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gh-75876: Limit the address space of a bigmem test #156023

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gh-75876: Limit the address space of a bigmem test #156023

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9043fa5
gh-75876: Limit the address space of a bigmem test
serhiy-storchaka Aug 6, 2026
8bc2c01
Do not limit the address space where it cannot work
serhiy-storchaka Aug 18, 2026
78b6dea
gh-75876: Correct the memory use declared by two bigmem tests
serhiy-storchaka Aug 20, 2026
874c66a
gh-75876: Kill a bigmem test which uses more memory than it declares
serhiy-storchaka Aug 20, 2026
1e6565d
Merge branch 'main' into bigmemtest-rlimit
serhiy-storchaka Aug 20, 2026
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gh-75876: Correct the memory use declared by two bigmem tests 
repr() of a list or a tuple of 2**31 False takes 15.3 bytes per item, not 15,
and str.split() takes 10.7 bytes per item and more for a larger string, not 10.
The difference is small, but it grows with the size of the test: 614 MiB for
test_repr_large.
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serhiy-storchaka committed Aug 20, 2026
commit 78b6deaeb8c8335331e5a12a15e0a55473c6001f
10 changes: 5 additions & 5 deletions Lib/test/test_bigmem.py
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Original file line number Diff line number Diff line change
Expand Up @@ -373,7 +373,7 @@ def test_split_small(self, size):
# suffer for the list size. (Otherwise, it'd cost another 48 times
# size in bytes!) Nevertheless, a list of size takes
# 8*size bytes.
@bigmemtest(size=_2G + 5, memuse=ascii_char_size * 2 + pointer_size)
@bigmemtest(size=_2G + 5, memuse=ascii_char_size * 3 + pointer_size)
def test_split_large(self, size):
_ = self.from_latin1
s = _(' a') * size + _(' ')
Expand Down Expand Up @@ -936,11 +936,11 @@ def basic_test_repr(self, size):
self.assertEqual(s[:10], '(False, Fa')
self.assertEqual(s[-10:], 'se, False)')

@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 8)
def test_repr_small(self, size):
return self.basic_test_repr(size)

@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 8)
def test_repr_large(self, size):
return self.basic_test_repr(size)

Expand Down Expand Up @@ -1115,11 +1115,11 @@ def basic_test_repr(self, size):
self.assertEqual(s[-10:], 'se, False]')
self.assertEqual(s.count('F'), size)

@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 8)
def test_repr_small(self, size):
return self.basic_test_repr(size)

@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 8)
def test_repr_large(self, size):
return self.basic_test_repr(size)

Expand Down