Mercurial > hgsubversion
view tests/fixtures/move_into_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 | 1086bd6f6aa4 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 124c25c6-3b41-4c6b-a3a3-a0c9809dc9cb Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-08-14T19:08:00.090868Z PROPS-END Revision-number: 1 Prop-content-length: 111 Content-length: 111 K 7 svn:log V 10 Add files. K 10 svn:author V 9 anonymous K 8 svn:date V 27 2010-08-14T19:09:04.290181Z PROPS-END Node-path: A Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 16 Text-content-md5: 98475036dc73d318982805bf4b16e8b2 Text-content-sha1: d7dff2b1ef48b9c20c23d7b3a08b557957cec3c9 Content-length: 26 PROPS-END This is a file. Node-path: B Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 22 Text-content-md5: d54ff73404ed6041a3bd66850b061bff Text-content-sha1: 4bdb40dfd6ec75cb730e678b5d7786e30170c5fb Content-length: 32 PROPS-END This is another file. Revision-number: 2 Prop-content-length: 111 Content-length: 111 K 7 svn:log V 10 Add trunk. K 10 svn:author V 9 anonymous K 8 svn:date V 27 2010-08-14T19:09:23.652445Z PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 3 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 12 Move a file. K 10 svn:author V 9 anonymous K 8 svn:date V 27 2010-08-14T19:09:33.945291Z PROPS-END Node-path: trunk/A Node-kind: file Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: A Text-copy-source-md5: 98475036dc73d318982805bf4b16e8b2 Text-copy-source-sha1: d7dff2b1ef48b9c20c23d7b3a08b557957cec3c9 Node-path: A Node-action: delete Revision-number: 4 Prop-content-length: 122 Content-length: 122 K 7 svn:log V 18 Move another file. K 10 svn:author V 9 anonymous K 8 svn:date V 27 2010-08-14T19:10:03.135714Z PROPS-END Node-path: trunk/B Node-kind: file Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: B Text-copy-source-md5: d54ff73404ed6041a3bd66850b061bff Text-copy-source-sha1: 4bdb40dfd6ec75cb730e678b5d7786e30170c5fb Node-path: B Node-action: delete