Mercurial > hgsubversion
view tests/fixtures/replace_trunk_with_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 | 22162380c4b9 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 5b65bade-98f3-4993-a01f-b7a6710da339 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2008-12-16T16:37:53.651472Z PROPS-END Revision-number: 1 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 7 initial K 10 svn:author V 5 Augie K 8 svn:date V 27 2008-12-16T16:37:54.139835Z PROPS-END Node-path: branches 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 Node-path: trunk/alpha Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 9f9f90dbe3e5ee1218c86b8839db1995 Content-length: 16 PROPS-END alpha Node-path: trunk/beta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 5 Text-content-md5: f0cf2a92516045024a0c99147b28f05b Content-length: 15 PROPS-END beta Node-path: trunk/gamma Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 303febb9068384eca46b5b6516843b35 Content-length: 16 PROPS-END gamma Revision-number: 2 Prop-content-length: 105 Content-length: 105 K 7 svn:log V 6 branch K 10 svn:author V 5 Augie K 8 svn:date V 27 2008-12-16T16:37:57.116844Z PROPS-END Node-path: branches/test Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk Revision-number: 3 Prop-content-length: 103 Content-length: 103 K 7 svn:log V 4 Mod. K 10 svn:author V 5 Augie K 8 svn:date V 27 2008-12-16T16:37:59.118952Z PROPS-END Node-path: branches/test/alpha Node-kind: file Node-action: change Text-content-length: 10 Text-content-md5: 54add8695a828f4e66224b1ecfd9c576 Content-length: 10 alpha foo Revision-number: 4 Prop-content-length: 102 Content-length: 102 K 7 svn:log V 4 blah K 10 svn:author V 4 evil K 8 svn:date V 27 2008-12-16T16:38:00.236345Z PROPS-END Node-path: trunk Node-kind: dir Node-action: delete Node-path: trunk Node-kind: dir Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: branches/test