view tests/test_fetch_truncated.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 20e73b5ab6f7
children d741f536f23a
line wrap: on
line source

import test_util

import unittest

from mercurial import commands
from mercurial import hg

class TestFetchTruncatedHistory(test_util.TestBase):
    def test_truncated_history(self, stupid=False):
        # Test repository does not follow the usual layout
        repo_path = self.load_svndump('truncatedhistory.svndump')
        svn_url = test_util.fileurl(repo_path + '/project2')
        commands.clone(self.ui(stupid), svn_url, self.wc_path, noupdate=True)
        repo = hg.repository(self.ui(stupid), self.wc_path)

        # We are converting /project2/trunk coming from:
        #
        # Changed paths:
        #     D /project1
        #     A /project2/trunk (from /project1:2)
        #
        # Here a full fetch should be performed since we are starting
        # the conversion on an already filled branch.
        tip = repo['tip']
        files = tip.manifest().keys()
        files.sort()
        self.assertEqual(files, ['a', 'b'])
        self.assertEqual(repo['tip']['a'].data(), 'a\n')

    def test_truncated_history_stupid(self):
        self.test_truncated_history(True)

def suite():
    all_tests = [unittest.TestLoader().loadTestsFromTestCase(TestFetchTruncatedHistory),
          ]
    return unittest.TestSuite(all_tests)