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bpo-33723: Remove busy loop from test_time (GH-10773) 

The "busy loops" of test_process_time() and test_thread_time() are
not reliable and fail randomly on Windows: remove them.
This commit is contained in:
Victor Stinner 2018-11-28 18:30:10 +01:00 committed by GitHub
parent f7e4d3642f
commit 48498dd57f
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1 changed files with 0 additions and 47 deletions
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47
Lib/test/test_time.py
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@ -46,12 +46,6 @@ ROUNDING_MODES = (
)
def busy_wait(duration):
deadline = time.monotonic() + duration
while time.monotonic() < deadline:
pass
class TimeTestCase(unittest.TestCase):
def setUp(self):
@ -495,25 +489,6 @@ class TimeTestCase(unittest.TestCase):
# on Windows
self.assertLess(stop - start, 0.020)
# bpo-33723: A busy loop of 100 ms should increase process_time()
# by at least 15 ms. Tolerate 15 ms because of the bad resolution of
# the clock on Windows (around 15.6 ms).
min_time = 0.015
busy_time = 0.100
# process_time() should include CPU time spent in any thread
start = time.process_time()
busy_wait(busy_time)
stop = time.process_time()
self.assertGreaterEqual(stop - start, min_time)
t = threading.Thread(target=busy_wait, args=(busy_time,))
start = time.process_time()
t.start()
t.join()
stop = time.process_time()
self.assertGreaterEqual(stop - start, min_time)
info = time.get_clock_info('process_time')
self.assertTrue(info.monotonic)
self.assertFalse(info.adjustable)
@ -534,28 +509,6 @@ class TimeTestCase(unittest.TestCase):
# on Windows
self.assertLess(stop - start, 0.020)
# bpo-33723: A busy loop of 100 ms should increase thread_time()
# by at least 15 ms, but less than 30 ms in other threads.
# Tolerate 15 and 30 ms because of the bad resolution
# of the clock on Windows (around 15.6 ms).
min_time = 0.015
max_time = 0.030
busy_time = 0.100
# thread_time() should include CPU time spent in current thread...
start = time.thread_time()
busy_wait(busy_time)
stop = time.thread_time()
self.assertGreaterEqual(stop - start, min_time)
# ...but not in other threads
t = threading.Thread(target=busy_wait, args=(busy_time,))
start = time.thread_time()
t.start()
t.join()
stop = time.thread_time()
self.assertLess(stop - start, max_time)
info = time.get_clock_info('thread_time')
self.assertTrue(info.monotonic)
self.assertFalse(info.adjustable)