Mercurial > hgsubversion
view tests/fixtures/filecase.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 | 3a9d6cd18332 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 43703c40-3731-4eff-a4bd-16f771fbf860 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2008-12-07T13:00:57.919880Z 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 2008-12-07T13:00:58.039069Z 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 files K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-12-07T13:00:59.209541Z PROPS-END Node-path: trunk/A Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: bf072e9119077b4e76437a93986787ef Content-length: 12 PROPS-END A Node-path: trunk/D Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/D/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/F Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: d2a33790e5bf28b33cdbf61722a06989 Content-length: 12 PROPS-END F 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/b Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Content-length: 12 PROPS-END b Node-path: trunk/d Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d/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/e Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/e/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/f Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/f/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 Revision-number: 3 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 11 change case K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-12-07T13:01:03.159028Z PROPS-END Node-path: trunk/B Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/b Text-copy-source-md5: 3b5d5c3712955042212316173ccf37be Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: trunk/E Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/e Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: trunk/d/A Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/d/a Text-copy-source-md5: 60b725f10c9c85c70d97880dfe8191b3 Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: trunk/d/a Node-action: delete Node-path: trunk/b Node-action: delete Node-path: trunk/e Node-action: delete