add memory optimize for cpu server

python/paddle_serving_server/serve.py

@@ -38,6 +38,8 @@ def parse_args():  # pylint: disable=doc-string-missing
         help="Working dir of current service")
     parser.add_argument(
         "--device", type=str, default="cpu", help="Type of device")
+    parser.add_argument(
+        "--mem_optim", type=bool, default=False, help="Memory optimize")
     return parser.parse_args()
 
 
@@ -48,6 +50,7 @@ def start_standard_model():  # pylint: disable=doc-string-missing
     port = args.port
     workdir = args.workdir
     device = args.device
+    mem_optim = args.mem_optim
 
     if model == "":
         print("You must specify your serving model")
@@ -67,6 +70,7 @@ def start_standard_model():  # pylint: disable=doc-string-missing
     server = serving.Server()
     server.set_op_sequence(op_seq_maker.get_op_sequence())
     server.set_num_threads(thread_num)
+    server.set_memory_optimize(mem_optim)
 
     server.load_model_config(model)
     server.prepare_server(workdir=workdir, port=port, device=device)