core: split out detailed trie access metrics from insertion time (#19316

)

* core: split out detailed trie access metrics from insertion time

* cmd, core, metrics: support expensive optional metrics

cmd/geth/main.go

@@ -137,7 +137,6 @@ var (
 		utils.RPCCORSDomainFlag,
 		utils.RPCVirtualHostsFlag,
 		utils.EthStatsURLFlag,
-		utils.MetricsEnabledFlag,
 		utils.FakePoWFlag,
 		utils.NoCompactionFlag,
 		utils.GpoBlocksFlag,
@@ -174,6 +173,8 @@ var (
 	}
 
 	metricsFlags = []cli.Flag{
+		utils.MetricsEnabledFlag,
+		utils.MetricsEnabledExpensiveFlag,
 		utils.MetricsEnableInfluxDBFlag,
 		utils.MetricsInfluxDBEndpointFlag,
 		utils.MetricsInfluxDBDatabaseFlag,

cmd/geth/usage.go

@@ -225,16 +225,8 @@ var AppHelpFlagGroups = []flagGroup{
 		}, debug.Flags...),
 	},
 	{
-		Name: "METRICS AND STATS",
-		Flags: []cli.Flag{
-			utils.MetricsEnabledFlag,
-			utils.MetricsEnableInfluxDBFlag,
-			utils.MetricsInfluxDBEndpointFlag,
-			utils.MetricsInfluxDBDatabaseFlag,
-			utils.MetricsInfluxDBUsernameFlag,
-			utils.MetricsInfluxDBPasswordFlag,
-			utils.MetricsInfluxDBTagsFlag,
-		},
+		Name:  "METRICS AND STATS",
+		Flags: metricsFlags,
 	},
 	{
 		Name:  "WHISPER (EXPERIMENTAL)",

cmd/utils/flags.go

@@ -226,7 +226,7 @@ var (
 	}
 	// Dashboard settings
 	DashboardEnabledFlag = cli.BoolFlag{
-		Name:  metrics.DashboardEnabledFlag,
+		Name:  "dashboard",
 		Usage: "Enable the dashboard",
 	}
 	DashboardAddrFlag = cli.StringFlag{
@@ -644,9 +644,13 @@ var (
 
 	// Metrics flags
 	MetricsEnabledFlag = cli.BoolFlag{
-		Name:  metrics.MetricsEnabledFlag,
+		Name:  "metrics",
 		Usage: "Enable metrics collection and reporting",
 	}
+	MetricsEnabledExpensiveFlag = cli.BoolFlag{
+		Name:  "metrics.expensive",
+		Usage: "Enable expensive metrics collection and reporting",
+	}
 	MetricsEnableInfluxDBFlag = cli.BoolFlag{
 		Name:  "metrics.influxdb",
 		Usage: "Enable metrics export/push to an external InfluxDB database",

core/blockchain.go

@@ -47,6 +47,16 @@ import (
 )
 
 var (
+	accountReadTimer   = metrics.NewRegisteredTimer("chain/account/reads", nil)
+	accountHashTimer   = metrics.NewRegisteredTimer("chain/account/hashes", nil)
+	accountUpdateTimer = metrics.NewRegisteredTimer("chain/account/updates", nil)
+	accountCommitTimer = metrics.NewRegisteredTimer("chain/account/commits", nil)
+
+	storageReadTimer   = metrics.NewRegisteredTimer("chain/storage/reads", nil)
+	storageHashTimer   = metrics.NewRegisteredTimer("chain/storage/hashes", nil)
+	storageUpdateTimer = metrics.NewRegisteredTimer("chain/storage/updates", nil)
+	storageCommitTimer = metrics.NewRegisteredTimer("chain/storage/commits", nil)
+
 	blockInsertTimer     = metrics.NewRegisteredTimer("chain/inserts", nil)
 	blockValidationTimer = metrics.NewRegisteredTimer("chain/validation", nil)
 	blockExecutionTimer  = metrics.NewRegisteredTimer("chain/execution", nil)
@@ -1249,10 +1259,26 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals bool) (int, []
 		if err != nil {
 			return it.index, events, coalescedLogs, err
 		}
+
+		// Update the metrics subsystem with all the measurements
+		accountReadTimer.Update(state.AccountReads)
+		accountHashTimer.Update(state.AccountHashes)
+		accountUpdateTimer.Update(state.AccountUpdates)
+		accountCommitTimer.Update(state.AccountCommits)
+
+		storageReadTimer.Update(state.StorageReads)
+		storageHashTimer.Update(state.StorageHashes)
+		storageUpdateTimer.Update(state.StorageUpdates)
+		storageCommitTimer.Update(state.StorageCommits)
+
+		trieAccess := state.AccountReads + state.AccountHashes + state.AccountUpdates + state.AccountCommits
+		trieAccess += state.StorageReads + state.StorageHashes + state.StorageUpdates + state.StorageCommits
+
 		blockInsertTimer.UpdateSince(start)
-		blockExecutionTimer.Update(t1.Sub(t0))
+		blockExecutionTimer.Update(t1.Sub(t0) - trieAccess)
 		blockValidationTimer.Update(t2.Sub(t1))
 		blockWriteTimer.Update(t3.Sub(t2))
+
 		switch status {
 		case CanonStatTy:
 			log.Debug("Inserted new block", "number", block.Number(), "hash", block.Hash(),
@@ -1274,7 +1300,6 @@ func (bc *BlockChain) insertChain(chain types.Blocks, verifySeals bool) (int, []
 				"root", block.Root())
 			events = append(events, ChainSideEvent{block})
 		}
-		blockInsertTimer.UpdateSince(start)
 		stats.processed++
 		stats.usedGas += usedGas
 

core/state/state_object.go

@@ -21,9 +21,11 @@ import (
 	"fmt"
 	"io"
 	"math/big"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/rlp"
 )
 
@@ -177,6 +179,10 @@ func (self *stateObject) GetCommittedState(db Database, key common.Hash) common.
 	if cached {
 		return value
 	}
+	// Track the amount of time wasted on reading the storge trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { self.db.StorageReads += time.Since(start) }(time.Now())
+	}
 	// Otherwise load the value from the database
 	enc, err := self.getTrie(db).TryGet(key[:])
 	if err != nil {
@@ -216,6 +222,11 @@ func (self *stateObject) setState(key, value common.Hash) {
 
 // updateTrie writes cached storage modifications into the object's storage trie.
 func (self *stateObject) updateTrie(db Database) Trie {
+	// Track the amount of time wasted on updating the storge trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { self.db.StorageUpdates += time.Since(start) }(time.Now())
+	}
+	// Update all the dirty slots in the trie
 	tr := self.getTrie(db)
 	for key, value := range self.dirtyStorage {
 		delete(self.dirtyStorage, key)
@@ -240,6 +251,11 @@ func (self *stateObject) updateTrie(db Database) Trie {
 // UpdateRoot sets the trie root to the current root hash of
 func (self *stateObject) updateRoot(db Database) {
 	self.updateTrie(db)
+
+	// Track the amount of time wasted on hashing the storge trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { self.db.StorageHashes += time.Since(start) }(time.Now())
+	}
 	self.data.Root = self.trie.Hash()
 }
 
@@ -250,6 +266,10 @@ func (self *stateObject) CommitTrie(db Database) error {
 	if self.dbErr != nil {
 		return self.dbErr
 	}
+	// Track the amount of time wasted on committing the storge trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { self.db.StorageCommits += time.Since(start) }(time.Now())
+	}
 	root, err := self.trie.Commit(nil)
 	if err == nil {
 		self.data.Root = root

core/state/statedb.go

@@ -22,11 +22,13 @@ import (
 	"fmt"
 	"math/big"
 	"sort"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/metrics"
 	"github.com/ethereum/go-ethereum/rlp"
 	"github.com/ethereum/go-ethereum/trie"
 )
@@ -86,6 +88,16 @@ type StateDB struct {
 	journal        *journal
 	validRevisions []revision
 	nextRevisionId int
+
+	// Measurements gathered during execution for debugging purposes
+	AccountReads   time.Duration
+	AccountHashes  time.Duration
+	AccountUpdates time.Duration
+	AccountCommits time.Duration
+	StorageReads   time.Duration
+	StorageHashes  time.Duration
+	StorageUpdates time.Duration
+	StorageCommits time.Duration
 }
 
 // Create a new state from a given trie.
@@ -386,46 +398,61 @@ func (self *StateDB) Suicide(addr common.Address) bool {
 //
 
 // updateStateObject writes the given object to the trie.
-func (self *StateDB) updateStateObject(stateObject *stateObject) {
+func (s *StateDB) updateStateObject(stateObject *stateObject) {
+	// Track the amount of time wasted on updating the account from the trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { s.AccountUpdates += time.Since(start) }(time.Now())
+	}
+	// Encode the account and update the account trie
 	addr := stateObject.Address()
+
 	data, err := rlp.EncodeToBytes(stateObject)
 	if err != nil {
 		panic(fmt.Errorf("can't encode object at %x: %v", addr[:], err))
 	}
-	self.setError(self.trie.TryUpdate(addr[:], data))
+	s.setError(s.trie.TryUpdate(addr[:], data))
 }
 
 // deleteStateObject removes the given object from the state trie.
-func (self *StateDB) deleteStateObject(stateObject *stateObject) {
+func (s *StateDB) deleteStateObject(stateObject *stateObject) {
+	// Track the amount of time wasted on deleting the account from the trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { s.AccountUpdates += time.Since(start) }(time.Now())
+	}
+	// Delete the account from the trie
 	stateObject.deleted = true
+
 	addr := stateObject.Address()
-	self.setError(self.trie.TryDelete(addr[:]))
+	s.setError(s.trie.TryDelete(addr[:]))
 }
 
 // Retrieve a state object given by the address. Returns nil if not found.
-func (self *StateDB) getStateObject(addr common.Address) (stateObject *stateObject) {
-	// Prefer 'live' objects.
-	if obj := self.stateObjects[addr]; obj != nil {
+func (s *StateDB) getStateObject(addr common.Address) (stateObject *stateObject) {
+	// Prefer live objects
+	if obj := s.stateObjects[addr]; obj != nil {
 		if obj.deleted {
 			return nil
 		}
 		return obj
 	}
-
-	// Load the object from the database.
-	enc, err := self.trie.TryGet(addr[:])
+	// Track the amount of time wasted on loading the object from the database
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { s.AccountReads += time.Since(start) }(time.Now())
+	}
+	// Load the object from the database
+	enc, err := s.trie.TryGet(addr[:])
 	if len(enc) == 0 {
-		self.setError(err)
+		s.setError(err)
 		return nil
 	}
 	var data Account
 	if err := rlp.DecodeBytes(enc, &data); err != nil {
 		log.Error("Failed to decode state object", "addr", addr, "err", err)
 		return nil
 	}
-	// Insert into the live set.
-	obj := newObject(self, addr, data)
-	self.setStateObject(obj)
+	// Insert into the live set
+	obj := newObject(s, addr, data)
+	s.setStateObject(obj)
 	return obj
 }
 
@@ -600,6 +627,11 @@ func (s *StateDB) Finalise(deleteEmptyObjects bool) {
 // goes into transaction receipts.
 func (s *StateDB) IntermediateRoot(deleteEmptyObjects bool) common.Hash {
 	s.Finalise(deleteEmptyObjects)
+
+	// Track the amount of time wasted on hashing the account trie
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { s.AccountHashes += time.Since(start) }(time.Now())
+	}
 	return s.trie.Hash()
 }
 
@@ -624,7 +656,7 @@ func (s *StateDB) Commit(deleteEmptyObjects bool) (root common.Hash, err error)
 	for addr := range s.journal.dirties {
 		s.stateObjectsDirty[addr] = struct{}{}
 	}
-	// Commit objects to the trie.
+	// Commit objects to the trie, measuring the elapsed time
 	for addr, stateObject := range s.stateObjects {
 		_, isDirty := s.stateObjectsDirty[addr]
 		switch {
@@ -647,7 +679,10 @@ func (s *StateDB) Commit(deleteEmptyObjects bool) (root common.Hash, err error)
 		}
 		delete(s.stateObjectsDirty, addr)
 	}
-	// Write trie changes.
+	// Write the account trie changes, measuing the amount of wasted time
+	if metrics.EnabledExpensive {
+		defer func(start time.Time) { s.AccountCommits += time.Since(start) }(time.Now())
+	}
 	root, err = s.trie.Commit(func(leaf []byte, parent common.Hash) error {
 		var account Account
 		if err := rlp.DecodeBytes(leaf, &account); err != nil {

metrics/metrics.go

@@ -15,24 +15,41 @@ import (
 )
 
 // Enabled is checked by the constructor functions for all of the
-// standard metrics.  If it is true, the metric returned is a stub.
+// standard metrics. If it is true, the metric returned is a stub.
 //
 // This global kill-switch helps quantify the observer effect and makes
 // for less cluttered pprof profiles.
 var Enabled = false
 
-// MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
-const MetricsEnabledFlag = "metrics"
-const DashboardEnabledFlag = "dashboard"
+// EnabledExpensive is a soft-flag meant for external packages to check if costly
+// metrics gathering is allowed or not. The goal is to separate standard metrics
+// for health monitoring and debug metrics that might impact runtime performance.
+var EnabledExpensive = false
+
+// enablerFlags is the CLI flag names to use to enable metrics collections.
+var enablerFlags = []string{"metrics", "dashboard"}
+
+// expensiveEnablerFlags is the CLI flag names to use to enable metrics collections.
+var expensiveEnablerFlags = []string{"metrics.expensive"}
 
 // Init enables or disables the metrics system. Since we need this to run before
 // any other code gets to create meters and timers, we'll actually do an ugly hack
 // and peek into the command line args for the metrics flag.
 func init() {
 	for _, arg := range os.Args {
-		if flag := strings.TrimLeft(arg, "-"); flag == MetricsEnabledFlag || flag == DashboardEnabledFlag {
-			log.Info("Enabling metrics collection")
-			Enabled = true
+		flag := strings.TrimLeft(arg, "-")
+
+		for _, enabler := range enablerFlags {
+			if !Enabled && flag == enabler {
+				log.Info("Enabling metrics collection")
+				Enabled = true
+			}
+		}
+		for _, enabler := range expensiveEnablerFlags {
+			if !Enabled && flag == enabler {
+				log.Info("Enabling expensive metrics collection")
+				EnabledExpensive = true
+			}
 		}
 	}
 }