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cpython/Lib/test/test_bigmem.py

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"""Bigmem tests - tests for the 32-bit boundary in containers.
These tests try to exercise the 32-bit boundary that is sometimes, if
rarely, exceeded in practice, but almost never tested. They are really only
meaningful on 64-bit builds on machines with a *lot* of memory, but the
tests are always run, usually with very low memory limits to make sure the
tests themselves don't suffer from bitrot. To run them for real, pass a
high memory limit to regrtest, with the -M option.
"""
from test import support
from test.support import bigmemtest, _1G, _2G, _4G
import unittest
import operator
import sys
# These tests all use one of the bigmemtest decorators to indicate how much
# memory they use and how much memory they need to be even meaningful. The
# decorators take two arguments: a 'memuse' indicator declaring
# (approximate) bytes per size-unit the test will use (at peak usage), and a
# 'minsize' indicator declaring a minimum *useful* size. A test that
# allocates a bytestring to test various operations near the end will have a
# minsize of at least 2Gb (or it wouldn't reach the 32-bit limit, so the
# test wouldn't be very useful) and a memuse of 1 (one byte per size-unit,
# if it allocates only one big string at a time.)
#
# When run with a memory limit set, both decorators skip tests that need
# more memory than available to be meaningful. The precisionbigmemtest will
# always pass minsize as size, even if there is much more memory available.
# The bigmemtest decorator will scale size upward to fill available memory.
#
# Bigmem testing houserules:
#
# - Try not to allocate too many large objects. It's okay to rely on
# refcounting semantics, and don't forget that 's = create_largestring()'
# doesn't release the old 's' (if it exists) until well after its new
# value has been created. Use 'del s' before the create_largestring call.
#
# - Do *not* compare large objects using assertEqual, assertIn or similar.
# It's a lengthy operation and the errormessage will be utterly useless
# due to its size. To make sure whether a result has the right contents,
# better to use the strip or count methods, or compare meaningful slices.
#
# - Don't forget to test for large indices, offsets and results and such,
# in addition to large sizes. Anything that probes the 32-bit boundary.
#
# - When repeating an object (say, a substring, or a small list) to create
# a large object, make the subobject of a length that is not a power of
# 2. That way, int-wrapping problems are more easily detected.
#
# - Despite the bigmemtest decorator, all tests will actually be called
# with a much smaller number too, in the normal test run (5Kb currently.)
# This is so the tests themselves get frequent testing.
# Consequently, always make all large allocations based on the
# passed-in 'size', and don't rely on the size being very large. Also,
# memuse-per-size should remain sane (less than a few thousand); if your
# test uses more, adjust 'size' upward, instead.
# BEWARE: it seems that one failing test can yield other subsequent tests to
# fail as well. I do not know whether it is due to memory fragmentation
# issues, or other specifics of the platform malloc() routine.
ascii_char_size = 1
ucs2_char_size = 2
ucs4_char_size = 4
pointer_size = 4 if sys.maxsize < 2**32 else 8
class BaseStrTest:
def _test_capitalize(self, size):
_ = self.from_latin1
SUBSTR = self.from_latin1(' abc def ghi')
s = _('-') * size + SUBSTR
caps = s.capitalize()
self.assertEqual(caps[-len(SUBSTR):],
SUBSTR.capitalize())
self.assertEqual(caps.lstrip(_('-')), SUBSTR)
@bigmemtest(size=_2G + 10, memuse=1)
def test_center(self, size):
SUBSTR = self.from_latin1(' abc def ghi')
s = SUBSTR.center(size)
self.assertEqual(len(s), size)
lpadsize = rpadsize = (len(s) - len(SUBSTR)) // 2
if len(s) % 2:
lpadsize += 1
self.assertEqual(s[lpadsize:-rpadsize], SUBSTR)
self.assertEqual(s.strip(), SUBSTR.strip())
@bigmemtest(size=_2G, memuse=2)
def test_count(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = _('.') * size + SUBSTR
self.assertEqual(s.count(_('.')), size)
s += _('.')
self.assertEqual(s.count(_('.')), size + 1)
self.assertEqual(s.count(_(' ')), 3)
self.assertEqual(s.count(_('i')), 1)
self.assertEqual(s.count(_('j')), 0)
@bigmemtest(size=_2G, memuse=2)
def test_endswith(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = _('-') * size + SUBSTR
self.assertTrue(s.endswith(SUBSTR))
self.assertTrue(s.endswith(s))
s2 = _('...') + s
self.assertTrue(s2.endswith(s))
self.assertFalse(s.endswith(_('a') + SUBSTR))
self.assertFalse(SUBSTR.endswith(s))
@bigmemtest(size=_2G + 10, memuse=2)
def test_expandtabs(self, size):
_ = self.from_latin1
s = _('-') * size
tabsize = 8
self.assertTrue(s.expandtabs() == s)
del s
slen, remainder = divmod(size, tabsize)
s = _(' \t') * slen
s = s.expandtabs(tabsize)
self.assertEqual(len(s), size - remainder)
self.assertEqual(len(s.strip(_(' '))), 0)
@bigmemtest(size=_2G, memuse=2)
def test_find(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
sublen = len(SUBSTR)
s = _('').join([SUBSTR, _('-') * size, SUBSTR])
self.assertEqual(s.find(_(' ')), 0)
self.assertEqual(s.find(SUBSTR), 0)
self.assertEqual(s.find(_(' '), sublen), sublen + size)
self.assertEqual(s.find(SUBSTR, len(SUBSTR)), sublen + size)
self.assertEqual(s.find(_('i')), SUBSTR.find(_('i')))
self.assertEqual(s.find(_('i'), sublen),
sublen + size + SUBSTR.find(_('i')))
self.assertEqual(s.find(_('i'), size),
sublen + size + SUBSTR.find(_('i')))
self.assertEqual(s.find(_('j')), -1)
@bigmemtest(size=_2G, memuse=2)
def test_index(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
sublen = len(SUBSTR)
s = _('').join([SUBSTR, _('-') * size, SUBSTR])
self.assertEqual(s.index(_(' ')), 0)
self.assertEqual(s.index(SUBSTR), 0)
self.assertEqual(s.index(_(' '), sublen), sublen + size)
self.assertEqual(s.index(SUBSTR, sublen), sublen + size)
self.assertEqual(s.index(_('i')), SUBSTR.index(_('i')))
self.assertEqual(s.index(_('i'), sublen),
sublen + size + SUBSTR.index(_('i')))
self.assertEqual(s.index(_('i'), size),
sublen + size + SUBSTR.index(_('i')))
self.assertRaises(ValueError, s.index, _('j'))
@bigmemtest(size=_2G, memuse=2)
def test_isalnum(self, size):
_ = self.from_latin1
SUBSTR = _('123456')
s = _('a') * size + SUBSTR
self.assertTrue(s.isalnum())
s += _('.')
self.assertFalse(s.isalnum())
@bigmemtest(size=_2G, memuse=2)
def test_isalpha(self, size):
_ = self.from_latin1
SUBSTR = _('zzzzzzz')
s = _('a') * size + SUBSTR
self.assertTrue(s.isalpha())
s += _('.')
self.assertFalse(s.isalpha())
@bigmemtest(size=_2G, memuse=2)
def test_isdigit(self, size):
_ = self.from_latin1
SUBSTR = _('123456')
s = _('9') * size + SUBSTR
self.assertTrue(s.isdigit())
s += _('z')
self.assertFalse(s.isdigit())
@bigmemtest(size=_2G, memuse=2)
def test_islower(self, size):
_ = self.from_latin1
chars = _(''.join(
chr(c) for c in range(255) if not chr(c).isupper()))
repeats = size // len(chars) + 2
s = chars * repeats
self.assertTrue(s.islower())
s += _('A')
self.assertFalse(s.islower())
@bigmemtest(size=_2G, memuse=2)
def test_isspace(self, size):
_ = self.from_latin1
whitespace = _(' \f\n\r\t\v')
repeats = size // len(whitespace) + 2
s = whitespace * repeats
self.assertTrue(s.isspace())
s += _('j')
self.assertFalse(s.isspace())
@bigmemtest(size=_2G, memuse=2)
def test_istitle(self, size):
_ = self.from_latin1
SUBSTR = _('123456')
s = _('').join([_('A'), _('a') * size, SUBSTR])
self.assertTrue(s.istitle())
s += _('A')
self.assertTrue(s.istitle())
s += _('aA')
self.assertFalse(s.istitle())
@bigmemtest(size=_2G, memuse=2)
def test_isupper(self, size):
_ = self.from_latin1
chars = _(''.join(
chr(c) for c in range(255) if not chr(c).islower()))
repeats = size // len(chars) + 2
s = chars * repeats
self.assertTrue(s.isupper())
s += _('a')
self.assertFalse(s.isupper())
@bigmemtest(size=_2G, memuse=2)
def test_join(self, size):
_ = self.from_latin1
s = _('A') * size
x = s.join([_('aaaaa'), _('bbbbb')])
self.assertEqual(x.count(_('a')), 5)
self.assertEqual(x.count(_('b')), 5)
self.assertTrue(x.startswith(_('aaaaaA')))
self.assertTrue(x.endswith(_('Abbbbb')))
@bigmemtest(size=_2G + 10, memuse=1)
def test_ljust(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = SUBSTR.ljust(size)
self.assertTrue(s.startswith(SUBSTR + _(' ')))
self.assertEqual(len(s), size)
self.assertEqual(s.strip(), SUBSTR.strip())
@bigmemtest(size=_2G + 10, memuse=2)
def test_lower(self, size):
_ = self.from_latin1
s = _('A') * size
s = s.lower()
self.assertEqual(len(s), size)
self.assertEqual(s.count(_('a')), size)
@bigmemtest(size=_2G + 10, memuse=1)
def test_lstrip(self, size):
_ = self.from_latin1
SUBSTR = _('abc def ghi')
s = SUBSTR.rjust(size)
self.assertEqual(len(s), size)
self.assertEqual(s.lstrip(), SUBSTR.lstrip())
del s
s = SUBSTR.ljust(size)
self.assertEqual(len(s), size)
# Type-specific optimization
if isinstance(s, (str, bytes)):
stripped = s.lstrip()
self.assertTrue(stripped is s)
@bigmemtest(size=_2G + 10, memuse=2)
def test_replace(self, size):
_ = self.from_latin1
replacement = _('a')
s = _(' ') * size
s = s.replace(_(' '), replacement)
self.assertEqual(len(s), size)
self.assertEqual(s.count(replacement), size)
s = s.replace(replacement, _(' '), size - 4)
self.assertEqual(len(s), size)
self.assertEqual(s.count(replacement), 4)
self.assertEqual(s[-10:], _(' aaaa'))
@bigmemtest(size=_2G, memuse=2)
def test_rfind(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
sublen = len(SUBSTR)
s = _('').join([SUBSTR, _('-') * size, SUBSTR])
self.assertEqual(s.rfind(_(' ')), sublen + size + SUBSTR.rfind(_(' ')))
self.assertEqual(s.rfind(SUBSTR), sublen + size)
self.assertEqual(s.rfind(_(' '), 0, size), SUBSTR.rfind(_(' ')))
self.assertEqual(s.rfind(SUBSTR, 0, sublen + size), 0)
self.assertEqual(s.rfind(_('i')), sublen + size + SUBSTR.rfind(_('i')))
self.assertEqual(s.rfind(_('i'), 0, sublen), SUBSTR.rfind(_('i')))
self.assertEqual(s.rfind(_('i'), 0, sublen + size),
SUBSTR.rfind(_('i')))
self.assertEqual(s.rfind(_('j')), -1)
@bigmemtest(size=_2G, memuse=2)
def test_rindex(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
sublen = len(SUBSTR)
s = _('').join([SUBSTR, _('-') * size, SUBSTR])
self.assertEqual(s.rindex(_(' ')),
sublen + size + SUBSTR.rindex(_(' ')))
self.assertEqual(s.rindex(SUBSTR), sublen + size)
self.assertEqual(s.rindex(_(' '), 0, sublen + size - 1),
SUBSTR.rindex(_(' ')))
self.assertEqual(s.rindex(SUBSTR, 0, sublen + size), 0)
self.assertEqual(s.rindex(_('i')),
sublen + size + SUBSTR.rindex(_('i')))
self.assertEqual(s.rindex(_('i'), 0, sublen), SUBSTR.rindex(_('i')))
self.assertEqual(s.rindex(_('i'), 0, sublen + size),
SUBSTR.rindex(_('i')))
self.assertRaises(ValueError, s.rindex, _('j'))
@bigmemtest(size=_2G + 10, memuse=1)
def test_rjust(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = SUBSTR.ljust(size)
self.assertTrue(s.startswith(SUBSTR + _(' ')))
self.assertEqual(len(s), size)
self.assertEqual(s.strip(), SUBSTR.strip())
@bigmemtest(size=_2G + 10, memuse=1)
def test_rstrip(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = SUBSTR.ljust(size)
self.assertEqual(len(s), size)
self.assertEqual(s.rstrip(), SUBSTR.rstrip())
del s
s = SUBSTR.rjust(size)
self.assertEqual(len(s), size)
# Type-specific optimization
if isinstance(s, (str, bytes)):
stripped = s.rstrip()
self.assertTrue(stripped is s)
# The test takes about size bytes to build a string, and then about
# sqrt(size) substrings of sqrt(size) in size and a list to
# hold sqrt(size) items. It's close but just over 2x size.
@bigmemtest(size=_2G, memuse=2.1)
def test_split_small(self, size):
_ = self.from_latin1
# Crudely calculate an estimate so that the result of s.split won't
# take up an inordinate amount of memory
chunksize = int(size ** 0.5 + 2)
SUBSTR = _('a') + _(' ') * chunksize
s = SUBSTR * chunksize
l = s.split()
self.assertEqual(len(l), chunksize)
expected = _('a')
for item in l:
self.assertEqual(item, expected)
del l
l = s.split(_('a'))
self.assertEqual(len(l), chunksize + 1)
expected = _(' ') * chunksize
for item in filter(None, l):
self.assertEqual(item, expected)
# Allocates a string of twice size (and briefly two) and a list of
# size. Because of internal affairs, the s.split() call produces a
# list of size times the same one-character string, so we only
# 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)
def test_split_large(self, size):
_ = self.from_latin1
s = _(' a') * size + _(' ')
l = s.split()
self.assertEqual(len(l), size)
self.assertEqual(set(l), set([_('a')]))
del l
l = s.split(_('a'))
self.assertEqual(len(l), size + 1)
self.assertEqual(set(l), set([_(' ')]))
@bigmemtest(size=_2G, memuse=2.1)
def test_splitlines(self, size):
_ = self.from_latin1
# Crudely calculate an estimate so that the result of s.split won't
# take up an inordinate amount of memory
chunksize = int(size ** 0.5 + 2) // 2
SUBSTR = _(' ') * chunksize + _('\n') + _(' ') * chunksize + _('\r\n')
s = SUBSTR * (chunksize * 2)
l = s.splitlines()
self.assertEqual(len(l), chunksize * 4)
expected = _(' ') * chunksize
for item in l:
self.assertEqual(item, expected)
@bigmemtest(size=_2G, memuse=2)
def test_startswith(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi')
s = _('-') * size + SUBSTR
self.assertTrue(s.startswith(s))
self.assertTrue(s.startswith(_('-') * size))
self.assertFalse(s.startswith(SUBSTR))
@bigmemtest(size=_2G, memuse=1)
def test_strip(self, size):
_ = self.from_latin1
SUBSTR = _(' abc def ghi ')
s = SUBSTR.rjust(size)
self.assertEqual(len(s), size)
self.assertEqual(s.strip(), SUBSTR.strip())
del s
s = SUBSTR.ljust(size)
self.assertEqual(len(s), size)
self.assertEqual(s.strip(), SUBSTR.strip())
def _test_swapcase(self, size):
_ = self.from_latin1
SUBSTR = _("aBcDeFG12.'\xa9\x00")
sublen = len(SUBSTR)
repeats = size // sublen + 2
s = SUBSTR * repeats
s = s.swapcase()
self.assertEqual(len(s), sublen * repeats)
self.assertEqual(s[:sublen * 3], SUBSTR.swapcase() * 3)
self.assertEqual(s[-sublen * 3:], SUBSTR.swapcase() * 3)
def _test_title(self, size):
_ = self.from_latin1
SUBSTR = _('SpaaHAaaAaham')
s = SUBSTR * (size // len(SUBSTR) + 2)
s = s.title()
self.assertTrue(s.startswith((SUBSTR * 3).title()))
self.assertTrue(s.endswith(SUBSTR.lower() * 3))
@bigmemtest(size=_2G, memuse=2)
def test_translate(self, size):
_ = self.from_latin1
SUBSTR = _('aZz.z.Aaz.')
trans = bytes.maketrans(b'.aZ', b'-!$')
sublen = len(SUBSTR)
repeats = size // sublen + 2
s = SUBSTR * repeats
s = s.translate(trans)
self.assertEqual(len(s), repeats * sublen)
self.assertEqual(s[:sublen], SUBSTR.translate(trans))
self.assertEqual(s[-sublen:], SUBSTR.translate(trans))
self.assertEqual(s.count(_('.')), 0)
self.assertEqual(s.count(_('!')), repeats * 2)
self.assertEqual(s.count(_('z')), repeats * 3)
@bigmemtest(size=_2G + 5, memuse=2)
def test_upper(self, size):
_ = self.from_latin1
s = _('a') * size
s = s.upper()
self.assertEqual(len(s), size)
self.assertEqual(s.count(_('A')), size)
@bigmemtest(size=_2G + 20, memuse=1)
def test_zfill(self, size):
_ = self.from_latin1
SUBSTR = _('-568324723598234')
s = SUBSTR.zfill(size)
self.assertTrue(s.endswith(_('0') + SUBSTR[1:]))
self.assertTrue(s.startswith(_('-0')))
self.assertEqual(len(s), size)
self.assertEqual(s.count(_('0')), size - len(SUBSTR))
# This test is meaningful even with size < 2G, as long as the
# doubled string is > 2G (but it tests more if both are > 2G :)
@bigmemtest(size=_1G + 2, memuse=3)
def test_concat(self, size):
_ = self.from_latin1
s = _('.') * size
self.assertEqual(len(s), size)
s = s + s
self.assertEqual(len(s), size * 2)
self.assertEqual(s.count(_('.')), size * 2)
# This test is meaningful even with size < 2G, as long as the
# repeated string is > 2G (but it tests more if both are > 2G :)
@bigmemtest(size=_1G + 2, memuse=3)
def test_repeat(self, size):
_ = self.from_latin1
s = _('.') * size
self.assertEqual(len(s), size)
s = s * 2
self.assertEqual(len(s), size * 2)
self.assertEqual(s.count(_('.')), size * 2)
@bigmemtest(size=_2G + 20, memuse=2)
def test_slice_and_getitem(self, size):
_ = self.from_latin1
SUBSTR = _('0123456789')
sublen = len(SUBSTR)
s = SUBSTR * (size // sublen)
stepsize = len(s) // 100
stepsize = stepsize - (stepsize % sublen)
for i in range(0, len(s) - stepsize, stepsize):
self.assertEqual(s[i], SUBSTR[0])
self.assertEqual(s[i:i + sublen], SUBSTR)
self.assertEqual(s[i:i + sublen:2], SUBSTR[::2])
if i > 0:
self.assertEqual(s[i + sublen - 1:i - 1:-3],
SUBSTR[sublen::-3])
# Make sure we do some slicing and indexing near the end of the
# string, too.
self.assertEqual(s[len(s) - 1], SUBSTR[-1])
self.assertEqual(s[-1], SUBSTR[-1])
self.assertEqual(s[len(s) - 10], SUBSTR[0])
self.assertEqual(s[-sublen], SUBSTR[0])
self.assertEqual(s[len(s):], _(''))
self.assertEqual(s[len(s) - 1:], SUBSTR[-1:])
self.assertEqual(s[-1:], SUBSTR[-1:])
self.assertEqual(s[len(s) - sublen:], SUBSTR)
self.assertEqual(s[-sublen:], SUBSTR)
self.assertEqual(len(s[:]), len(s))
self.assertEqual(len(s[:len(s) - 5]), len(s) - 5)
self.assertEqual(len(s[5:-5]), len(s) - 10)
self.assertRaises(IndexError, operator.getitem, s, len(s))
self.assertRaises(IndexError, operator.getitem, s, len(s) + 1)
self.assertRaises(IndexError, operator.getitem, s, len(s) + 1<<31)
@bigmemtest(size=_2G, memuse=2)
def test_contains(self, size):
_ = self.from_latin1
SUBSTR = _('0123456789')
edge = _('-') * (size // 2)
s = _('').join([edge, SUBSTR, edge])
del edge
self.assertTrue(SUBSTR in s)
self.assertFalse(SUBSTR * 2 in s)
self.assertTrue(_('-') in s)
self.assertFalse(_('a') in s)
s += _('a')
self.assertTrue(_('a') in s)
@bigmemtest(size=_2G + 10, memuse=2)
def test_compare(self, size):
_ = self.from_latin1
s1 = _('-') * size
s2 = _('-') * size
self.assertTrue(s1 == s2)
del s2
s2 = s1 + _('a')
self.assertFalse(s1 == s2)
del s2
s2 = _('.') * size
self.assertFalse(s1 == s2)
@bigmemtest(size=_2G + 10, memuse=1)
def test_hash(self, size):
# Not sure if we can do any meaningful tests here... Even if we
# start relying on the exact algorithm used, the result will be
# different depending on the size of the C 'long int'. Even this
# test is dodgy (there's no *guarantee* that the two things should
# have a different hash, even if they, in the current
# implementation, almost always do.)
_ = self.from_latin1
s = _('\x00') * size
h1 = hash(s)
del s
s = _('\x00') * (size + 1)
self.assertNotEqual(h1, hash(s))
class StrTest(unittest.TestCase, BaseStrTest):
def from_latin1(self, s):
return s
def basic_encode_test(self, size, enc, c='.', expectedsize=None):
if expectedsize is None:
expectedsize = size
try:
s = c * size
self.assertEqual(len(s.encode(enc)), expectedsize)
finally:
s = None
def setUp(self):
# HACK: adjust memory use of tests inherited from BaseStrTest
# according to character size.
self._adjusted = {}
for name in dir(BaseStrTest):
if not name.startswith('test_'):
continue
meth = getattr(type(self), name)
try:
memuse = meth.memuse
except AttributeError:
continue
meth.memuse = ascii_char_size * memuse
self._adjusted[name] = memuse
def tearDown(self):
for name, memuse in self._adjusted.items():
getattr(type(self), name).memuse = memuse
@bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
def test_capitalize(self, size):
self._test_capitalize(size)
@bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
def test_title(self, size):
self._test_title(size)
@bigmemtest(size=_2G, memuse=ucs4_char_size * 3 + ascii_char_size * 2)
def test_swapcase(self, size):
self._test_swapcase(size)
# Many codecs convert to the legacy representation first, explaining
# why we add 'ucs4_char_size' to the 'memuse' below.
@bigmemtest(size=_2G + 2, memuse=ascii_char_size + 1)
def test_encode(self, size):
return self.basic_encode_test(size, 'utf-8')
@bigmemtest(size=_4G // 6 + 2, memuse=ascii_char_size + ucs4_char_size + 1)
def test_encode_raw_unicode_escape(self, size):
try:
return self.basic_encode_test(size, 'raw_unicode_escape')
except MemoryError:
pass # acceptable on 32-bit
@bigmemtest(size=_4G // 5 + 70, memuse=ascii_char_size + 8 + 1)
def test_encode_utf7(self, size):
try:
return self.basic_encode_test(size, 'utf7')
except MemoryError:
pass # acceptable on 32-bit
@bigmemtest(size=_4G // 4 + 5, memuse=ascii_char_size + ucs4_char_size + 4)
def test_encode_utf32(self, size):
try:
return self.basic_encode_test(size, 'utf32', expectedsize=4 * size + 4)
except MemoryError:
pass # acceptable on 32-bit
@bigmemtest(size=_2G - 1, memuse=ascii_char_size + 1)
def test_encode_ascii(self, size):
return self.basic_encode_test(size, 'ascii', c='A')
# str % (...) uses a Py_UCS4 intermediate representation
@bigmemtest(size=_2G + 10, memuse=ascii_char_size * 2 + ucs4_char_size)
def test_format(self, size):
s = '-' * size
sf = '%s' % (s,)
self.assertTrue(s == sf)
del sf
sf = '..%s..' % (s,)
self.assertEqual(len(sf), len(s) + 4)
self.assertTrue(sf.startswith('..-'))
self.assertTrue(sf.endswith('-..'))
del s, sf
size //= 2
edge = '-' * size
s = ''.join([edge, '%s', edge])
del edge
s = s % '...'
self.assertEqual(len(s), size * 2 + 3)
self.assertEqual(s.count('.'), 3)
self.assertEqual(s.count('-'), size * 2)
@bigmemtest(size=_2G + 10, memuse=ascii_char_size * 2)
def test_repr_small(self, size):
s = '-' * size
s = repr(s)
self.assertEqual(len(s), size + 2)
self.assertEqual(s[0], "'")
self.assertEqual(s[-1], "'")
self.assertEqual(s.count('-'), size)
del s
# repr() will create a string four times as large as this 'binary
# string', but we don't want to allocate much more than twice
# size in total. (We do extra testing in test_repr_large())
size = size // 5 * 2
s = '\x00' * size
s = repr(s)
self.assertEqual(len(s), size * 4 + 2)
self.assertEqual(s[0], "'")
self.assertEqual(s[-1], "'")
self.assertEqual(s.count('\\'), size)
self.assertEqual(s.count('0'), size * 2)
@bigmemtest(size=_2G + 10, memuse=ascii_char_size * 5)
def test_repr_large(self, size):
s = '\x00' * size
s = repr(s)
self.assertEqual(len(s), size * 4 + 2)
self.assertEqual(s[0], "'")
self.assertEqual(s[-1], "'")
self.assertEqual(s.count('\\'), size)
self.assertEqual(s.count('0'), size * 2)
# ascii() calls encode('ascii', 'backslashreplace'), which itself
# creates a temporary Py_UNICODE representation in addition to the
# original (Py_UCS2) one
# There's also some overallocation when resizing the ascii() result
# that isn't taken into account here.
@bigmemtest(size=_2G // 5 + 1, memuse=ucs2_char_size +
ucs4_char_size + ascii_char_size * 6)
def test_unicode_repr(self, size):
# Use an assigned, but not printable code point.
# It is in the range of the low surrogates \uDC00-\uDFFF.
char = "\uDCBA"
s = char * size
try:
for f in (repr, ascii):
r = f(s)
self.assertEqual(len(r), 2 + (len(f(char)) - 2) * size)
self.assertTrue(r.endswith(r"\udcba'"), r[-10:])
r = None
finally:
r = s = None
@bigmemtest(size=_2G // 5 + 1, memuse=ucs4_char_size * 2 + ascii_char_size * 10)
def test_unicode_repr_wide(self, size):
char = "\U0001DCBA"
s = char * size
try:
for f in (repr, ascii):
r = f(s)
self.assertEqual(len(r), 2 + (len(f(char)) - 2) * size)
self.assertTrue(r.endswith(r"\U0001dcba'"), r[-12:])
r = None
finally:
r = s = None
# The original test_translate is overridden here, so as to get the
# correct size estimate: str.translate() uses an intermediate Py_UCS4
# representation.
@bigmemtest(size=_2G, memuse=ascii_char_size * 2 + ucs4_char_size)
def test_translate(self, size):
_ = self.from_latin1
SUBSTR = _('aZz.z.Aaz.')
trans = {
ord(_('.')): _('-'),
ord(_('a')): _('!'),
ord(_('Z')): _('$'),
}
sublen = len(SUBSTR)
repeats = size // sublen + 2
s = SUBSTR * repeats
s = s.translate(trans)
self.assertEqual(len(s), repeats * sublen)
self.assertEqual(s[:sublen], SUBSTR.translate(trans))
self.assertEqual(s[-sublen:], SUBSTR.translate(trans))
self.assertEqual(s.count(_('.')), 0)
self.assertEqual(s.count(_('!')), repeats * 2)
self.assertEqual(s.count(_('z')), repeats * 3)
class BytesTest(unittest.TestCase, BaseStrTest):
def from_latin1(self, s):
return s.encode("latin-1")
@bigmemtest(size=_2G + 2, memuse=1 + ascii_char_size)
def test_decode(self, size):
s = self.from_latin1('.') * size
self.assertEqual(len(s.decode('utf-8')), size)
@bigmemtest(size=_2G, memuse=2)
def test_capitalize(self, size):
self._test_capitalize(size)
@bigmemtest(size=_2G, memuse=2)
def test_title(self, size):
self._test_title(size)
@bigmemtest(size=_2G, memuse=2)
def test_swapcase(self, size):
self._test_swapcase(size)
class BytearrayTest(unittest.TestCase, BaseStrTest):
def from_latin1(self, s):
return bytearray(s.encode("latin-1"))
@bigmemtest(size=_2G + 2, memuse=1 + ascii_char_size)
def test_decode(self, size):
s = self.from_latin1('.') * size
self.assertEqual(len(s.decode('utf-8')), size)
@bigmemtest(size=_2G, memuse=2)
def test_capitalize(self, size):
self._test_capitalize(size)
@bigmemtest(size=_2G, memuse=2)
def test_title(self, size):
self._test_title(size)
@bigmemtest(size=_2G, memuse=2)
def test_swapcase(self, size):
self._test_swapcase(size)
test_hash = None
test_split_large = None
class TupleTest(unittest.TestCase):
# Tuples have a small, fixed-sized head and an array of pointers to
# data. Since we're testing 64-bit addressing, we can assume that the
# pointers are 8 bytes, and that thus that the tuples take up 8 bytes
# per size.
# As a side-effect of testing long tuples, these tests happen to test
# having more than 2<<31 references to any given object. Hence the
# use of different types of objects as contents in different tests.
@bigmemtest(size=_2G + 2, memuse=pointer_size * 2)
def test_compare(self, size):
t1 = ('',) * size
t2 = ('',) * size
self.assertTrue(t1 == t2)
del t2
t2 = ('',) * (size + 1)
self.assertFalse(t1 == t2)
del t2
t2 = (1,) * size
self.assertFalse(t1 == t2)
# Test concatenating into a single tuple of more than 2G in length,
# and concatenating a tuple of more than 2G in length separately, so
# the smaller test still gets run even if there isn't memory for the
# larger test (but we still let the tester know the larger test is
# skipped, in verbose mode.)
def basic_concat_test(self, size):
t = ((),) * size
self.assertEqual(len(t), size)
t = t + t
self.assertEqual(len(t), size * 2)
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
def test_concat_small(self, size):
return self.basic_concat_test(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
def test_concat_large(self, size):
return self.basic_concat_test(size)
@bigmemtest(size=_2G // 5 + 10, memuse=pointer_size * 5)
def test_contains(self, size):
t = (1, 2, 3, 4, 5) * size
self.assertEqual(len(t), size * 5)
self.assertTrue(5 in t)
self.assertFalse((1, 2, 3, 4, 5) in t)
self.assertFalse(0 in t)
@bigmemtest(size=_2G + 10, memuse=pointer_size)
def test_hash(self, size):
t1 = (0,) * size
h1 = hash(t1)
del t1
t2 = (0,) * (size + 1)
self.assertFalse(h1 == hash(t2))
@bigmemtest(size=_2G + 10, memuse=pointer_size)
def test_index_and_slice(self, size):
t = (None,) * size
self.assertEqual(len(t), size)
self.assertEqual(t[-1], None)
self.assertEqual(t[5], None)
self.assertEqual(t[size - 1], None)
self.assertRaises(IndexError, operator.getitem, t, size)
self.assertEqual(t[:5], (None,) * 5)
self.assertEqual(t[-5:], (None,) * 5)
self.assertEqual(t[20:25], (None,) * 5)
self.assertEqual(t[-25:-20], (None,) * 5)
self.assertEqual(t[size - 5:], (None,) * 5)
self.assertEqual(t[size - 5:size], (None,) * 5)
self.assertEqual(t[size - 6:size - 2], (None,) * 4)
self.assertEqual(t[size:size], ())
self.assertEqual(t[size:size+5], ())
# Like test_concat, split in two.
def basic_test_repeat(self, size):
t = ('',) * size
self.assertEqual(len(t), size)
t = t * 2
self.assertEqual(len(t), size * 2)
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
def test_repeat_small(self, size):
return self.basic_test_repeat(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
def test_repeat_large(self, size):
return self.basic_test_repeat(size)
@bigmemtest(size=_1G - 1, memuse=12)
def test_repeat_large_2(self, size):
return self.basic_test_repeat(size)
@bigmemtest(size=_1G - 1, memuse=pointer_size * 2)
def test_from_2G_generator(self, size):
try:
t = tuple(iter([42]*size))
except MemoryError:
pass # acceptable on 32-bit
else:
self.assertEqual(len(t), size)
self.assertEqual(t[:10], (42,) * 10)
self.assertEqual(t[-10:], (42,) * 10)
@bigmemtest(size=_1G - 25, memuse=pointer_size * 2)
def test_from_almost_2G_generator(self, size):
try:
t = tuple(iter([42]*size))
except MemoryError:
pass # acceptable on 32-bit
else:
self.assertEqual(len(t), size)
self.assertEqual(t[:10], (42,) * 10)
self.assertEqual(t[-10:], (42,) * 10)
# Like test_concat, split in two.
def basic_test_repr(self, size):
t = (False,) * size
s = repr(t)
# The repr of a tuple of Falses is exactly 7 times the tuple length.
self.assertEqual(len(s), size * 7)
self.assertEqual(s[:10], '(False, Fa')
self.assertEqual(s[-10:], 'se, False)')
@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
def test_repr_small(self, size):
return self.basic_test_repr(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
def test_repr_large(self, size):
return self.basic_test_repr(size)
class ListTest(unittest.TestCase):
# Like tuples, lists have a small, fixed-sized head and an array of
# pointers to data, so 8 bytes per size. Also like tuples, we make the
# lists hold references to various objects to test their refcount
# limits.
@bigmemtest(size=_2G + 2, memuse=pointer_size * 2)
def test_compare(self, size):
l1 = [''] * size
l2 = [''] * size
self.assertTrue(l1 == l2)
del l2
l2 = [''] * (size + 1)
self.assertFalse(l1 == l2)
del l2
l2 = [2] * size
self.assertFalse(l1 == l2)
# Test concatenating into a single list of more than 2G in length,
# and concatenating a list of more than 2G in length separately, so
# the smaller test still gets run even if there isn't memory for the
# larger test (but we still let the tester know the larger test is
# skipped, in verbose mode.)
def basic_test_concat(self, size):
l = [[]] * size
self.assertEqual(len(l), size)
l = l + l
self.assertEqual(len(l), size * 2)
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
def test_concat_small(self, size):
return self.basic_test_concat(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
def test_concat_large(self, size):
return self.basic_test_concat(size)
# XXX This tests suffers from overallocation, just like test_append.
# This should be fixed in future.
def basic_test_inplace_concat(self, size):
l = [sys.stdout] * size
l += l
self.assertEqual(len(l), size * 2)
self.assertTrue(l[0] is l[-1])
self.assertTrue(l[size - 1] is l[size + 1])
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
def test_inplace_concat_small(self, size):
return self.basic_test_inplace_concat(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
def test_inplace_concat_large(self, size):
return self.basic_test_inplace_concat(size)
@bigmemtest(size=_2G // 5 + 10, memuse=pointer_size * 5)
def test_contains(self, size):
l = [1, 2, 3, 4, 5] * size
self.assertEqual(len(l), size * 5)
self.assertTrue(5 in l)
self.assertFalse([1, 2, 3, 4, 5] in l)
self.assertFalse(0 in l)
@bigmemtest(size=_2G + 10, memuse=pointer_size)
def test_hash(self, size):
l = [0] * size
self.assertRaises(TypeError, hash, l)
@bigmemtest(size=_2G + 10, memuse=pointer_size)
def test_index_and_slice(self, size):
l = [None] * size
self.assertEqual(len(l), size)
self.assertEqual(l[-1], None)
self.assertEqual(l[5], None)
self.assertEqual(l[size - 1], None)
self.assertRaises(IndexError, operator.getitem, l, size)
self.assertEqual(l[:5], [None] * 5)
self.assertEqual(l[-5:], [None] * 5)
self.assertEqual(l[20:25], [None] * 5)
self.assertEqual(l[-25:-20], [None] * 5)
self.assertEqual(l[size - 5:], [None] * 5)
self.assertEqual(l[size - 5:size], [None] * 5)
self.assertEqual(l[size - 6:size - 2], [None] * 4)
self.assertEqual(l[size:size], [])
self.assertEqual(l[size:size+5], [])
l[size - 2] = 5
self.assertEqual(len(l), size)
self.assertEqual(l[-3:], [None, 5, None])
self.assertEqual(l.count(5), 1)
self.assertRaises(IndexError, operator.setitem, l, size, 6)
self.assertEqual(len(l), size)
l[size - 7:] = [1, 2, 3, 4, 5]
size -= 2
self.assertEqual(len(l), size)
self.assertEqual(l[-7:], [None, None, 1, 2, 3, 4, 5])
l[:7] = [1, 2, 3, 4, 5]
size -= 2
self.assertEqual(len(l), size)
self.assertEqual(l[:7], [1, 2, 3, 4, 5, None, None])
del l[size - 1]
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(l[-1], 4)
del l[-2:]
size -= 2
self.assertEqual(len(l), size)
self.assertEqual(l[-1], 2)
del l[0]
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(l[0], 2)
del l[:2]
size -= 2
self.assertEqual(len(l), size)
self.assertEqual(l[0], 4)
# Like test_concat, split in two.
def basic_test_repeat(self, size):
l = [] * size
self.assertFalse(l)
l = [''] * size
self.assertEqual(len(l), size)
l = l * 2
self.assertEqual(len(l), size * 2)
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 3)
def test_repeat_small(self, size):
return self.basic_test_repeat(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 3)
def test_repeat_large(self, size):
return self.basic_test_repeat(size)
# XXX This tests suffers from overallocation, just like test_append.
# This should be fixed in future.
def basic_test_inplace_repeat(self, size):
l = ['']
l *= size
self.assertEqual(len(l), size)
self.assertTrue(l[0] is l[-1])
del l
l = [''] * size
l *= 2
self.assertEqual(len(l), size * 2)
self.assertTrue(l[size - 1] is l[-1])
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
def test_inplace_repeat_small(self, size):
return self.basic_test_inplace_repeat(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
def test_inplace_repeat_large(self, size):
return self.basic_test_inplace_repeat(size)
def basic_test_repr(self, size):
l = [False] * size
s = repr(l)
# The repr of a list of Falses is exactly 7 times the list length.
self.assertEqual(len(s), size * 7)
self.assertEqual(s[:10], '[False, Fa')
self.assertEqual(s[-10:], 'se, False]')
self.assertEqual(s.count('F'), size)
@bigmemtest(size=_2G // 7 + 2, memuse=pointer_size + ascii_char_size * 7)
def test_repr_small(self, size):
return self.basic_test_repr(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size + ascii_char_size * 7)
def test_repr_large(self, size):
return self.basic_test_repr(size)
# list overallocates ~1/8th of the total size (on first expansion) so
# the single list.append call puts memuse at 9 bytes per size.
@bigmemtest(size=_2G, memuse=pointer_size * 9/8)
def test_append(self, size):
l = [object()] * size
l.append(object())
self.assertEqual(len(l), size+1)
self.assertTrue(l[-3] is l[-2])
self.assertFalse(l[-2] is l[-1])
@bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
def test_count(self, size):
l = [1, 2, 3, 4, 5] * size
self.assertEqual(l.count(1), size)
self.assertEqual(l.count("1"), 0)
# XXX This tests suffers from overallocation, just like test_append.
# This should be fixed in future.
def basic_test_extend(self, size):
l = [object] * size
l.extend(l)
self.assertEqual(len(l), size * 2)
self.assertTrue(l[0] is l[-1])
self.assertTrue(l[size - 1] is l[size + 1])
@bigmemtest(size=_2G // 2 + 2, memuse=pointer_size * 2 * 9/8)
def test_extend_small(self, size):
return self.basic_test_extend(size)
@bigmemtest(size=_2G + 2, memuse=pointer_size * 2 * 9/8)
def test_extend_large(self, size):
return self.basic_test_extend(size)
@bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
def test_index(self, size):
l = [1, 2, 3, 4, 5] * size
size *= 5
self.assertEqual(l.index(1), 0)
self.assertEqual(l.index(5, size - 5), size - 1)
self.assertEqual(l.index(5, size - 5, size), size - 1)
self.assertRaises(ValueError, l.index, 1, size - 4, size)
self.assertRaises(ValueError, l.index, 6)
# This tests suffers from overallocation, just like test_append.
@bigmemtest(size=_2G + 10, memuse=pointer_size * 9/8)
def test_insert(self, size):
l = [1.0] * size
l.insert(size - 1, "A")
size += 1
self.assertEqual(len(l), size)
self.assertEqual(l[-3:], [1.0, "A", 1.0])
l.insert(size + 1, "B")
size += 1
self.assertEqual(len(l), size)
self.assertEqual(l[-3:], ["A", 1.0, "B"])
l.insert(1, "C")
size += 1
self.assertEqual(len(l), size)
self.assertEqual(l[:3], [1.0, "C", 1.0])
self.assertEqual(l[size - 3:], ["A", 1.0, "B"])
@bigmemtest(size=_2G // 5 + 4, memuse=pointer_size * 5)
def test_pop(self, size):
l = ["a", "b", "c", "d", "e"] * size
size *= 5
self.assertEqual(len(l), size)
item = l.pop()
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(item, "e")
self.assertEqual(l[-2:], ["c", "d"])
item = l.pop(0)
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(item, "a")
self.assertEqual(l[:2], ["b", "c"])
item = l.pop(size - 2)
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(item, "c")
self.assertEqual(l[-2:], ["b", "d"])
@bigmemtest(size=_2G + 10, memuse=pointer_size)
def test_remove(self, size):
l = [10] * size
self.assertEqual(len(l), size)
l.remove(10)
size -= 1
self.assertEqual(len(l), size)
# Because of the earlier l.remove(), this append doesn't trigger
# a resize.
l.append(5)
size += 1
self.assertEqual(len(l), size)
self.assertEqual(l[-2:], [10, 5])
l.remove(5)
size -= 1
self.assertEqual(len(l), size)
self.assertEqual(l[-2:], [10, 10])
@bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5)
def test_reverse(self, size):
l = [1, 2, 3, 4, 5] * size
l.reverse()
self.assertEqual(len(l), size * 5)
self.assertEqual(l[-5:], [5, 4, 3, 2, 1])
self.assertEqual(l[:5], [5, 4, 3, 2, 1])
@bigmemtest(size=_2G // 5 + 2, memuse=pointer_size * 5 * 1.5)
def test_sort(self, size):
l = [1, 2, 3, 4, 5] * size
l.sort()
self.assertEqual(len(l), size * 5)
self.assertEqual(l.count(1), size)
self.assertEqual(l[:10], [1] * 10)
self.assertEqual(l[-10:], [5] * 10)
class DictTest(unittest.TestCase):
@bigmemtest(size=357913941, memuse=160)
def test_dict(self, size):
# https://github.com/python/cpython/issues/102701
d = dict.fromkeys(range(size))
d[size] = 1
if __name__ == '__main__':
if len(sys.argv) > 1:
support.set_memlimit(sys.argv[1])
unittest.main()
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