/
performance.go
185 lines (154 loc) · 3.84 KB
/
performance.go
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package main
import (
"flag"
"fmt"
"github.com/robaho/leveldb"
"log"
"math/rand"
"os"
"runtime"
"runtime/pprof"
"time"
)
const nr = 10000000
var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to `file`")
func main() {
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal("could not create CPU profile: ", err)
}
defer f.Close()
if err := pprof.StartCPUProfile(f); err != nil {
log.Fatal("could not start CPU profile: ", err)
}
defer pprof.StopCPUProfile()
}
runtime.GOMAXPROCS(4)
testInsert(false)
testRead()
testInsert(true)
testRead()
testInsertBatch()
testRead()
db, err := leveldb.Open("test/mydb", leveldb.Options{})
if err != nil {
panic(err)
}
db.Put([]byte(fmt.Sprintf("mykey%7d", 0)), []byte(fmt.Sprint("myvalue", 0)))
fmt.Println("closing with 1 segment")
db.CloseWithMerge(1)
testRead()
}
func testInsert(noflush bool) {
leveldb.Remove("test/mydb")
db, err := leveldb.Open("test/mydb", leveldb.Options{CreateIfNeeded: true, DisableWriteFlush: noflush})
if err != nil {
log.Fatal("unable to create database", err)
}
start := time.Now()
for i := 0; i < nr; i++ {
db.Put([]byte(fmt.Sprintf("mykey%7d", i)), []byte(fmt.Sprint("myvalue", i)))
}
end := time.Now()
duration := end.Sub(start).Microseconds()
s := ""
if noflush {
s = "NoFlush"
}
fmt.Println("insert", s, "time ", nr, "records = ", duration/1000, "ms, usec per op ", float64(duration)/nr)
start = time.Now()
err = db.Close()
end = time.Now()
duration = end.Sub(start).Microseconds()
fmt.Println("close time ", duration/1000.0, "ms")
if err != nil {
panic(err)
}
}
func testInsertBatch() {
err := leveldb.Remove("test/mydb")
db, err := leveldb.Open("test/mydb", leveldb.Options{CreateIfNeeded: true})
if err != nil {
log.Fatal("unable to create database", err)
}
start := time.Now()
if err != nil {
panic(err)
}
for i := 0; i < nr; {
b := leveldb.WriteBatch{}
for j := 0; j < 1000; j++ {
b.Put([]byte(fmt.Sprintf("mykey%7d", i+j)), []byte(fmt.Sprint("myvalue", i+j)))
}
err = db.Write(b)
if err != nil {
log.Fatal("unable to Write batch", err)
}
i += 1000
}
end := time.Now()
duration := end.Sub(start).Microseconds()
fmt.Println("insert batch time ", nr, "records = ", duration/1000, "ms, usec per op ", float64(duration)/nr)
start = time.Now()
err = db.Close()
end = time.Now()
duration = end.Sub(start).Microseconds()
fmt.Println("close time ", (duration)/1000, "ms")
if err != nil {
panic(err)
}
}
func testRead() {
db, err := leveldb.Open("test/mydb", leveldb.Options{})
if err != nil {
log.Fatal("unable to open database", err)
}
fmt.Println("number of segments", db.Stats().NumberOfSegments)
start := time.Now()
itr, err := db.Lookup(nil, nil)
count := 0
for {
_, _, err = itr.Next()
if err != nil {
break
}
count++
}
if count != nr {
log.Fatal("incorrect count != ", nr, ", count is ", count)
}
end := time.Now()
duration := end.Sub(start).Microseconds()
fmt.Println("scan time ", duration/1000, "ms, usec per op ", float64(duration)/nr)
start = time.Now()
itr, err = db.Lookup([]byte("mykey5000000"), []byte("mykey5099999"))
count = 0
for {
_, _, err = itr.Next()
if err != nil {
break
}
count++
}
if count != nr/100 {
log.Fatal("incorrect count, count is ", count)
}
end = time.Now()
duration = end.Sub(start).Microseconds()
fmt.Println("scan time 1% ", duration/1000, "ms, usec per op ", float64(duration)/(nr/100))
r := rand.New(rand.NewSource(time.Now().UnixNano()))
start = time.Now()
for i := 0; i < nr/10; i++ {
index := r.Intn(nr / 10)
_, err := db.Get([]byte(fmt.Sprintf("mykey%7d", index)))
if err != nil {
panic(err)
}
}
end = time.Now()
duration = end.Sub(start).Microseconds()
fmt.Println("random access time ", float64(duration)/(nr/10), "us per get")
db.Close()
}