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eth, ethdb: measure database operation latencies too

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This commit is contained in:
Péter Szilágyi
2015-06-23 18:36:08 +03:00
parent 0609fcf030
commit 803b3c4a82
2 changed files with 37 additions and 20 deletions
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39
ethdb/database.go
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@ -1,6 +1,8 @@
package ethdb
import (
"time"
"github.com/ethereum/go-ethereum/compression/rle"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
@ -17,9 +19,10 @@ type LDBDatabase struct {
fn string // filename for reporting
db *leveldb.DB // LevelDB instance
GetMeter metrics.Meter // Meter for measuring the database get request counts
PutMeter metrics.Meter // Meter for measuring the database put request counts
DelMeter metrics.Meter // Meter for measuring the database delete request counts
GetTimer metrics.Timer // Timer for measuring the database get request counts and latencies
PutTimer metrics.Timer // Timer for measuring the database put request counts and latencies
DelTimer metrics.Timer // Timer for measuring the database delete request counts and latencies
MissMeter metrics.Meter // MEter for measuring the missed database get requests
ReadMeter metrics.Meter // Meter for measuring the database get request data usage
WriteMeter metrics.Meter // Meter for measuring the database put request data usage
}
@ -48,10 +51,14 @@ func NewLDBDatabase(file string) (*LDBDatabase, error) {
// Put puts the given key / value to the queue
func (self *LDBDatabase) Put(key []byte, value []byte) error {
dat := rle.Compress(value)
if self.PutMeter != nil {
self.PutMeter.Mark(1)
// Measure the database put latency, if requested
if self.PutTimer != nil {
start := time.Now()
defer self.PutTimer.UpdateSince(start)
}
// Generate the data to write to disk, update the meter and write
dat := rle.Compress(value)
if self.WriteMeter != nil {
self.WriteMeter.Mark(int64(len(dat)))
}
@ -60,13 +67,20 @@ func (self *LDBDatabase) Put(key []byte, value []byte) error {
// Get returns the given key if it's present.
func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
// Measure the database get latency, if requested
if self.GetTimer != nil {
start := time.Now()
defer self.GetTimer.UpdateSince(start)
}
// Retrieve the key and increment the miss counter if not found
dat, err := self.db.Get(key, nil)
if err != nil {
if self.MissMeter != nil {
self.MissMeter.Mark(1)
}
return nil, err
}
if self.GetMeter != nil {
self.GetMeter.Mark(1)
}
// Otherwise update the actually retrieved amount of data
if self.ReadMeter != nil {
self.ReadMeter.Mark(int64(len(dat)))
}
@ -75,9 +89,12 @@ func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
// Delete deletes the key from the queue and database
func (self *LDBDatabase) Delete(key []byte) error {
if self.DelMeter != nil {
self.DelMeter.Mark(1)
// Measure the database delete latency, if requested
if self.DelTimer != nil {
start := time.Now()
defer self.DelTimer.UpdateSince(start)
}
// Execute the actual operation
return self.db.Delete(key, nil)
}