diff --git a/src/ga.go b/src/ga.go
index a83c179..7ba1a6e 100644
--- a/src/ga.go
+++ b/src/ga.go
@@ -583,7 +583,7 @@ func VectorFactory(rng *rand.Rand) eaopt.Genome {
 }
 
 func main3() {
-	numTask := 5
+	numTask := 20
 
 	nodesMap = map[string]Node{}
 	tasksMap = map[string]Task{}
@@ -646,7 +646,7 @@ func main3() {
 	ga.EarlyStop = func(ga *eaopt.GA) bool {
 		gap := math.Abs(ga.HallOfFame[0].Fitness - bestFitness)
 		if gap <= 0.000001 || ga.HallOfFame[0].Fitness >= bestFitness {
-			if count >= 50 || time.Since(ts) > time.Second*30 {
+			if count >= 30 || time.Since(ts) > time.Second*30 {
 				fmt.Println("Early Stop")
 				return true
 			} else {
diff --git a/src/job_manager.go b/src/job_manager.go
index 77c03ea..b79ab86 100644
--- a/src/job_manager.go
+++ b/src/job_manager.go
@@ -161,7 +161,7 @@ func (jm *JobManager) start() {
 		if !jm.isRunning {
 			break
 		}
-		time.Sleep(time.Second * 10)
+		time.Sleep(time.Second * 25)
 	}
 }
 
diff --git a/src/resource_pool.go b/src/resource_pool.go
index b7935e6..b1631f1 100644
--- a/src/resource_pool.go
+++ b/src/resource_pool.go
@@ -62,11 +62,11 @@ func (pool *ResourcePool) start() {
 	for i := 0; i < pool.poolsCount; i++ {
 		pool.pools = append(pool.pools, PoolSeg{Lock: sync.Mutex{}, IsVirtual: true, ID: i})
 	}
-	/* make non-virtual seg */
+	/* make non-virtual segs */
 	for i := 0; i < pool.poolsCount/3; i++ {
 		pool.pools[rand.Intn(pool.poolsCount)].IsVirtual = false
 	}
-	/* make working srg */
+	/* generate working segs */
 	for i := 0; i < 10; i++ {
 		pool.pools[rand.Intn(pool.poolsCount)].Nodes = map[string]*NodeStatus{}
 	}
diff --git a/src/scheduler_fair.go b/src/scheduler_fair.go
index 358992d..36a4bbd 100644
--- a/src/scheduler_fair.go
+++ b/src/scheduler_fair.go
@@ -344,9 +344,10 @@ func (scheduler *SchedulerFair) Schedule(job Job) {
 }
 
 func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []NodeStatus) NodeStatus {
-	scheduler.mu.Lock()
-	defer scheduler.mu.Unlock()
 	segID := rand.Intn(pool.poolsCount)
+	if pool.TotalGPU < 100 {
+		segID = 0
+	}
 	res := NodeStatus{}
 	start := &pool.pools[segID]
 	if start.Nodes == nil {
@@ -366,7 +367,7 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []Node
 		allocationType = 1
 		if util, valid := InstanceOfOptimizer().predictUtilGPU(job.Name); valid {
 
-			for cur := start; ; {
+			for cur := start; cur.ID < cur.Next.ID; {
 				if _, ok := locks[cur.ID]; !ok {
 					cur.Lock.Lock()
 					locks[cur.ID] = &cur.Lock
@@ -430,7 +431,7 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []Node
 	}
 	if len(candidates) == 0 && flag {
 		allocationType = 2
-		for cur := start; ; {
+		for cur := start; cur.ID < cur.Next.ID; {
 			if _, ok := locks[cur.ID]; !ok {
 				cur.Lock.Lock()
 				locks[cur.ID] = &cur.Lock
@@ -471,7 +472,7 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task, nodes []Node
 
 		if pool.TotalGPU != 0 && float64(scheduler.UsingGPU)/float64(pool.TotalGPU) >= scheduler.enablePreScheduleRatio && valid {
 			allocationType = 3
-			for cur := start; ; {
+			for cur := start; cur.ID < cur.Next.ID; {
 				if _, ok := locks[cur.ID]; !ok {
 					cur.Lock.Lock()
 					locks[cur.ID] = &cur.Lock