Split and rename test_constants.PARALLELISM

Going forward we'd like to be able to test much larger numbers of RPCs
than the number of threads available to a test.

src/python/grpcio/tests/unit/_cython/_channel_test.py

@@ -60,7 +60,7 @@ def _create_loop_destroy():
 def _in_parallel(behavior, arguments):
   threads = tuple(
       threading.Thread(target=behavior, args=arguments)
-      for _ in range(test_constants.PARALLELISM))
+      for _ in range(test_constants.THREAD_CONCURRENCY))
   for thread in threads:
     thread.start()
   for thread in threads:

src/python/grpcio/tests/unit/framework/common/test_constants.py

@@ -49,8 +49,13 @@ STREAM_LENGTH = 200
 # The size of payloads to transmit in tests.
 PAYLOAD_SIZE = 256 * 1024 + 17
 
-# The parallelism to use in tests of parallel RPCs.
-PARALLELISM = 200
+# The concurrency to use in tests of concurrent RPCs that will not create as
+# many threads as RPCs.
+RPC_CONCURRENCY = 200
+
+# The concurrency to use in tests of concurrent RPCs that will create as many
+# threads as RPCs.
+THREAD_CONCURRENCY = 25
 
 # The size of thread pools to use in tests.
 POOL_SIZE = 10

src/python/grpcio/tests/unit/framework/interfaces/face/_blocking_invocation_inline_service.py

@@ -146,13 +146,13 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
         test_messages.verify(second_request, second_response, self)
 
   def testParallelInvocations(self):
-    pool = logging_pool.pool(test_constants.PARALLELISM)
+    pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY)
     for (group, method), test_messages_sequence in (
         six.iteritems(self._digest.unary_unary_messages_sequences)):
       for test_messages in test_messages_sequence:
         requests = []
         response_futures = []
-        for _ in range(test_constants.PARALLELISM):
+        for _ in range(test_constants.THREAD_CONCURRENCY):
           request = test_messages.request()
           response_future = pool.submit(
               self._invoker.blocking(group, method), request,
@@ -168,13 +168,13 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
     pool.shutdown(wait=True)
 
   def testWaitingForSomeButNotAllParallelInvocations(self):
-    pool = logging_pool.pool(test_constants.PARALLELISM)
+    pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY)
     for (group, method), test_messages_sequence in (
         six.iteritems(self._digest.unary_unary_messages_sequences)):
       for test_messages in test_messages_sequence:
         requests = []
         response_futures_to_indices = {}
-        for index in range(test_constants.PARALLELISM):
+        for index in range(test_constants.THREAD_CONCURRENCY):
           request = test_messages.request()
           response_future = pool.submit(
               self._invoker.blocking(group, method), request,
@@ -184,7 +184,7 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
 
         some_completed_response_futures_iterator = itertools.islice(
             futures.as_completed(response_futures_to_indices),
-            test_constants.PARALLELISM // 2)
+            test_constants.THREAD_CONCURRENCY // 2)
         for response_future in some_completed_response_futures_iterator:
           index = response_futures_to_indices[response_future]
           test_messages.verify(requests[index], response_future.result(), self)

src/python/grpcio/tests/unit/framework/interfaces/face/_future_invocation_asynchronous_event_service.py

@@ -249,7 +249,7 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
       for test_messages in test_messages_sequence:
         requests = []
         response_futures = []
-        for _ in range(test_constants.PARALLELISM):
+        for _ in range(test_constants.THREAD_CONCURRENCY):
           request = test_messages.request()
           response_future = self._invoker.future(group, method)(
               request, test_constants.LONG_TIMEOUT)
@@ -263,13 +263,13 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
           test_messages.verify(request, response, self)
 
   def testWaitingForSomeButNotAllParallelInvocations(self):
-    pool = logging_pool.pool(test_constants.PARALLELISM)
+    pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY)
     for (group, method), test_messages_sequence in (
         six.iteritems(self._digest.unary_unary_messages_sequences)):
       for test_messages in test_messages_sequence:
         requests = []
         response_futures_to_indices = {}
-        for index in range(test_constants.PARALLELISM):
+        for index in range(test_constants.THREAD_CONCURRENCY):
           request = test_messages.request()
           inner_response_future = self._invoker.future(group, method)(
               request, test_constants.LONG_TIMEOUT)
@@ -279,7 +279,7 @@ class TestCase(six.with_metaclass(abc.ABCMeta, test_coverage.Coverage, unittest.
 
         some_completed_response_futures_iterator = itertools.islice(
             futures.as_completed(response_futures_to_indices),
-            test_constants.PARALLELISM // 2)
+            test_constants.THREAD_CONCURRENCY // 2)
         for response_future in some_completed_response_futures_iterator:
           index = response_futures_to_indices[response_future]
           test_messages.verify(requests[index], response_future.result(), self)