diff --git a/src/scheduler_fair.go b/src/scheduler_fair.go
index 120b819..218368b 100644
--- a/src/scheduler_fair.go
+++ b/src/scheduler_fair.go
@@ -187,10 +187,10 @@ func (scheduler *SchedulerFair) AcquireResource(job Job, task Task) NodeStatus {
 
 	var candidates []NodeStatus
 	/* first round, find vacant gpu */
-	for i := poolID; i < pool.poolsCount; i++ {
-		pool.poolsMu[i].Lock()
-		locks[i] = pool.poolsMu[i]
-		for _, node := range pool.pools[i] {
+	for i := 0; i < pool.poolsCount; i++ {
+		pool.poolsMu[(i+poolID)%pool.poolsCount].Lock()
+		locks[(i+poolID)%pool.poolsCount] = pool.poolsMu[(i+poolID)%pool.poolsCount]
+		for _, node := range pool.pools[(i+poolID)%pool.poolsCount] {
 			var available []GPUStatus
 			for _, status := range node.Status {
 				if status.MemoryTotal >= task.MemoryGPU && status.MemoryUsed < 10 {