make send_data and RemoteData useful (#202)

tensorpack/dataflow/common.py

@@ -47,6 +47,12 @@ class TestDataSpeed(ProxyDataFlow):
                 if idx == self.test_size - 1:
                     break
 
+    def start(self):
+        """
+        Alias of start_test.
+        """
+        self.start_test()
+
 
 class BatchData(ProxyDataFlow):
     """

tensorpack/dataflow/remote.py

@@ -10,34 +10,33 @@ except ImportError:
     logger.warn("Error in 'import zmq'. remote feature won't be available")
     __all__ = []
 else:
-    __all__ = ['serve_data', 'RemoteData']
+    __all__ = ['send_dataflow_zmq', 'RemoteDataZMQ']
 
 from .base import DataFlow
-from .common import RepeatedData
 from ..utils import logger
 from ..utils.serialize import dumps, loads
 
 
-def serve_data(ds, addr):
+def send_dataflow_zmq(df, addr, hwm=50):
     """
-    Serve the DataFlow on a ZMQ socket addr.
+    Run DataFlow and send data to a ZMQ socket addr.
     It will dump and send each datapoint to this addr with a PUSH socket.
 
     Args:
-        ds (DataFlow): DataFlow to serve. Will infinitely loop over the DataFlow.
+        df (DataFlow): Will infinitely loop over the DataFlow.
         addr: a ZMQ socket addr.
+        hwm (int): high water mark
     """
     ctx = zmq.Context()
     socket = ctx.socket(zmq.PUSH)
-    socket.set_hwm(10)
-    socket.bind(addr)
-    ds = RepeatedData(ds, -1)
+    socket.set_hwm(hwm)
+    socket.connect(addr)
     try:
-        ds.reset_state()
-        logger.info("Serving data at {}".format(addr))
+        df.reset_state()
+        logger.info("Serving data to {}".format(addr))
         # TODO print statistics such as speed
         while True:
-            for dp in ds.get_data():
+            for dp in df.get_data():
                 socket.send(dumps(dp), copy=False)
     finally:
         socket.setsockopt(zmq.LINGER, 0)
@@ -46,39 +45,73 @@ def serve_data(ds, addr):
             ctx.destroy(0)
 
 
-class RemoteData(DataFlow):
-    """ Produce data from a ZMQ socket.  """
-    def __init__(self, addr):
+class RemoteDataZMQ(DataFlow):
+    """ Produce data from ZMQ PULL socket(s).  """
+    def __init__(self, addr1, addr2=None):
         """
         Args:
-            addr (str): addr of the socket to connect to.
+            addr1,addr2 (str): addr of the socket to connect to.
+                Use both if you need two protocols (e.g. both IPC and TCP).
+                I don't think you'll ever need 3.
         """
-        self._addr = addr
+        assert addr1
+        self._addr1 = addr1
+        self._addr2 = addr2
 
     def get_data(self):
         try:
             ctx = zmq.Context()
-            socket = ctx.socket(zmq.PULL)
-            socket.connect(self._addr)
+            if self._addr2 is None:
+                socket = ctx.socket(zmq.PULL)
+                socket.set_hwm(50)
+                socket.bind(self._addr1)
 
-            while True:
-                dp = loads(socket.recv(copy=False))
-                yield dp
+                while True:
+                    dp = loads(socket.recv(copy=False).bytes)
+                    yield dp
+            else:
+                socket1 = ctx.socket(zmq.PULL)
+                socket1.set_hwm(50)
+                socket1.bind(self._addr1)
+
+                socket2 = ctx.socket(zmq.PULL)
+                socket2.set_hwm(50)
+                socket2.bind(self._addr2)
+
+                poller = zmq.Poller()
+                poller.register(socket1, zmq.POLLIN)
+                poller.register(socket2, zmq.POLLIN)
+
+                while True:
+                    evts = poller.poll()
+                    for sock, evt in evts:
+                        dp = loads(sock.recv(copy=False).bytes)
+                        yield dp
         finally:
             ctx.destroy(linger=0)
 
 
 if __name__ == '__main__':
-    import sys
-    from tqdm import tqdm
+    from argparse import ArgumentParser
     from .raw import FakeData
-    addr = "tcp://127.0.0.1:8877"
-    if sys.argv[1] == 'serve':
-        ds = FakeData([(128, 244, 244, 3)], 1000)
-        serve_data(ds, addr)
+    from .common import TestDataSpeed
+
+    """
+    Test the multi-producer single-consumer model
+    """
+    parser = ArgumentParser()
+    parser.add_argument('-t', '--task', choices=['send', 'recv'], required=True)
+    parser.add_argument('-a', '--addr1', required=True)
+    parser.add_argument('-b', '--addr2', default=None)
+    args = parser.parse_args()
+
+    # tcp addr like "tcp://127.0.0.1:8877"
+    # ipc addr like "ipc:///tmp/ipc-test"
+    if args.task == 'send':
+        # use random=True to make it slow and cpu-consuming
+        ds = FakeData([(128, 244, 244, 3)], 1000, random=True)
+        send_dataflow_zmq(ds, args.addr1)
     else:
-        ds = RemoteData(addr)
+        ds = RemoteDataZMQ(args.addr1, args.addr2)
         logger.info("Each DP is 73.5MB")
-        with tqdm(total=10000) as pbar:
-            for k in ds.get_data():
-                pbar.update()
+        TestDataSpeed(ds).start_test()