diff --git a/src/master/taskmgr.py b/src/master/taskmgr.py
index b5e7936..e5993e9 100644
--- a/src/master/taskmgr.py
+++ b/src/master/taskmgr.py
@@ -344,7 +344,7 @@ class TaskMgr(threading.Thread):
             vnode_info.vnode.network.CopyFrom(networkinfo)
 
             placed_workers.append(sub_task.worker)
-            [success,msg] = self.start_vnode(sub_task)
+            [success, msg] = self.start_vnode(sub_task)
             if not success:
                 sub_task.waiting_for_retry()
                 sub_task.worker = None
@@ -361,7 +361,8 @@ class TaskMgr(threading.Thread):
                 continue
             task_info.token = ''.join(random.sample(string.ascii_letters + string.digits, 8))
 
-            if self.start_task(sub_task):
+            [success, msg] = self.start_task(sub_task)
+            if success:
                 sub_task.status = RUNNING
             else:
                 sub_task.waiting_for_retry()
@@ -373,6 +374,7 @@ class TaskMgr(threading.Thread):
     def clear_sub_task(self, sub_task):
         if sub_task.task_started:
             self.stop_task(sub_task)
+            #pass
         if sub_task.vnode_started:
             self.stop_vnode(sub_task)
             #pass
@@ -458,7 +460,7 @@ class TaskMgr(threading.Thread):
 
         return None, None
 
-    def find_proper_workers(self, sub_task_list):
+    def find_proper_workers(self, sub_task_list, all_res=False):
         nodes = self.get_all_nodes()
         if nodes is None or len(nodes) == 0:
             self.logger.warning('[task_scheduler] running nodes not found')
@@ -478,7 +480,7 @@ class TaskMgr(threading.Thread):
             for worker_ip, worker_info in nodes:
                 #logger.info(worker_info)
                 #logger.info(self.get_cpu_usage(worker_ip))
-                if needs.cpu + self.get_cpu_usage(worker_ip) > worker_info['cpu']:
+                if needs.cpu + (not all_res) * self.get_cpu_usage(worker_ip) > worker_info['cpu']:
                     continue
                 elif needs.memory > worker_info['memory']:
                     continue
@@ -487,7 +489,7 @@ class TaskMgr(threading.Thread):
                 # try not to assign non-gpu task to a worker with gpu
                 #if needs['gpu'] == 0 and worker_info['gpu'] > 0:
                     #continue
-                elif needs.gpu + self.get_gpu_usage(worker_ip) > worker_info['gpu']:
+                elif needs.gpu + (not all_res) * self.get_gpu_usage(worker_ip) > worker_info['gpu']:
                     continue
                 else:
                     worker_info['cpu'] -= needs.cpu
@@ -548,6 +550,7 @@ class TaskMgr(threading.Thread):
     def add_task(self, username, taskid, json_task, task_priority=1):
         # decode json string to object defined in grpc
         self.logger.info('[taskmgr add_task] receive task %s' % taskid)
+
         image_dict = {
             "private": Image.PRIVATE,
             "base": Image.BASE,
@@ -596,7 +599,24 @@ class TaskMgr(threading.Thread):
                 # if in traditional mode, commands will be executed in all vnodes
                 ) if (not 'atSameTime' in json_task.keys() or json_task['runon'] == 'all' or vnode_index == 0) else None
             } for vnode_index in range(int(json_task['vnodeCount']))])
+
+        if task.at_same_time:
+            workers = self.find_proper_workers(task.subtask_list, all_res=True)
+            if len(workers) == 0:
+                task.status = FAILED
+                # tell jobmgr
+                self.jobmgr.report(username,taskid,"failed","Resources needs exceed limits")
+                return False
+        else:
+            for sub_task in task.subtask_list:
+                workers = self.find_proper_workers([sub_task], all_res=True)
+                if len(workers) == 0:
+                    task.status = FAILED
+                    # tell jobmgr
+                    self.jobmgr.report(username,taskid,"failed","Resources needs exceed limits")
+                    return False
         self.lazy_append_list.append(task)
+        return True
 
 
     # user: username
diff --git a/web/templates/batch/batch_create.html b/web/templates/batch/batch_create.html
index 5fc9db8..465d015 100644
--- a/web/templates/batch/batch_create.html
+++ b/web/templates/batch/batch_create.html
@@ -41,7 +41,7 @@
 
                     <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
                     <div class="form-group"><label class="col-sm-2 control-label">Job Name</label>
-                        <div class="col-sm-10"><input type="text" class="form-control" name="jobName" id="job_name"></div>
+                        <div class="col-sm-10"><input type="text" class="form-control" name="jobName" id="job_name" required></div>
                     </div>
                     <div class="hr-line-dashed"></div>
                     <br/>