Mercurial > hgsubversion
view tests/fixtures/branchtagcollision.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 | f28e0f54a6ef |
| children |
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SVN-fs-dump-format-version: 2 UUID: 764a21f0-1c44-4bc9-b81b-0321cc58934d Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2011-05-24T15:46:13.951233Z PROPS-END Revision-number: 1 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 14 Initial commit K 10 svn:author V 5 augie K 8 svn:date V 27 2011-05-24T15:46:14.518711Z 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: 111 Content-length: 111 K 7 svn:log V 11 Added fileA K 10 svn:author V 5 augie K 8 svn:date V 27 2011-05-24T15:46:14.922304Z PROPS-END Node-path: trunk/fileA Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 017715e60b9a9450d604e0d489ebc83a Text-content-sha1: d0bcb0015aaadb5317419294648c8da6714af81f Content-length: 16 PROPS-END fileA Revision-number: 3 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 12 added branch K 10 svn:author V 5 augie K 8 svn:date V 27 2011-05-24T15:46:15.328642Z PROPS-END Node-path: branches/A Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk Node-path: branches/A/fileA Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/fileA Text-copy-source-md5: 017715e60b9a9450d604e0d489ebc83a Text-copy-source-sha1: d0bcb0015aaadb5317419294648c8da6714af81f Revision-number: 4 Prop-content-length: 111 Content-length: 111 K 7 svn:log V 11 Added fileB K 10 svn:author V 5 augie K 8 svn:date V 27 2011-05-24T15:46:15.616098Z PROPS-END Node-path: trunk/fileB Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 4eb63bbdec5dfa425e3735dc1d4c5ee8 Text-content-sha1: 03939175ceac92b9c6464d037a0243e22563c423 Content-length: 16 PROPS-END fileB Revision-number: 5 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 13 added bad tag K 10 svn:author V 5 augie K 8 svn:date V 27 2011-05-24T15:46:16.057440Z PROPS-END Node-path: tags/A Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk Node-path: tags/A/fileA Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/fileA Text-copy-source-md5: 017715e60b9a9450d604e0d489ebc83a Text-copy-source-sha1: d0bcb0015aaadb5317419294648c8da6714af81f Node-path: tags/A/fileB Node-kind: file Node-action: add Node-copyfrom-rev: 4 Node-copyfrom-path: trunk/fileB Text-copy-source-md5: 4eb63bbdec5dfa425e3735dc1d4c5ee8 Text-copy-source-sha1: 03939175ceac92b9c6464d037a0243e22563c423