testing master_Addr flag

pytorch_lightning/models/trainer.py

@@ -384,8 +384,8 @@ class Trainer(TrainerIO):
         :return:
         """
         # on one node we use localhost
-        if nb_gpu_nodes == 1:
-            return '127.0.0.1'
+        # if nb_gpu_nodes == 1:
+        #     return '127.0.0.1'
 
         # where to store ip_table
         ip_file_dir = os.path.join(self.cluster.log_path, 'ip_tables')
@@ -409,6 +409,9 @@ class Trainer(TrainerIO):
 
             return root_ip
         else:
+            # sleep 10 seconds first to give file chance to write
+            sleep(10)
+
             # wait up to 120 seconds until proc 0 writes
             # once written, read proc 0's address and use it to configure server
             for i in range(0, 120):