diff --git a/unmaintained/repeated_vacuum/repeated_vacuum.go b/unmaintained/repeated_vacuum/repeated_vacuum.go
index c2f626f72..96d4ccdf6 100644
--- a/unmaintained/repeated_vacuum/repeated_vacuum.go
+++ b/unmaintained/repeated_vacuum/repeated_vacuum.go
@@ -6,14 +6,17 @@ import (
 	"log"
 	"math/rand"
 
+	"google.golang.org/grpc"
+
 	"github.com/chrislusf/seaweedfs/weed/operation"
 	"github.com/chrislusf/seaweedfs/weed/security"
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
 var (
-	master = flag.String("master", "127.0.0.1:9333", "the master server")
-	repeat = flag.Int("n", 5, "repeat how many times")
+	master           = flag.String("master", "127.0.0.1:9333", "the master server")
+	repeat           = flag.Int("n", 5, "repeat how many times")
+	garbageThreshold = flag.Float64("garbageThreshold", 0.3, "garbageThreshold")
 )
 
 func main() {
@@ -22,26 +25,36 @@ func main() {
 	util.LoadConfiguration("security", false)
 	grpcDialOption := security.LoadClientTLS(util.GetViper(), "grpc.client")
 
+	genFile(grpcDialOption, 0)
+
 	for i := 0; i < *repeat; i++ {
-		assignResult, err := operation.Assign(*master, grpcDialOption, &operation.VolumeAssignRequest{Count: 1})
-		if err != nil {
-			log.Fatalf("assign: %v", err)
-		}
+		// create 2 files, and delete one of them
 
-		data := make([]byte, 1024)
-		rand.Read(data)
-
-		targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
-
-		_, err = operation.UploadData(targetUrl, fmt.Sprintf("test%d", i), false, data, false, "bench/test", nil, assignResult.Auth)
-		if err != nil {
-			log.Fatalf("upload: %v", err)
-		}
+		assignResult, targetUrl := genFile(grpcDialOption, i)
 
 		util.Delete(targetUrl, string(assignResult.Auth))
 
-		util.Get(fmt.Sprintf("http://%s/vol/vacuum", *master))
+		println("vacuum", i, "threshold", *garbageThreshold)
+		util.Get(fmt.Sprintf("http://%s/vol/vacuum?garbageThreshold=%f", *master, *garbageThreshold))
 
 	}
 
 }
+
+func genFile(grpcDialOption grpc.DialOption, i int) (*operation.AssignResult, string) {
+	assignResult, err := operation.Assign(*master, grpcDialOption, &operation.VolumeAssignRequest{Count: 1})
+	if err != nil {
+		log.Fatalf("assign: %v", err)
+	}
+
+	data := make([]byte, 1024)
+	rand.Read(data)
+
+	targetUrl := fmt.Sprintf("http://%s/%s", assignResult.Url, assignResult.Fid)
+
+	_, err = operation.UploadData(targetUrl, fmt.Sprintf("test%d", i), false, data, false, "bench/test", nil, assignResult.Auth)
+	if err != nil {
+		log.Fatalf("upload: %v", err)
+	}
+	return assignResult, targetUrl
+}