Mercurial > hgsubversion
view tests/fixtures/correct.svndump @ 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 | 3bfb7e985c47 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 00000000-0000-0000-0000-000000000000 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-11-30T15:10:25.898546Z PROPS-END Revision-number: 1 Prop-content-length: 100 Content-length: 100 K 7 svn:log V 0 K 10 svn:author V 6 danchr K 8 svn:date V 27 2010-11-30T15:16:01.077550Z PROPS-END Node-path: empty-file Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 0 Text-content-md5: d41d8cd98f00b204e9800998ecf8427e Text-content-sha1: da39a3ee5e6b4b0d3255bfef95601890afd80709 Content-length: 10 PROPS-END Node-path: executable-file Node-kind: file Node-action: add Prop-content-length: 36 Text-content-length: 11 Text-content-md5: 01839ba8c81c3b2c7486607e0c683e62 Text-content-sha1: 5e70f8a25fe8ad4ad971bfd3388c258b019268d4 Content-length: 47 K 14 svn:executable V 1 * PROPS-END Executable Node-path: regular-file Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 10 Text-content-md5: 2e01b7f4ab0c18c05a3059eb2e2420d9 Text-content-sha1: 6e530e985be313a43dc9734251656be8f0c94ab8 Content-length: 20 PROPS-END Contents. Node-path: another-regular-file Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 10 Text-content-md5: 2e01b7f4ab0c18c05a3059eb2e2420d9 Text-content-sha1: 6e530e985be313a43dc9734251656be8f0c94ab8 Content-length: 20 PROPS-END Contents. Node-path: symlink Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: 654580f41818cd6f51408c7cbd313728 Text-content-sha1: 130b8faaf3e1acc1b95f77ac835e9c8b6eee5c96 Content-length: 39 K 11 svn:special V 1 * PROPS-END link A