Make benchmarks more realistic

lib/db/benchmark_test.go

@@ -0,0 +1,199 @@
+// Copyright (C) 2015 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package db_test
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/syncthing/syncthing/lib/db"
+	"github.com/syncthing/syncthing/lib/protocol"
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/opt"
+)
+
+var files, oneFile, firstHalf, secondHalf []protocol.FileInfo
+var fs *db.FileSet
+
+func init() {
+	for i := 0; i < 1000; i++ {
+		files = append(files, protocol.FileInfo{
+			Name:    fmt.Sprintf("file%d", i),
+			Version: protocol.Vector{{ID: myID, Value: 1000}},
+			Blocks:  genBlocks(i),
+		})
+	}
+
+	middle := len(files) / 2
+	firstHalf = files[:middle]
+	secondHalf = files[middle:]
+	oneFile = firstHalf[middle-1 : middle]
+
+	ldb, _ := tempDB()
+	fs = db.NewFileSet("test", ldb)
+	fs.Replace(remoteDevice0, files)
+	fs.Replace(protocol.LocalDeviceID, firstHalf)
+}
+
+func genBlocks(n int) []protocol.BlockInfo {
+	b := make([]protocol.BlockInfo, n)
+	for i := range b {
+		h := make([]byte, 32)
+		for j := range h {
+			h[j] = byte(i + j)
+		}
+		b[i].Size = int32(i)
+		b[i].Hash = h
+	}
+	return b
+}
+
+func tempDB() (*leveldb.DB, string) {
+	dir, err := ioutil.TempDir("", "syncthing")
+	if err != nil {
+		panic(err)
+	}
+	db, err := leveldb.OpenFile(filepath.Join(dir, "db"), &opt.Options{OpenFilesCacheCapacity: 100})
+	if err != nil {
+		panic(err)
+	}
+	return db, dir
+}
+
+func BenchmarkReplaceAll(b *testing.B) {
+	ldb, dir := tempDB()
+	defer func() {
+		ldb.Close()
+		os.RemoveAll(dir)
+	}()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m := db.NewFileSet("test", ldb)
+		m.Replace(protocol.LocalDeviceID, files)
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkUpdateOneChanged(b *testing.B) {
+	changed := make([]protocol.FileInfo, 1)
+	changed[0] = oneFile[0]
+	changed[0].Version = changed[0].Version.Update(myID)
+	changed[0].Blocks = genBlocks(len(changed[0].Blocks))
+
+	for i := 0; i < b.N; i++ {
+		if i%1 == 0 {
+			fs.Update(protocol.LocalDeviceID, changed)
+		} else {
+			fs.Update(protocol.LocalDeviceID, oneFile)
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkUpdateOneUnchanged(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		fs.Update(protocol.LocalDeviceID, oneFile)
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkNeedHalf(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithNeed(protocol.LocalDeviceID, func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(secondHalf) {
+			b.Errorf("wrong length %d != %d", count, len(secondHalf))
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkHave(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithHave(protocol.LocalDeviceID, func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(firstHalf) {
+			b.Errorf("wrong length %d != %d", count, len(firstHalf))
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkGlobal(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithGlobal(func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(files) {
+			b.Errorf("wrong length %d != %d", count, len(files))
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkNeedHalfTruncated(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithNeedTruncated(protocol.LocalDeviceID, func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(secondHalf) {
+			b.Errorf("wrong length %d != %d", count, len(secondHalf))
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkHaveTruncated(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithHaveTruncated(protocol.LocalDeviceID, func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(firstHalf) {
+			b.Errorf("wrong length %d != %d", count, len(firstHalf))
+		}
+	}
+
+	b.ReportAllocs()
+}
+
+func BenchmarkGlobalTruncated(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		count := 0
+		fs.WithGlobalTruncated(func(fi db.FileIntf) bool {
+			count++
+			return true
+		})
+		if count != len(files) {
+			b.Errorf("wrong length %d != %d", count, len(files))
+		}
+	}
+
+	b.ReportAllocs()
+}