Mercurial > hgsubversion
view tests/fixtures/propset-branch.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 | e2c3349b2cca |
| children |
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SVN-fs-dump-format-version: 2 UUID: 6506bfb9-9ce8-4b91-8357-4dc8bef2ecc6 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-07-10T11:55:08.483993Z PROPS-END Revision-number: 1 Prop-content-length: 122 Content-length: 122 K 7 svn:log V 21 create initial layout K 10 svn:author V 6 danchr K 8 svn:date V 27 2010-07-10T11:55:57.419315Z 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: 111 Content-length: 111 K 7 svn:log V 10 add a file K 10 svn:author V 6 danchr K 8 svn:date V 27 2010-07-10T11:56:54.708286Z PROPS-END Node-path: trunk/a.txt 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 Revision-number: 3 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 15 create a branch K 10 svn:author V 6 danchr K 8 svn:date V 27 2010-07-10T11:57:29.710978Z PROPS-END Node-path: branches/the-branch Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Revision-number: 4 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 14 set a property K 10 svn:author V 6 danchr K 8 svn:date V 27 2010-07-10T11:58:41.440627Z PROPS-END Node-path: branches/the-branch Node-kind: dir Node-action: change Prop-content-length: 42 Content-length: 42 K 12 the-property V 9 something PROPS-END