Mercurial > hgsubversion
view tests/fixtures/renametagdir.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 | d380e7e4175a |
| children |
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SVN-fs-dump-format-version: 2 UUID: b3e24de6-f874-406f-9561-e48db081ff5e Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-01-20T12:58:05.107637Z PROPS-END Revision-number: 1 Prop-content-length: 104 Content-length: 104 K 7 svn:log V 3 btt K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:06.111903Z 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: 110 Content-length: 110 K 7 svn:log V 9 Add file. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:07.088858Z 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: 108 Content-length: 108 K 7 svn:log V 7 Branch. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:10.062719Z PROPS-END Node-path: branches/test Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Revision-number: 4 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 First tag. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:12.060717Z PROPS-END Node-path: tags/test-0.1 Node-kind: dir Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: branches/test Revision-number: 5 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 Weird tag. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:12.110400Z PROPS-END Node-path: tags/test-0.1/test Node-kind: dir Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: branches/test Revision-number: 6 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 13 Fix tag pt 1. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:12.169328Z PROPS-END Node-path: tags/test-0.1/test Node-action: delete Node-path: tags/test-0.1-real Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: tags/test-0.1/test Revision-number: 7 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 13 Remove weird. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:12.212355Z PROPS-END Node-path: tags/test-0.1 Node-action: delete Revision-number: 8 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 13 Fix tag pt 2. K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-01-20T12:58:12.317421Z PROPS-END Node-path: tags/test-0.1 Node-kind: dir Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: tags/test-0.1-real Node-path: tags/test-0.1-real Node-action: delete