Mercurial > hgsubversion
view tests/fixtures/addspecial.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 | b6b1365e3489 |
| children |
line wrap: on
line source
SVN-fs-dump-format-version: 2 UUID: 01df53ad-5d72-4756-8742-f669dc98f791 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2012-05-13T22:22:43.218190Z PROPS-END Revision-number: 1 Prop-content-length: 118 Content-length: 118 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:44.112163Z K 7 svn:log V 17 initial structure 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 Revision-number: 2 Prop-content-length: 103 Content-length: 103 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:45.111247Z K 7 svn:log V 3 ci1 PROPS-END Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 3 Prop-content-length: 111 Content-length: 111 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:48.110257Z K 7 svn:log V 10 branch foo PROPS-END Node-path: branches/foo Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Revision-number: 4 Prop-content-length: 107 Content-length: 107 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:49.115096Z K 7 svn:log V 7 symlink PROPS-END Node-path: branches/foo/fnord Node-kind: file Node-action: add Prop-content-length: 33 Text-content-length: 6 Text-content-md5: c118dba188202a1efc975bef6064180b Text-content-sha1: 41f94e4692313bf7f7c92aa600002f1dff93d6bf Content-length: 39 K 11 svn:special V 1 * PROPS-END link a Revision-number: 5 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:50.119266Z K 7 svn:log V 5 spacy PROPS-END Node-path: branches/foo/spacy name Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: branches/foo/spacy name/spacy file Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 6 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:52.123367Z K 7 svn:log V 5 tilde PROPS-END Node-path: branches/foo/spacy name/surprise ~ Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Text-content-sha1: 89e6c98d92887913cadf06b2adb97f26cde4849b Content-length: 12 PROPS-END b Revision-number: 7 Prop-content-length: 111 Content-length: 111 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:54.129462Z K 7 svn:log V 10 executable PROPS-END Node-path: branches/foo/exe Node-kind: file Node-action: add Prop-content-length: 36 Text-content-length: 4 Text-content-md5: d3b07384d113edec49eaa6238ad5ff00 Text-content-sha1: f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 Content-length: 40 K 14 svn:executable V 1 * PROPS-END foo Revision-number: 8 Prop-content-length: 105 Content-length: 105 K 10 svn:author V 6 bryano K 8 svn:date V 27 2012-05-13T22:22:57.111370Z K 7 svn:log V 5 merge PROPS-END Node-path: trunk Node-kind: dir Node-action: change Prop-content-length: 52 Content-length: 52 K 13 svn:mergeinfo V 17 /branches/foo:3-7 PROPS-END Node-path: trunk/exe Node-kind: file Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/exe Text-copy-source-md5: d3b07384d113edec49eaa6238ad5ff00 Text-copy-source-sha1: f1d2d2f924e986ac86fdf7b36c94bcdf32beec15 Node-path: trunk/fnord Node-kind: file Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/fnord Text-copy-source-md5: c118dba188202a1efc975bef6064180b Text-copy-source-sha1: 41f94e4692313bf7f7c92aa600002f1dff93d6bf Node-path: trunk/spacy name Node-kind: dir Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/foo/spacy name