Merge branch 'pyserving' of https://github.com/barrierye/Serving into pyserving

python/paddle_serving_server/pyserver.py

@@ -14,11 +14,13 @@
 # pylint: disable=doc-string-missing
 import threading
 import multiprocessing
+import multiprocessing.queues
 import Queue
 import os
 import sys
 import paddle_serving_server
 from paddle_serving_client import MultiLangClient as Client
+from paddle_serving_client import MultiLangPredictFuture
 from concurrent import futures
 import numpy as np
 import grpc
@@ -87,6 +89,7 @@ class ChannelDataType(enum.Enum):
     CHANNEL_PBDATA = 0
     CHANNEL_FUTURE = 1
     CHANNEL_NPDATA = 2
+    ERROR = 3
 
 
 class ChannelData(object):
@@ -108,35 +111,29 @@ class ChannelData(object):
         4. ChannelData(ChannelDataType.CHANNEL_PBDATA.value, npdata, data_id)
         5. ChannelData(ChannelDataType.CHANNEL_NPDATA.value, npdata, data_id)
         6. ChannelData(ecode, error_info, data_id)
+
+        Protobufs are not pickle-able:
+        https://stackoverflow.com/questions/55344376/how-to-import-protobuf-module
         '''
         if ecode is not None:
             if data_id is None or error_info is None:
                 raise ValueError("data_id and error_info cannot be None")
-            pbdata = channel_pb2.ChannelData()
-            pbdata.ecode = ecode
-            pbdata.id = data_id
-            pbdata.error_info = error_info
+            datatype = ChannelDataType.ERROR.value
         else:
             if datatype == ChannelDataType.CHANNEL_FUTURE.value:
-                if pbdata is None:
-                    if data_id is None:
-                        raise ValueError("data_id cannot be None")
-                    pbdata = channel_pb2.ChannelData()
-                    pbdata.ecode = ChannelDataEcode.OK.value
-                    pbdata.id = data_id
+                if data_id is None:
+                    raise ValueError("data_id cannot be None")
+                ecode = ChannelDataEcode.OK.value
             elif datatype == ChannelDataType.CHANNEL_PBDATA.value:
                 if pbdata is None:
                     if data_id is None:
                         raise ValueError("data_id cannot be None")
                     pbdata = channel_pb2.ChannelData()
-                    pbdata.id = data_id
                     ecode, error_info = self._check_npdata(npdata)
-                    pbdata.ecode = ecode
-                    if pbdata.ecode != ChannelDataEcode.OK.value:
-                        pbdata.error_info = error_info
-                        logging.error(pbdata.error_info)
+                    if ecode != ChannelDataEcode.OK.value:
+                        logging.error(error_info)
                     else:
-                        for name, value in postped_data.items():
+                        for name, value in npdata.items():
                             inst = channel_pb2.Inst()
                             inst.data = value.tobytes()
                             inst.name = name
@@ -146,23 +143,18 @@ class ChannelData(object):
                             pbdata.insts.append(inst)
             elif datatype == ChannelDataType.CHANNEL_NPDATA.value:
                 ecode, error_info = self._check_npdata(npdata)
-                pbdata = channel_pb2.ChannelData()
-                pbdata.id = data_id
-                pbdata.ecode = ecode
-                if pbdata.ecode != ChannelDataEcode.OK.value:
-                    pbdata.error_info = error_info
-                    logging.error(pbdata.error_info)
+                if ecode != ChannelDataEcode.OK.value:
+                    logging.error(error_info)
             else:
                 raise ValueError("datatype not match")
-        if not isinstance(pbdata, channel_pb2.ChannelData):
-            raise TypeError(
-                "pbdata must be pyserving_channel_pb2.ChannelData type({})".
-                format(type(pbdata)))
         self.future = future
         self.pbdata = pbdata
         self.npdata = npdata
         self.datatype = datatype
         self.callback_func = callback_func
+        self.id = data_id
+        self.ecode = ecode
+        self.error_info = error_info
 
     def _check_npdata(self, npdata):
         ecode = ChannelDataEcode.OK.value
@@ -174,8 +166,8 @@ class ChannelData(object):
                         "be str, but get {}".format(type(name)))
                 break
             if not isinstance(value, np.ndarray):
-                pbdata.ecode = ChannelDataEcode.TYPE_ERROR.value
-                pbdata.error_info = log("the value of postped_data must " \
+                ecode = ChannelDataEcode.TYPE_ERROR.value
+                error_info = log("the value of postped_data must " \
                         "be np.ndarray, but get {}".format(type(value)))
                 break
         return ecode, error_info
@@ -195,16 +187,15 @@ class ChannelData(object):
         elif self.datatype == ChannelDataType.CHANNEL_NPDATA.value:
             feed = self.npdata
         else:
-            raise TypeError("Error type({}) in pbdata.type.".format(
-                self.pbdata.type))
+            raise TypeError("Error type({}) in datatype.".format(self.datatype))
         return feed
 
     def __str__(self):
-        return "type[{}], ecode[{}]".format(
-            ChannelDataType(self.datatype).name, self.pbdata.ecode)
+        return "type[{}], ecode[{}], id[{}]".format(
+            ChannelDataType(self.datatype).name, self.ecode, self.id)
 
 
-class Channel(Queue.Queue):
+class Channel(multiprocessing.queues.Queue):
     """ 
     The channel used for communication between Ops.
 
@@ -222,23 +213,30 @@ class Channel(Queue.Queue):
        and can only be called during initialization.
     """
 
-    def __init__(self, name=None, maxsize=-1, timeout=None):
-        Queue.Queue.__init__(self, maxsize=maxsize)
+    def __init__(self, manager, name=None, maxsize=0, timeout=None):
+        # https://stackoverflow.com/questions/39496554/cannot-subclass-multiprocessing-queue-in-python-3-5/
+        multiprocessing.queues.Queue.__init__(self, maxsize=maxsize)
         self._maxsize = maxsize
         self._timeout = timeout
         self.name = name
         self._stop = False
 
-        self._cv = threading.Condition()
+        self._cv = multiprocessing.Condition()
 
         self._producers = []
-        self._producer_res_count = {}  # {data_id: count}
-        self._push_res = {}  # {data_id: {op_name: data}}
-
-        self._consumers = {}  # {op_name: idx}
-        self._idx_consumer_num = {}  # {idx: num}
-        self._consumer_base_idx = 0
-        self._front_res = []
+        self._producer_res_count = manager.dict()  # {data_id: count}
+        # self._producer_res_count = {}  # {data_id: count}
+        self._push_res = manager.dict()  # {data_id: {op_name: data}}
+        # self._push_res = {}  # {data_id: {op_name: data}}
+
+        self._consumers = manager.dict()  # {op_name: idx}
+        # self._consumers = {}  # {op_name: idx}
+        self._idx_consumer_num = manager.dict()  # {idx: num}
+        # self._idx_consumer_num = {}  # {idx: num}
+        self._consumer_base_idx = manager.Value('i', 0)
+        # self._consumer_base_idx = 0
+        self._front_res = manager.list()
+        # self._front_res = []
 
     def get_producers(self):
         return self._producers
@@ -286,9 +284,13 @@ class Channel(Queue.Queue):
                     try:
                         self.put(channeldata, timeout=0)
                         break
-                    except Queue.Empty:
+                    except Queue.Full:
                         self._cv.wait()
+                logging.debug(
+                    self._log("{} channel size: {}".format(op_name,
+                                                           self.qsize())))
                 self._cv.notify_all()
+                logging.debug(self._log("{} notify all".format(op_name)))
             logging.debug(self._log("{} push data succ!".format(op_name)))
             return True
         elif op_name is None:
@@ -297,7 +299,7 @@ class Channel(Queue.Queue):
                     "There are multiple producers, so op_name cannot be None."))
 
         producer_num = len(self._producers)
-        data_id = channeldata.pbdata.id
+        data_id = channeldata.id
         put_data = None
         with self._cv:
             logging.debug(self._log("{} get lock".format(op_name)))
@@ -307,7 +309,12 @@ class Channel(Queue.Queue):
                     for name in self._producers
                 }
                 self._producer_res_count[data_id] = 0
-            self._push_res[data_id][op_name] = channeldata
+            # see: https://docs.python.org/3.6/library/multiprocessing.html?highlight=multiprocess#proxy-objects
+            # self._push_res[data_id][op_name] = channeldata
+            tmp_push_res = self._push_res[data_id]
+            tmp_push_res[op_name] = channeldata
+            self._push_res[data_id] = tmp_push_res
+
             if self._producer_res_count[data_id] + 1 == producer_num:
                 put_data = self._push_res[data_id]
                 self._push_res.pop(data_id)
@@ -322,6 +329,9 @@ class Channel(Queue.Queue):
             else:
                 while self._stop is False:
                     try:
+                        logging.debug(
+                            self._log("{} push data succ: {}".format(
+                                op_name, put_data.__str__())))
                         self.put(put_data, timeout=0)
                         break
                     except Queue.Empty:
@@ -333,7 +343,7 @@ class Channel(Queue.Queue):
         return True
 
     def front(self, op_name=None):
-        logging.debug(self._log("{} try to get data".format(op_name)))
+        logging.debug(self._log("{} try to get data...".format(op_name)))
         if len(self._consumers) == 0:
             raise Exception(
                 self._log(
@@ -344,9 +354,18 @@ class Channel(Queue.Queue):
             with self._cv:
                 while self._stop is False and resp is None:
                     try:
-                        resp = self.get(timeout=0)
+                        logging.debug(
+                            self._log("{} try to get(with channel size: {})".
+                                      format(op_name, self.qsize())))
+                        #TODO: bug to fix
+                        # (multiple processes) the queue is not empty, but it raise Queue.Empty                   
+                        resp = self.get(timeout=1e-3)
                         break
                     except Queue.Empty:
+                        logging.debug(
+                            self._log(
+                                "{} wait for empty queue(with channel size: {})".
+                                format(op_name, self.qsize())))
                         self._cv.wait()
             logging.debug(
                 self._log("{} get data succ: {}".format(op_name, resp.__str__(
@@ -360,16 +379,31 @@ class Channel(Queue.Queue):
         with self._cv:
             # data_idx = consumer_idx - base_idx
             while self._stop is False and self._consumers[
-                    op_name] - self._consumer_base_idx >= len(self._front_res):
+                    op_name] - self._consumer_base_idx.value >= len(
+                        self._front_res):
+                logging.debug(
+                    self._log(
+                        "({}) B self._consumers: {}, self._consumer_base_idx: {}, len(self._front_res): {}".
+                        format(op_name, self._consumers, self.
+                               _consumer_base_idx.value, len(self._front_res))))
                 try:
-                    channeldata = self.get(timeout=0)
+                    logging.debug(
+                        self._log("{} try to get(with channel size: {})".format(
+                            op_name, self.qsize())))
+                    #TODO: bug to fix
+                    # (multiple processes) the queue is not empty, but it raise Queue.Empty
+                    channeldata = self.get(timeout=1e-3)
                     self._front_res.append(channeldata)
                     break
                 except Queue.Empty:
+                    logging.debug(
+                        self._log(
+                            "{} wait for empty queue(with channel size: {})".
+                            format(op_name, self.qsize())))
                     self._cv.wait()
 
             consumer_idx = self._consumers[op_name]
-            base_idx = self._consumer_base_idx
+            base_idx = self._consumer_base_idx.value
             data_idx = consumer_idx - base_idx
             resp = self._front_res[data_idx]
             logging.debug(self._log("{} get data: {}".format(op_name, resp)))
@@ -379,14 +413,19 @@ class Channel(Queue.Queue):
                     consumer_idx] == 0:
                 self._idx_consumer_num.pop(consumer_idx)
                 self._front_res.pop(0)
-                self._consumer_base_idx += 1
+                self._consumer_base_idx.value += 1
 
             self._consumers[op_name] += 1
             new_consumer_idx = self._consumers[op_name]
             if self._idx_consumer_num.get(new_consumer_idx) is None:
                 self._idx_consumer_num[new_consumer_idx] = 0
             self._idx_consumer_num[new_consumer_idx] += 1
-
+            logging.debug(
+                self._log(
+                    "({}) A self._consumers: {}, self._consumer_base_idx: {}, len(self._front_res): {}".
+                    format(op_name, self._consumers, self._consumer_base_idx.
+                           value, len(self._front_res))))
+            logging.debug(self._log("{} notify all".format(op_name)))
             self._cv.notify_all()
 
         logging.debug(self._log("multi | {} get data succ!".format(op_name)))
@@ -412,33 +451,42 @@ class Op(object):
                  concurrency=1,
                  timeout=-1,
                  retry=2):
-        self._run = False
+        self._is_run = False
         self.name = name  # to identify the type of OP, it must be globally unique
         self._concurrency = concurrency  # amount of concurrency
         self.set_input_ops(inputs)
-        self.set_client(client_config, server_name, fetch_names)
-        self._server_model = server_model
-        self._server_port = server_port
-        self._device = device
         self._timeout = timeout
         self._retry = max(1, retry)
         self._input = None
         self._outputs = []
 
-    def set_client(self, client_config, server_name, fetch_names):
-        self._client = None
-        if client_config is None or \
-                server_name is None or \
-                fetch_names is None:
+        self.with_serving = False
+        self._client_config = client_config
+        self._server_name = server_name
+        self._fetch_names = fetch_names
+        self._server_model = server_model
+        self._server_port = server_port
+        self._device = device
+        if self._client_config is not None and \
+                self._server_name is not None and \
+                self._fetch_names is not None and \
+                self._server_model is not None and \
+                self._server_port is not None and \
+                self._device is not None:
+            self.with_serving = True
+
+    def init_client(self, client_config, server_name, fetch_names):
+        if self.with_serving == False:
+            logging.debug("{} no client".format(self.name))
             return
+        logging.debug("{} client_config: {}".format(self.name, client_config))
+        logging.debug("{} server_name: {}".format(self.name, server_name))
+        logging.debug("{} fetch_names: {}".format(self.name, fetch_names))
         self._client = Client()
         self._client.load_client_config(client_config)
         self._client.connect([server_name])
         self._fetch_names = fetch_names
 
-    def with_serving(self):
-        return self._client is not None
-
     def get_input_channel(self):
         return self._input
 
@@ -503,48 +551,59 @@ class Op(object):
         self._input.stop()
         for channel in self._outputs:
             channel.stop()
-        self._run = False
+        self._is_run = False
 
     def _parse_channeldata(self, channeldata):
-        data_id, error_pbdata = None, None
+        data_id, error_channeldata = None, None
         if isinstance(channeldata, dict):
             parsed_data = {}
             key = channeldata.keys()[0]
-            data_id = channeldata[key].pbdata.id
+            data_id = channeldata[key].id
             for _, data in channeldata.items():
-                if data.pbdata.ecode != ChannelDataEcode.OK.value:
-                    error_pbdata = data.pbdata
+                if data.ecode != ChannelDataEcode.OK.value:
+                    error_channeldata = data
                     break
         else:
-            data_id = channeldata.pbdata.id
-            if channeldata.pbdata.ecode != ChannelDataEcode.OK.value:
-                error_pbdata = channeldata.pbdata
-        return data_id, error_pbdata
+            data_id = channeldata.id
+            if channeldata.ecode != ChannelDataEcode.OK.value:
+                error_channeldata = channeldata
+        return data_id, error_channeldata
 
-    def _push_to_output_channels(self, data, name=None):
+    def _push_to_output_channels(self, data, channels, name=None):
         if name is None:
             name = self.name
-        for channel in self._outputs:
+        for channel in channels:
             channel.push(data, name)
 
-    def start(self, concurrency_idx):
+    def start(self):
+        proces = []
+        for concurrency_idx in range(self._concurrency):
+            p = multiprocessing.Process(
+                target=self._run,
+                args=(concurrency_idx, self.get_input_channel(),
+                      self.get_output_channels()))
+            p.start()
+            proces.append(p)
+        return proces
+
+    def _run(self, concurrency_idx, input_channel, output_channels):
+        self.init_client(self._client_config, self._server_name,
+                         self._fetch_names)
         op_info_prefix = "[{}|{}]".format(self.name, concurrency_idx)
         log = self._get_log_func(op_info_prefix)
-        self._run = True
-        while self._run:
+        self._is_run = True
+        while self._is_run:
             _profiler.record("{}-get_0".format(op_info_prefix))
-            channeldata = self._input.front(self.name)
+            channeldata = input_channel.front(self.name)
             _profiler.record("{}-get_1".format(op_info_prefix))
             logging.debug(log("input_data: {}".format(channeldata)))
 
-            data_id, error_pbdata = self._parse_channeldata(channeldata)
+            data_id, error_channeldata = self._parse_channeldata(channeldata)
 
             # error data in predecessor Op
-            if error_pbdata is not None:
-                self._push_to_output_channels(
-                    ChannelData(
-                        datatype=ChannelDataType.CHANNEL_PBDATA.value,
-                        pbdata=error_pbdata))
+            if error_channeldata is not None:
+                self._push_to_output_channels(error_channeldata,
+                                              output_channels)
                 continue
 
             # preprecess
@@ -560,31 +619,34 @@ class Op(object):
                     ChannelData(
                         ecode=ChannelDataEcode.NOT_IMPLEMENTED.value,
                         error_info=error_info,
-                        data_id=data_id))
+                        data_id=data_id),
+                    output_channels)
                 continue
             except TypeError as e:
-                # Error type in channeldata.pbdata.type
+                # Error type in channeldata.datatype
                 error_info = log(e)
                 logging.error(error_info)
                 self._push_to_output_channels(
                     ChannelData(
                         ecode=ChannelDataEcode.TYPE_ERROR.value,
                         error_info=error_info,
-                        data_id=data_id))
+                        data_id=data_id),
+                    output_channels)
                 continue
             except Exception as e:
                 error_info = log(e)
                 logging.error(error_info)
                 self._push_to_output_channels(
                     ChannelData(
-                        ecode=ChannelDataEcode.TYPE_ERROR.value,
+                        ecode=ChannelDataEcode.UNKNOW.value,
                         error_info=error_info,
-                        data_id=data_id))
+                        data_id=data_id),
+                    output_channels)
                 continue
 
             # midprocess
             call_future = None
-            if self.with_serving():
+            if self.with_serving:
                 ecode = ChannelDataEcode.OK.value
                 _profiler.record("{}-midp_0".format(op_info_prefix))
                 if self._timeout <= 0:
@@ -620,20 +682,30 @@ class Op(object):
                     self._push_to_output_channels(
                         ChannelData(
                             ecode=ecode, error_info=error_info,
-                            data_id=data_id))
+                            data_id=data_id),
+                        output_channels)
                     continue
                 _profiler.record("{}-midp_1".format(op_info_prefix))
 
             # postprocess
             output_data = None
             _profiler.record("{}-postp_0".format(op_info_prefix))
-            if self.with_serving():
+            if self.with_serving:
                 # use call_future
                 output_data = ChannelData(
                     datatype=ChannelDataType.CHANNEL_FUTURE.value,
                     future=call_future,
                     data_id=data_id,
                     callback_func=self.postprocess)
+                #TODO: for future are not picklable
+                npdata = self.postprocess(call_future.result())
+                self._push_to_output_channels(
+                    ChannelData(
+                        ChannelDataType.CHANNEL_NPDATA.value,
+                        npdata=npdata,
+                        data_id=data_id),
+                    output_channels)
+                continue
             else:
                 try:
                     postped_data = self.postprocess(preped_data)
@@ -644,7 +716,8 @@ class Op(object):
                     self._push_to_output_channels(
                         ChannelData(
                             ecode=ecode, error_info=error_info,
-                            data_id=data_id))
+                            data_id=data_id),
+                        output_channels)
                     continue
                 if not isinstance(postped_data, dict):
                     ecode = ChannelDataEcode.TYPE_ERROR.value
@@ -654,7 +727,8 @@ class Op(object):
                     self._push_to_output_channels(
                         ChannelData(
                             ecode=ecode, error_info=error_info,
-                            data_id=data_id))
+                            data_id=data_id),
+                        output_channels)
                     continue
 
                 output_data = ChannelData(
@@ -665,7 +739,7 @@ class Op(object):
 
             # push data to channel (if run succ)
             _profiler.record("{}-push_0".format(op_info_prefix))
-            self._push_to_output_channels(output_data)
+            self._push_to_output_channels(output_data, output_channels)
             _profiler.record("{}-push_1".format(op_info_prefix))
 
     def _log(self, info):
@@ -701,22 +775,25 @@ class VirtualOp(Op):
             channel.add_producer(op.name)
         self._outputs.append(channel)
 
-    def start(self, concurrency_idx):
+    def _run(self, input_channel, output_channels):
         op_info_prefix = "[{}|{}]".format(self.name, concurrency_idx)
         log = self._get_log_func(op_info_prefix)
-        self._run = True
-        while self._run:
+        self._is_run = True
+        while self._is_run:
             _profiler.record("{}-get_0".format(op_info_prefix))
-            channeldata = self._input.front(self.name)
+            channeldata = input_channel.front(self.name)
             _profiler.record("{}-get_1".format(op_info_prefix))
 
             _profiler.record("{}-push_0".format(op_info_prefix))
             if isinstance(channeldata, dict):
                 for name, data in channeldata.items():
-                    self._push_to_output_channels(data, name=name)
+                    self._push_to_output_channels(
+                        data, channels=output_channels, name=name)
             else:
-                self._push_to_output_channels(channeldata,
-                                              self._virtual_pred_ops[0].name)
+                self._push_to_output_channels(
+                    channeldata,
+                    channels=output_channels,
+                    name=self._virtual_pred_ops[0].name)
             _profiler.record("{}-push_1".format(op_info_prefix))
 
 
@@ -768,7 +845,7 @@ class GeneralPythonService(
                     self._log('data must be ChannelData type, but get {}'.
                               format(type(channeldata))))
             with self._cv:
-                data_id = channeldata.pbdata.id
+                data_id = channeldata.id
                 self._globel_resp_dict[data_id] = channeldata
                 self._cv.notify_all()
 
@@ -788,33 +865,33 @@ class GeneralPythonService(
 
     def _pack_data_for_infer(self, request):
         logging.debug(self._log('start inferce'))
-        pbdata = channel_pb2.ChannelData()
         data_id = self._get_next_id()
-        pbdata.id = data_id
-        pbdata.ecode = ChannelDataEcode.OK.value
+        npdata = {}
         try:
             for idx, name in enumerate(request.feed_var_names):
                 logging.debug(
                     self._log('name: {}'.format(request.feed_var_names[idx])))
                 logging.debug(
                     self._log('data: {}'.format(request.feed_insts[idx])))
-                inst = channel_pb2.Inst()
-                inst.data = request.feed_insts[idx]
-                inst.shape = request.shape[idx]
-                inst.name = name
-                inst.type = request.type[idx]
-                pbdata.insts.append(inst)
+                npdata[name] = np.frombuffer(
+                    request.feed_insts[idx], dtype=request.type[idx])
+                npdata[name].shape = np.frombuffer(
+                    request.shape[idx], dtype="int32")
         except Exception as e:
-            pbdata.ecode = ChannelDataEcode.RPC_PACKAGE_ERROR.value
-            pbdata.error_info = "rpc package error"
-        return ChannelData(
-            datatype=ChannelDataType.CHANNEL_PBDATA.value,
-            pbdata=pbdata), data_id
+            return ChannelData(
+                ecode=ChannelDataEcode.RPC_PACKAGE_ERROR.value,
+                error_info="rpc package error",
+                data_id=data_id), data_id
+        else:
+            return ChannelData(
+                datatype=ChannelDataType.CHANNEL_NPDATA.value,
+                npdata=npdata,
+                data_id=data_id), data_id
 
     def _pack_data_for_resp(self, channeldata):
         logging.debug(self._log('get channeldata'))
         resp = pyservice_pb2.Response()
-        resp.ecode = channeldata.pbdata.ecode
+        resp.ecode = channeldata.ecode
         if resp.ecode == ChannelDataEcode.OK.value:
             if channeldata.datatype == ChannelDataType.CHANNEL_PBDATA.value:
                 for inst in channeldata.pbdata.insts:
@@ -834,10 +911,10 @@ class GeneralPythonService(
                     resp.type.append(str(var.dtype))
             else:
                 raise TypeError(
-                    self._log("Error type({}) in pbdata.type.".format(
+                    self._log("Error type({}) in datatype.".format(
                         channeldata.datatype)))
         else:
-            resp.error_info = channeldata.pbdata.error_info
+            resp.error_info = channeldata.error_info
         return resp
 
     def inference(self, request, context):
@@ -857,11 +934,11 @@ class GeneralPythonService(
             resp_channeldata = self._get_data_in_globel_resp_dict(data_id)
             _profiler.record("{}-fetch_1".format(self.name))
 
-            if resp_channeldata.pbdata.ecode == ChannelDataEcode.OK.value:
+            if resp_channeldata.ecode == ChannelDataEcode.OK.value:
                 break
             if i + 1 < self._retry:
                 logging.warn("retry({}): {}".format(
-                    i + 1, resp_channeldata.pbdata.error_info))
+                    i + 1, resp_channeldata.error_info))
 
         _profiler.record("{}-postpack_0".format(self.name))
         resp = self._pack_data_for_resp(resp_channeldata)
@@ -875,12 +952,12 @@ class PyServer(object):
         self._channels = []
         self._user_ops = []
         self._actual_ops = []
-        self._op_threads = []
         self._port = None
         self._worker_num = None
         self._in_channel = None
         self._out_channel = None
         self._retry = retry
+        self._manager = multiprocessing.Manager()
         _profiler.enable(profile)
 
     def add_channel(self, channel):
@@ -989,7 +1066,7 @@ class PyServer(object):
             for o_idx, op in enumerate(actual_next_view):
                 if op.name in processed_op:
                     continue
-                channel = Channel(name=channel_name_gen.next())
+                channel = Channel(self._manager, name=channel_name_gen.next())
                 channels.append(channel)
                 logging.debug("{} => {}".format(channel.name, op.name))
                 op.add_input_channel(channel)
@@ -1020,7 +1097,7 @@ class PyServer(object):
                                                         other_op.name))
                         other_op.add_input_channel(channel)
                         processed_op.add(other_op.name)
-        output_channel = Channel(name=channel_name_gen.next())
+        output_channel = Channel(self._manager, name=channel_name_gen.next())
         channels.append(output_channel)
         last_op = dag_views[-1][0]
         last_op.add_output_channel(output_channel)
@@ -1044,30 +1121,22 @@ class PyServer(object):
         self._in_channel = input_channel
         self._out_channel = output_channel
         for op in self._actual_ops:
-            if op.with_serving():
+            if op.with_serving:
                 self.prepare_serving(op)
         self.gen_desc()
 
-    def _op_start_wrapper(self, op, concurrency_idx):
-        return op.start(concurrency_idx)
-
     def _run_ops(self):
+        proces = []
         for op in self._actual_ops:
-            op_concurrency = op.get_concurrency()
-            logging.debug("run op: {}, op_concurrency: {}".format(
-                op.name, op_concurrency))
-            for c in range(op_concurrency):
-                th = threading.Thread(
-                    target=self._op_start_wrapper, args=(op, c))
-                th.start()
-                self._op_threads.append(th)
+            proces.extend(op.start())
+        return proces
 
     def _stop_ops(self):
         for op in self._actual_ops:
             op.stop()
 
     def run_server(self):
-        self._run_ops()
+        op_proces = self._run_ops()
         server = grpc.server(
             futures.ThreadPoolExecutor(max_workers=self._worker_num))
         general_python_service_pb2_grpc.add_GeneralPythonServiceServicer_to_server(
@@ -1077,8 +1146,8 @@ class PyServer(object):
         server.start()
         server.wait_for_termination()
         self._stop_ops()  # TODO
-        for th in self._op_threads:
-            th.join()
+        for p in op_proces:
+            p.join()
 
     def prepare_serving(self, op):
         model_path = op._server_model