diff --git a/src/ga.go b/src/ga.go
index 515a938..a83c179 100644
--- a/src/ga.go
+++ b/src/ga.go
@@ -121,7 +121,7 @@ type Node struct {
 	//Status     []GPUStatus `json:"status"`
 }
 
-type Task struct {
+type Task3 struct {
 	Name      string `json:"name"`
 	Image     string `json:"image"`
 	Cmd       string `json:"cmd"`
@@ -189,13 +189,13 @@ func fastBestFit(nodes []Node, tasks []Task) Allocation {
 				minCost = cost
 				nodeID = node.ClientID
 			}
-			fmt.Println(cost)
+			//fmt.Println(cost)
 		}
 		if nodeID == "" {
 			allocation.Flags["valid"] = false
 			break
 		} else {
-			fmt.Println(task, nodeID, allocation.TasksOnNode, minCost)
+			//fmt.Println(task, nodeID, allocation.TasksOnNode, minCost)
 			allocation.TasksOnNode[nodeID] = append(allocation.TasksOnNode[nodeID], task)
 			eva.add(nodesMap[nodeID], task)
 		}
@@ -387,7 +387,7 @@ func (X Allocation) Mutate(rng *rand.Rand) {
 	}
 	//fmt.Println("After", X)
 
-	/* exchange tasks */
+	/* move tasks */
 	if !X.Flags["valid"] {
 		//fmt.Println("Invalid allocation")
 		return
@@ -397,10 +397,20 @@ func (X Allocation) Mutate(rng *rand.Rand) {
 		nodeIDs = append(nodeIDs, nodeID)
 	}
 	randIndex1 := rng.Intn(len(nodeIDs))
-	randIndex2 := rng.Intn(len(nodeIDs))
 	nodeID1 := nodeIDs[randIndex1]
-	nodeID2 := nodeIDs[randIndex2]
-	X.TasksOnNode[nodeID1], X.TasksOnNode[nodeID2] = X.TasksOnNode[nodeID2], X.TasksOnNode[nodeID1]
+	if tasks, ok := X.TasksOnNode[nodeID1]; ok && len(tasks) > 0 {
+		idx := rng.Intn(len(tasks))
+		task := tasks[idx]
+		copy(X.TasksOnNode[nodeID1][idx:], X.TasksOnNode[nodeID1][idx+1:])
+		X.TasksOnNode[nodeID1] = X.TasksOnNode[nodeID1][:len(X.TasksOnNode[nodeID1])-1]
+
+		if nodeID, ok := firstFit(X, task); ok {
+			X.TasksOnNode[nodeID] = append(X.TasksOnNode[nodeID], task)
+		} else {
+			X.Flags["valid"] = false
+		}
+	}
+
 }
 
 // Crossover a Vector with another Vector by applying uniform crossover.
@@ -531,7 +541,7 @@ func VectorFactory(rng *rand.Rand) eaopt.Genome {
 	}
 
 	t := rng.Int() % 10
-	if t == 0 {
+	if t == -1 {
 		/* best-fit */
 		ts := time.Now()
 
@@ -572,7 +582,7 @@ func VectorFactory(rng *rand.Rand) eaopt.Genome {
 	return allocation
 }
 
-func main() {
+func main3() {
 	numTask := 5
 
 	nodesMap = map[string]Node{}
@@ -583,12 +593,12 @@ func main() {
 		node.NumCPU = 24
 		node.MemTotal = 188
 		node.TotalBW = 100
-		node.numberGPU = rand.Intn(8) + 1
+		node.numberGPU = rand.Intn(3) + 1
 		nodesMap[strconv.Itoa(i)] = node
 	}
 	for i := 0; i < numTask; i++ {
 		isPS := false
-		if i%5 == 0 {
+		if i>= 3 {
 			isPS = true
 		}
 		task := Task{Name: strconv.Itoa(i), IsPS: isPS}
@@ -608,7 +618,7 @@ func main() {
 		tasks = append(tasks, task)
 	}
 	s := time.Now()
-	fmt.Println(fastBestFit(nodes, tasks))
+	allocation := fastBestFit(nodes, tasks)
 	fmt.Println(time.Since(s))
 
 	// Instantiate a GA with a GAConfig
@@ -635,8 +645,8 @@ func main() {
 
 	ga.EarlyStop = func(ga *eaopt.GA) bool {
 		gap := math.Abs(ga.HallOfFame[0].Fitness - bestFitness)
-		if gap <= 0.000001 {
-			if count >= 30 || time.Since(ts) > time.Second*30 {
+		if gap <= 0.000001 || ga.HallOfFame[0].Fitness >= bestFitness {
+			if count >= 50 || time.Since(ts) > time.Second*30 {
 				fmt.Println("Early Stop")
 				return true
 			} else {
@@ -652,10 +662,12 @@ func main() {
 	// Find the minimum
 	err = ga.Minimize(VectorFactory)
 	fmt.Println(time.Since(ts))
-	//fmt.Println(ga.HallOfFame[0].Genome.(Allocation).TasksOnNode)
+	fmt.Println(ga.HallOfFame[0].Genome.(Allocation).TasksOnNode)
 	//fmt.Println(ga.HallOfFame[0].Genome.(Allocation).Nodes)
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
+
+	fmt.Println(allocation)
 }
diff --git a/src/job_manager.go b/src/job_manager.go
index d864523..efc554f 100644
--- a/src/job_manager.go
+++ b/src/job_manager.go
@@ -154,62 +154,7 @@ func (jm *JobManager) start() {
 
 	/* monitor job execution */
 	for {
-		res := jm.status()
-		flag := false
-		onlyPS := true
-		for i := range res.Status {
-			if res.Status[i].Status == "ready" {
-				log.Debug(jm.job.Name, "-", i, " is ready to run")
-				flag = true
-				if !jm.job.Tasks[i].IsPS {
-					onlyPS = false
-				}
-			} else if res.Status[i].Status == "running" {
-				log.Debug(jm.job.Name, "-", i, " is running")
-				flag = true
-				if !jm.job.Tasks[i].IsPS {
-					onlyPS = false
-				}
-				InstanceJobHistoryLogger().submitTaskStatus(jm.job.Name, res.Status[i])
-			} else {
-				log.Info(jm.job.Name, "-", i, " ", res.Status[i].Status)
-				if exitCode, ok := res.Status[i].State["ExitCode"].(float64); ok && !jm.job.Tasks[i].IsPS {
-					if exitCode != 0 && !jm.killedFlag {
-						log.Warn(jm.job.Name+"-"+jm.job.Tasks[i].Name+" exited unexpected, exitCode=", exitCode)
-						jm.killedFlag = true
-						jm.scheduler.UpdateProgress(jm.job, Failed)
-					}
-				}
-
-				/* remove exited containers */
-				//v := url.Values{}
-				//v.Set("id", res.Status[i].Id)
-				//
-				//_, err := doRequest("POST", "http://"+res.Status[i].Node+":8000/remove", strings.NewReader(v.Encode()), "application/x-www-form-urlencoded", "")
-				//if err != nil {
-				//	log.Warn(err.Error())
-				//	continue
-				//}
-
-				/* return resource */
-				if jm.resources[i].ClientID != "null" {
-					jm.scheduler.ReleaseResource(jm.job, jm.resources[i])
-					log.Info("return resource ", jm.resources[i].ClientID)
-					jm.resources[i].ClientID = "null"
-
-					for _, t := range jm.resources[i].Status {
-						jm.scheduler.Detach(t.UUID, jm.job)
-					}
-
-					InstanceJobHistoryLogger().submitTaskStatus(jm.job.Name, res.Status[i])
-				}
-			}
-		}
-		if flag && onlyPS {
-			jm.stop()
-			log.Info("Only PS is running, stop ", jm.job.Name)
-			jm.killedFlag = false
-		}
+		flag := jm.checkStatus()
 		if !flag {
 			break
 		}
@@ -225,6 +170,66 @@ func (jm *JobManager) start() {
 	log.Info("JobMaster exited ", jm.job.Name)
 }
 
+func (jm *JobManager) checkStatus() bool {
+	res := jm.status()
+	flag := false
+	onlyPS := true
+	for i := range res.Status {
+		if res.Status[i].Status == "ready" {
+			log.Debug(jm.job.Name, "-", i, " is ready to run")
+			flag = true
+			if !jm.job.Tasks[i].IsPS {
+				onlyPS = false
+			}
+		} else if res.Status[i].Status == "running" {
+			log.Debug(jm.job.Name, "-", i, " is running")
+			flag = true
+			if !jm.job.Tasks[i].IsPS {
+				onlyPS = false
+			}
+			InstanceJobHistoryLogger().submitTaskStatus(jm.job.Name, res.Status[i])
+		} else {
+			log.Info(jm.job.Name, "-", i, " ", res.Status[i].Status)
+			if exitCode, ok := res.Status[i].State["ExitCode"].(float64); ok && !jm.job.Tasks[i].IsPS {
+				if exitCode != 0 && !jm.killedFlag {
+					log.Warn(jm.job.Name+"-"+jm.job.Tasks[i].Name+" exited unexpected, exitCode=", exitCode)
+					jm.killedFlag = true
+					jm.scheduler.UpdateProgress(jm.job, Failed)
+				}
+			}
+
+			/* remove exited containers */
+			//v := url.Values{}
+			//v.Set("id", res.Status[i].Id)
+			//
+			//_, err := doRequest("POST", "http://"+res.Status[i].Node+":8000/remove", strings.NewReader(v.Encode()), "application/x-www-form-urlencoded", "")
+			//if err != nil {
+			//	log.Warn(err.Error())
+			//	continue
+			//}
+
+			/* return resource */
+			if jm.resources[i].ClientID != "null" {
+				jm.scheduler.ReleaseResource(jm.job, jm.resources[i])
+				log.Info("return resource ", jm.resources[i].ClientID)
+				jm.resources[i].ClientID = "null"
+
+				for _, t := range jm.resources[i].Status {
+					jm.scheduler.Detach(t.UUID, jm.job)
+				}
+
+				InstanceJobHistoryLogger().submitTaskStatus(jm.job.Name, res.Status[i])
+			}
+		}
+	}
+	if flag && onlyPS {
+		jm.stop()
+		log.Info("Only PS is running, stop ", jm.job.Name)
+		jm.killedFlag = false
+	}
+	return flag
+}
+
 func (jm *JobManager) logs(taskName string) MsgLog {
 	spider := Spider{}
 	spider.Method = "GET"
diff --git a/src/resource_pool.go b/src/resource_pool.go
index 8ea3448..cd74d6a 100644
--- a/src/resource_pool.go
+++ b/src/resource_pool.go
@@ -38,6 +38,9 @@ type ResourcePool struct {
 
 	TotalGPU   int
 	TotalGPUMu sync.Mutex
+
+	subscriptions   map[string]map[string]int
+	subscriptionsMu sync.Mutex
 }
 
 func (pool *ResourcePool) start() {
@@ -50,6 +53,8 @@ func (pool *ResourcePool) start() {
 	pool.bindings = map[string]map[string]int{}
 	pool.utils = map[string][]UtilGPUTimeSeries{}
 
+	pool.subscriptions = map[string]map[string]int{}
+
 	pool.TotalGPU = 0
 
 	/* init pools */
@@ -233,6 +238,8 @@ func (pool *ResourcePool) update(node NodeStatus) {
 
 	/* init bindings */
 	go func(node NodeStatus) {
+		pool.subscriptionsMu.Lock()
+		defer pool.subscriptionsMu.Unlock()
 		pool.bindingsMu.Lock()
 		defer pool.bindingsMu.Unlock()
 		for _, gpu := range node.Status {
@@ -242,6 +249,12 @@ func (pool *ResourcePool) update(node NodeStatus) {
 						UtilGPUTimeSeries{Time: (int)(time.Now().Unix()), Util: gpu.UtilizationGPU})
 				}
 			}
+
+			if _, ok := pool.subscriptions[gpu.UUID]; ok {
+				for jobName := range pool.subscriptions[gpu.UUID] {
+					scheduler.QueryState(jobName)
+				}
+			}
 		}
 		pool.heartBeatMu.Lock()
 		pool.heartBeat[node.ClientID] = time.Now()
@@ -438,8 +451,16 @@ func (pool *ResourcePool) releaseNetwork(network string) {
 }
 
 func (pool *ResourcePool) attach(GPU string, job string) {
+	pool.subscriptionsMu.Lock()
+	defer pool.subscriptionsMu.Unlock()
 	pool.bindingsMu.Lock()
 	defer pool.bindingsMu.Unlock()
+
+	if _, ok := pool.subscriptions[GPU]; !ok {
+		pool.subscriptions[GPU] = map[string]int{}
+	}
+	pool.subscriptions[GPU][job] = int(time.Now().Unix())
+
 	if _, ok := pool.bindings[GPU]; !ok {
 		pool.bindings[GPU] = map[string]int{}
 	}
@@ -455,8 +476,15 @@ func (pool *ResourcePool) attach(GPU string, job string) {
 }
 
 func (pool *ResourcePool) detach(GPU string, job Job) {
+	pool.subscriptionsMu.Lock()
+	defer pool.subscriptionsMu.Unlock()
 	pool.bindingsMu.Lock()
 	defer pool.bindingsMu.Unlock()
+
+	if _, ok := pool.subscriptions[GPU]; ok {
+		delete(pool.subscriptions[GPU], job.Name)
+	}
+
 	if _, ok := pool.bindings[GPU]; ok {
 		if _, ok2 := pool.utils[GPU]; ok2 {
 			if len(pool.bindings[GPU]) == 1 && job.Status != Failed && job.Status != Stopped {