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  r77794 | jesse.noller | 2010-01-26 22:05:57 -0500 (Tue, 26 Jan 2010) | 1 line

  Issue #6963: Added maxtasksperchild argument to multiprocessing.Pool
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This commit is contained in:
Jesse Noller 2010-01-27 03:36:01 +00:00
parent c3511a461d
commit 1f0b658638
6 changed files with 130 additions and 19 deletions
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26
Lib/test/test_multiprocessing.py
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@ -46,7 +46,7 @@ def latin(s):
#
LOG_LEVEL = util.SUBWARNING
#LOG_LEVEL = logging.WARNING
#LOG_LEVEL = logging.DEBUG
DELTA = 0.1
CHECK_TIMINGS = False # making true makes tests take a lot longer
@ -1053,6 +1053,30 @@ class _TestPool(BaseTestCase):
join = TimingWrapper(self.pool.join)
join()
self.assertTrue(join.elapsed < 0.2)
class _TestPoolWorkerLifetime(BaseTestCase):
ALLOWED_TYPES = ('processes', )
def test_pool_worker_lifetime(self):
p = multiprocessing.Pool(3, maxtasksperchild=10)
self.assertEqual(3, len(p._pool))
origworkerpids = [w.pid for w in p._pool]
# Run many tasks so each worker gets replaced (hopefully)
results = []
for i in range(100):
results.append(p.apply_async(sqr, (i, )))
# Fetch the results and verify we got the right answers,
# also ensuring all the tasks have completed.
for (j, res) in enumerate(results):
self.assertEqual(res.get(), sqr(j))
# Refill the pool
p._repopulate_pool()
# Finally, check that the worker pids have changed
finalworkerpids = [w.pid for w in p._pool]
self.assertNotEqual(sorted(origworkerpids), sorted(finalworkerpids))
p.close()
p.join()
#
# Test that manager has expected number of shared objects left
#