Mercurial > hgsubversion
view tests/test_template_keywords.py @ 931:e1dbd9646d6a
svnwrap: use custom StringIO class in get_file()
The wrappers were calling ra.get_file() with a cStringIO object.
Empirically, svn 1.7.5 is writing 16kB blocks to the stream object, and
cStringIO reallocates its internal buffer and doubles its size whenever
it is filled. With large committed files this requires two large
memory blocks at the same time.
SimpleStringIO implements the mimimum StringIO interface used by
ra.get_file() but instead stores all the blocks and "join" them at the
end. It means more fragmentation but requires only one large block,
without overallocation. Also, 16kB blocks should be friendly to most
allocators.
In practice, this simple change let me convert a revision containing
multiple moderately large files, the largest being around 450MB, with a
32-bits Windows setup, python 2.7, swig svn 1.7.5, in stupid mode, while
it was previously aborting with "not enough memory". The same revision
still fails in replay mode.
author | Patrick Mezard <patrick@mezard.eu> |
---|---|
date | Sun, 16 Sep 2012 19:31:49 +0200 |
parents | f089ca13cc4c |
children | d741f536f23a |
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import test_util import unittest from mercurial import commands from mercurial import error from mercurial import ui try: from mercurial import templatekw templatekw.keywords except ImportError: templatekw = None try: from mercurial import revset revset.methods except ImportError: revset = None class CapturingUI(ui.ui): def __init__(self, *args, **kwds): super(CapturingUI, self).__init__(*args, **kwds) self._output = "" def write(self, msg, *args, **kwds): self._output += msg class TestLogKeywords(test_util.TestBase): @test_util.requiresmodule(templatekw) def test_svn_keywords(self): defaults = {'date': None, 'rev': None, 'user': None} repo = self._load_fixture_and_fetch('two_revs.svndump') # we want one commit that isn't from Subversion self.commitchanges([('foo', 'foo', 'frobnicate\n')]) ui = CapturingUI() commands.log(ui, repo, template='{rev}:{svnrev} ', **defaults) self.assertEqual(ui._output, '0:2 1:3 2: ') ui = CapturingUI() commands.log(ui, repo, template='{rev}:{svnpath} ', **defaults) self.assertEqual(ui._output, '0:/trunk 1:/trunk 2: ') ui = CapturingUI() commands.log(ui, repo, template='{rev}:{svnuuid} ', **defaults) self.assertEqual(ui._output, ('0:df2126f7-00ab-4d49-b42c-7e981dde0bcf ' '1:df2126f7-00ab-4d49-b42c-7e981dde0bcf ' '2: ')) @test_util.requiresmodule(revset) @test_util.requiresmodule(templatekw) def test_svn_revsets(self): repo = self._load_fixture_and_fetch('two_revs.svndump') # we want one commit that isn't from Subversion self.commitchanges([('foo', 'foo', 'frobnicate\n')]) defaults = {'date': None, 'rev': ['fromsvn()'], 'user': None} ui = CapturingUI() commands.log(ui, repo, template='{rev}:{svnrev} ', **defaults) self.assertEqual(ui._output, '0:2 1:3 ') defaults = {'date': None, 'rev': ['svnrev(2)'], 'user': None} ui = CapturingUI() commands.log(ui, repo, template='{rev}:{svnrev} ', **defaults) self.assertEqual(ui._output, '0:2 ') defaults = {'date': None, 'rev': ['fromsvn(1)'], 'user': None} self.assertRaises(error.ParseError, commands.log, self.ui(), repo, template='{rev}:{svnrev} ', **defaults) defaults = {'date': None, 'rev': ['svnrev(1, 2)'], 'user': None} self.assertRaises(error.ParseError, commands.log, self.ui(), repo, template='{rev}:{svnrev} ', **defaults) def suite(): all_tests = [unittest.TestLoader().loadTestsFromTestCase(TestLogKeywords), ] return unittest.TestSuite(all_tests)