bpo-33735: Fix test_multiprocessing random failure (GH-8059) (GH-8061)
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 23401fb960bb94e6ea62d2999527968d53d3fc65)
diff --git a/Lib/test/test_multiprocessing.py b/Lib/test/test_multiprocessing.py
index b6747ef..42ccbcd 100644
--- a/Lib/test/test_multiprocessing.py
+++ b/Lib/test/test_multiprocessing.py
@@ -1260,10 +1260,10 @@
self.assertRaises(SayWhenError, it.next)
def test_imap_unordered(self):
- it = self.pool.imap_unordered(sqr, range(1000))
- self.assertEqual(sorted(it), map(sqr, range(1000)))
+ it = self.pool.imap_unordered(sqr, range(100))
+ self.assertEqual(sorted(it), map(sqr, range(100)))
- it = self.pool.imap_unordered(sqr, range(1000), chunksize=53)
+ it = self.pool.imap_unordered(sqr, range(1000), chunksize=100)
self.assertEqual(sorted(it), map(sqr, range(1000)))
def test_imap_unordered_handle_iterable_exception(self):