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diff --git a/src/python/grpcio_tests/tests/qps/worker_server.py b/src/python/grpcio_tests/tests/qps/worker_server.py
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+++ b/src/python/grpcio_tests/tests/qps/worker_server.py
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+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import multiprocessing
+import random
+import threading
+import time
+
+from grpc.beta import implementations
+from grpc.framework.interfaces.face import utilities
+from src.proto.grpc.testing import control_pb2
+from src.proto.grpc.testing import services_pb2
+from src.proto.grpc.testing import stats_pb2
+
+from tests.qps import benchmark_client
+from tests.qps import benchmark_server
+from tests.qps import client_runner
+from tests.qps import histogram
+from tests.unit import resources
+
+
+class WorkerServer(services_pb2.BetaWorkerServiceServicer):
+  """Python Worker Server implementation."""
+
+  def __init__(self):
+    self._quit_event = threading.Event()
+
+  def RunServer(self, request_iterator, context):
+    config = next(request_iterator).setup
+    server, port = self._create_server(config)
+    cores = multiprocessing.cpu_count()
+    server.start()
+    start_time = time.time()
+    yield self._get_server_status(start_time, start_time, port, cores)
+
+    for request in request_iterator:
+      end_time = time.time()
+      status = self._get_server_status(start_time, end_time, port, cores)
+      if request.mark.reset:
+        start_time = end_time
+      yield status
+    server.stop(0)
+
+  def _get_server_status(self, start_time, end_time, port, cores):
+    end_time = time.time()
+    elapsed_time = end_time - start_time
+    stats = stats_pb2.ServerStats(time_elapsed=elapsed_time,
+                                  time_user=elapsed_time,
+                                  time_system=elapsed_time)
+    return control_pb2.ServerStatus(stats=stats, port=port, cores=cores)
+
+  def _create_server(self, config):
+    if config.server_type == control_pb2.SYNC_SERVER:
+      servicer = benchmark_server.BenchmarkServer()
+      server = services_pb2.beta_create_BenchmarkService_server(servicer)
+    elif config.server_type == control_pb2.ASYNC_GENERIC_SERVER:
+      resp_size = config.payload_config.bytebuf_params.resp_size
+      servicer = benchmark_server.GenericBenchmarkServer(resp_size)
+      method_implementations = {
+          ('grpc.testing.BenchmarkService', 'StreamingCall'):
+          utilities.stream_stream_inline(servicer.StreamingCall),
+          ('grpc.testing.BenchmarkService', 'UnaryCall'):
+          utilities.unary_unary_inline(servicer.UnaryCall),
+      }
+      server = implementations.server(method_implementations)
+    else:
+      raise Exception('Unsupported server type {}'.format(config.server_type))
+
+    if config.HasField('security_params'):  # Use SSL
+      server_creds = implementations.ssl_server_credentials([(
+          resources.private_key(), resources.certificate_chain())])
+      port = server.add_secure_port('[::]:{}'.format(config.port), server_creds)
+    else:
+      port = server.add_insecure_port('[::]:{}'.format(config.port))
+
+    return (server, port)
+
+  def RunClient(self, request_iterator, context):
+    config = next(request_iterator).setup
+    client_runners = []
+    qps_data = histogram.Histogram(config.histogram_params.resolution,
+                                   config.histogram_params.max_possible)
+    start_time = time.time()
+
+    # Create a client for each channel
+    for i in xrange(config.client_channels):
+      server = config.server_targets[i % len(config.server_targets)]
+      runner = self._create_client_runner(server, config, qps_data)
+      client_runners.append(runner)
+      runner.start()
+
+    end_time = time.time()
+    yield self._get_client_status(start_time, end_time, qps_data)
+
+    # Respond to stat requests
+    for request in request_iterator:
+      end_time = time.time()
+      status = self._get_client_status(start_time, end_time, qps_data)
+      if request.mark.reset:
+        qps_data.reset()
+        start_time = time.time()
+      yield status
+
+    # Cleanup the clients
+    for runner in client_runners:
+      runner.stop()
+
+  def _get_client_status(self, start_time, end_time, qps_data):
+    latencies = qps_data.get_data()
+    end_time = time.time()
+    elapsed_time = end_time - start_time
+    stats = stats_pb2.ClientStats(latencies=latencies,
+                                  time_elapsed=elapsed_time,
+                                  time_user=elapsed_time,
+                                  time_system=elapsed_time)
+    return control_pb2.ClientStatus(stats=stats)
+
+  def _create_client_runner(self, server, config, qps_data):
+    if config.client_type == control_pb2.SYNC_CLIENT:
+      if config.rpc_type == control_pb2.UNARY:
+        client = benchmark_client.UnarySyncBenchmarkClient(
+            server, config, qps_data)
+      elif config.rpc_type == control_pb2.STREAMING:
+        client = benchmark_client.StreamingSyncBenchmarkClient(
+            server, config, qps_data)
+    elif config.client_type == control_pb2.ASYNC_CLIENT:
+      if config.rpc_type == control_pb2.UNARY:
+        client = benchmark_client.UnaryAsyncBenchmarkClient(
+            server, config, qps_data)
+      else:
+        raise Exception('Async streaming client not supported')
+    else:
+      raise Exception('Unsupported client type {}'.format(config.client_type))
+
+    # In multi-channel tests, we split the load across all channels
+    load_factor = float(config.client_channels)
+    if config.load_params.WhichOneof('load') == 'closed_loop':
+      runner = client_runner.ClosedLoopClientRunner(
+          client, config.outstanding_rpcs_per_channel)
+    else:  # Open loop Poisson
+      alpha = config.load_params.poisson.offered_load / load_factor
+      def poisson():
+        while True:
+          yield random.expovariate(alpha)
+
+      runner = client_runner.OpenLoopClientRunner(client, poisson())
+
+    return runner
+
+  def CoreCount(self, request, context):
+    return control_pb2.CoreResponse(cores=multiprocessing.cpu_count())
+
+  def QuitWorker(self, request, context):
+    self._quit_event.set()
+    return control_pb2.Void()
+
+  def wait_for_quit(self):
+    self._quit_event.wait()