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bpo-33735: Fix test_multiprocessing random failure (GH-8059)

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When hunting memory leaks using -R 3:3, test_imap_unordered() of
test_multiprocessing leaks randomly a few memory blocks. It is a
false alarm: when testing using -R 3:20 for example, no leak is
detected.

Modify test_imap_unordered() to be closer to test_imap():

* Only test 10 numbers instead of 1000: it's a pool of 4 processes, so
  10 is enough to test at least one number per process
* Use chunksize=100 instead of chunksize=53 to mimick test_imap()
(cherry picked from commit 23401fb960)

Co-authored-by: Victor Stinner <vstinner@redhat.com>
This commit is contained in:
Miss Islington (bot) 2018-07-03 04:38:56 -07:00 • committed by GitHub
parent 4d02ad856f
commit 42b2f84a85
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1 changed files with 3 additions and 3 deletions
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6
Lib/test/_test_multiprocessing.py
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@ -2351,10 +2351,10 @@ def test_imap_handle_iterable_exception(self):
self.assertRaises(SayWhenError, it.__next__)
def test_imap_unordered(self):
it = self.pool.imap_unordered(sqr, list(range(1000)))
self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
it = self.pool.imap_unordered(sqr, list(range(10)))
self.assertEqual(sorted(it), list(map(sqr, list(range(10)))))
it = self.pool.imap_unordered(sqr, list(range(1000)), chunksize=53)
it = self.pool.imap_unordered(sqr, list(range(1000)), chunksize=100)
self.assertEqual(sorted(it), list(map(sqr, list(range(1000)))))
def test_imap_unordered_handle_iterable_exception(self):