Mercurial > hgsubversion
view tests/fixtures/rename_tag_test.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 | 76e9504db03b |
| children |
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SVN-fs-dump-format-version: 2 UUID: b94d0721-81cf-435e-ab14-c40b19ce1924 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-01-17T19:05:32.787484Z PROPS-END Revision-number: 1 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 11 Empty dirs. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:33.116308Z 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: 110 Content-length: 110 K 7 svn:log V 9 Add alpha K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:34.099166Z PROPS-END Node-path: trunk/alpha Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 12 Text-content-md5: 3c72ebf8bbd7fa88b1fdcee5398b5a17 Text-content-sha1: f552a50b53177d35b29a4a0ab1cece918b5b5e9b Content-length: 22 PROPS-END file: alpha Revision-number: 3 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 Add beta K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:36.110949Z PROPS-END Node-path: trunk/beta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 13 Text-content-md5: 981d1eb5fd0bbe05354c292105944863 Text-content-sha1: 5d40e0a9ceda69f3d98d4851a6bee02c10a6e277 Content-length: 23 PROPS-END Data of beta Revision-number: 4 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 tagging r3 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:38.066217Z PROPS-END Node-path: tags/tag_r3 Node-kind: dir Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: trunk Revision-number: 5 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 14 tag from a tag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:38.116376Z PROPS-END Node-path: tags/copied_tag Node-kind: dir Node-action: add Node-copyfrom-rev: 4 Node-copyfrom-path: tags/tag_r3 Revision-number: 6 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 rename a tag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-17T19:05:38.179177Z PROPS-END Node-path: tags/other_tag_r3 Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: tags/copied_tag Node-path: tags/copied_tag Node-action: delete