil {
t.Fatal("HexToECDSA should've returned error")