volume: add option to limit compaction speed

weed/storage/volume_vacuum_test.go

@@ -5,6 +5,7 @@ import (
 	"math/rand"
 	"os"
 	"testing"
+	"time"
 
 	"github.com/chrislusf/seaweedfs/weed/storage/needle"
 	"github.com/chrislusf/seaweedfs/weed/storage/types"
@@ -72,8 +73,8 @@ func TestCompaction(t *testing.T) {
 		t.Fatalf("volume creation: %v", err)
 	}
 
-	beforeCommitFileCount := 1000
-	afterCommitFileCount := 1000
+	beforeCommitFileCount := 10000
+	afterCommitFileCount := 10000
 
 	infos := make([]*needleInfo, beforeCommitFileCount+afterCommitFileCount)
 
@@ -81,7 +82,10 @@ func TestCompaction(t *testing.T) {
 		doSomeWritesDeletes(i, v, t, infos)
 	}
 
-	v.Compact(0)
+	startTime := time.Now()
+	v.Compact(0, 1024*1024)
+	speed := float64(v.ContentSize()) / time.Now().Sub(startTime).Seconds()
+	t.Logf("compaction speed: %.2f bytes/s", speed)
 
 	for i := 1; i <= afterCommitFileCount; i++ {
 		doSomeWritesDeletes(i+beforeCommitFileCount, v, t, infos)