Mercurial > hgsubversion
view tests/test_hooks.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 | 92bd7b3678ea |
children | d741f536f23a |
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import sys import test_util import unittest from mercurial import hg from mercurial import commands class TestHooks(test_util.TestBase): def setUp(self): super(TestHooks, self).setUp() def _loadupdate(self, fixture_name, *args, **kwargs): kwargs = kwargs.copy() kwargs.update(stupid=False, noupdate=False) repo, repo_path = self.load_and_fetch(fixture_name, *args, **kwargs) return repo, repo_path def test_updatemetahook(self): repo, repo_path = self._loadupdate('single_rev.svndump') state = repo.parents() self.add_svn_rev(repo_path, {'trunk/alpha': 'Changed'}) commands.pull(self.repo.ui, self.repo) # Clone to a new repository and add a hook new_wc_path = "%s-2" % self.wc_path commands.clone(self.repo.ui, self.wc_path, new_wc_path) newrepo = hg.repository(test_util.testui(), new_wc_path) newrepo.ui.setconfig('hooks', 'changegroup.meta', 'python:hgsubversion.hooks.updatemeta.hook') # Commit a rev that should trigger svn meta update self.add_svn_rev(repo_path, {'trunk/alpha': 'Changed Again'}) commands.pull(self.repo.ui, self.repo) self.called = False import hgsubversion.svncommands oldupdatemeta = hgsubversion.svncommands.updatemeta def _updatemeta(ui, repo, args=[]): self.called = True hgsubversion.svncommands.updatemeta = _updatemeta # Pull and make sure our updatemeta function gets called commands.pull(newrepo.ui, newrepo) hgsubversion.svncommands.updatemeta = oldupdatemeta self.assertTrue(self.called) def suite(): return unittest.findTestCases(sys.modules[__name__])