Mercurial > hgsubversion
view tests/fixtures/delentries.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 | 19aabf67c792 |
| children |
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SVN-fs-dump-format-version: 2 UUID: c91f719a-92f6-401b-a65d-c6820897c57c Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2008-12-15T21:48:44.999817Z PROPS-END Revision-number: 1 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 init project K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-12-15T21:48:45.636944Z 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: 113 Content-length: 113 K 7 svn:log V 11 add entries K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-12-15T21:48:46.249879Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Content-length: 12 PROPS-END a Node-path: trunk/aa Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 3 Text-content-md5: d404401c8c6495b206fc35c95e55a6d5 Content-length: 13 PROPS-END aa Node-path: trunk/d1 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d1/c Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 2cd6ee2c70b0bde53fbe6cac3c8b8bb1 Content-length: 12 PROPS-END c Node-path: trunk/d1/d2 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d1/d2/c Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: e29311f6f1bf1af907f9ef9f44b8328b Content-length: 12 PROPS-END d Node-path: trunk/d1/d2/d3 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d1/d2/d3/e Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 9ffbf43126e33be52cd2bf7e01d627f9 Content-length: 12 PROPS-END e Node-path: trunk/d1/d2/d3/f Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 9a8ad92c50cae39aa2c5604fd0ab6d8c Content-length: 12 PROPS-END f Node-path: trunk/d1/d2prefix Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 9 Text-content-md5: 74409dc69996f46a4f59d3f7f39bf7c0 Content-length: 19 PROPS-END d2prefix Revision-number: 3 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 14 remove entries K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-12-15T21:48:47.188246Z PROPS-END Node-path: trunk/d1/d2 Node-action: delete Node-path: trunk/a Node-action: delete