Tweaks for test__pool timeout under coverage in 3.7

Try to make it take less than the 200s timeout.

src/greentest/greentest/patched_tests_setup.py

@@ -269,6 +269,14 @@ if LIBUV:
             'test_socket.GeneralModuleTests.test_uknown_socket_family_repr',
         ]
 
+        if PY37:
+
+            disabled_tests += [
+                # This test sometimes fails at line 358. It's apparently
+                # extremely sensitive to timing.
+                'test_selectors.PollSelectorTestCase.test_timeout',
+            ]
+
         if OSX:
             disabled_tests += [
                 # XXX: Starting when we upgraded from libuv 1.18.0

src/greentest/greentest/testrunner.py

@@ -68,6 +68,15 @@ if RUNNING_ON_CI:
         # spawn processes of its own
         'test_signal.py',
     ]
+
+    if RUN_LEAKCHECKS and PY3:
+        # On a heavily loaded box, these can all take upwards of 200s
+        RUN_ALONE += [
+            'test__pool.py',
+            'test__pywsgi.py',
+            'test__queue.py',
+        ]
+
     if PYPY:
         # This often takes much longer on PyPy on CI.
         TEST_FILE_OPTIONS['test__threadpool.py'] = {'timeout': 180}

src/greentest/test__pool.py

@@ -297,7 +297,7 @@ LARGE_RANGE = 1000
 
 if (greentest.PYPY and greentest.WIN) or greentest.RUN_LEAKCHECKS or greentest.RUN_COVERAGE:
     # See comments in test__threadpool.py.
-    LARGE_RANGE = 50
+    LARGE_RANGE = 25
 elif greentest.RUNNING_ON_CI or greentest.EXPECT_POOR_TIMER_RESOLUTION:
     LARGE_RANGE = 100
 
@@ -465,7 +465,7 @@ class TestPool(greentest.TestCase): # pylint:disable=too-many-public-methods
             l = reader()
             self.assertEqual(sorted(l), iterable)
 
-
+@greentest.ignores_leakcheck
 class TestPool2(TestPool):
     size = 2