Mercurial > hgsubversion
view tests/fixtures/ignores.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 | 91db8fc049b0 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 8ad10f29-7a81-4fb6-a789-b0b0ade2ec54 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2009-02-24T20:04:33.977054Z PROPS-END Revision-number: 1 Prop-content-length: 111 Content-length: 111 K 7 svn:log V 11 Add a file. K 10 svn:author V 5 durin K 8 svn:date V 27 2009-02-24T20:05:12.825468Z PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/bar 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: 2 Prop-content-length: 105 Content-length: 105 K 7 svn:log V 6 ignore K 10 svn:author V 5 durin K 8 svn:date V 27 2009-02-24T20:05:49.334191Z PROPS-END Node-path: trunk Node-kind: dir Node-action: change Prop-content-length: 47 Content-length: 47 K 10 svn:ignore V 15 blah otherblah PROPS-END Revision-number: 3 Prop-content-length: 124 Content-length: 124 K 7 svn:log V 24 another file and ignore. K 10 svn:author V 5 durin K 8 svn:date V 27 2009-02-24T20:07:13.884019Z PROPS-END Node-path: trunk/baz Node-kind: dir Node-action: add Prop-content-length: 37 Content-length: 37 K 10 svn:ignore V 6 magic PROPS-END Node-path: trunk/baz/xyzzy Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 89d447eb9afaeb94e463615e8ded6479 Text-content-sha1: 9b3802ecbad114267dd0d1a431e57b0bca95930a Content-length: 16 PROPS-END xyzzy