Mercurial > hgsubversion
view tests/fixtures/delete_restore_trunk.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 | c4ee11a5d04c |
| children |
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SVN-fs-dump-format-version: 2 UUID: fca176f4-a346-479b-ae2c-78c8442c3809 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2012-05-16T22:55:55.613464Z PROPS-END Revision-number: 1 Prop-content-length: 103 Content-length: 103 K 7 svn:log V 3 btt K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-16T22:55:56.081065Z PROPS-END Node-path: branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: tags Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 8 add file K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-16T22:55:57.071178Z PROPS-END Node-path: trunk/foo Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 4 Text-content-md5: d3b07384d113edec49eaa6238ad5ff00 Text-content-sha1: f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 Content-length: 14 PROPS-END foo Revision-number: 3 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 12 delete trunk K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-16T22:55:59.058026Z PROPS-END Node-path: trunk Node-action: delete Revision-number: 4 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 13 restore trunk K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-16T22:56:01.055887Z PROPS-END Node-path: trunk Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Revision-number: 5 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 14 append to file K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-16T22:56:02.060991Z PROPS-END Node-path: trunk/foo Node-kind: file Node-action: change Text-content-length: 8 Text-content-md5: f47c75614087a8dd938ba4acff252494 Text-content-sha1: 4e48e2c9a3d2ca8a708cb0cc545700544efb5021 Content-length: 8 foo bar