Mercurial > hgsubversion
view tests/fixtures/file_not_in_trunk_root.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 | b20a6c149021 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 8904f924-d410-4c11-97ad-f853c35ee419 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2009-03-09T16:36:52.319733Z PROPS-END Revision-number: 1 Prop-content-length: 102 Content-length: 102 K 7 svn:log V 3 btt K 10 svn:author V 5 Augie K 8 svn:date V 27 2009-03-09T16:36:53.075933Z 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 10 Add files. K 10 svn:author V 5 Augie K 8 svn:date V 27 2009-03-09T16:36:54.163467Z PROPS-END Node-path: trunk/narf Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/narf/alpha Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 9f9f90dbe3e5ee1218c86b8839db1995 Text-content-sha1: d046cd9b7ffb7661e449683313d41f6fc33e3130 Content-length: 16 PROPS-END alpha Node-path: trunk/narf/beta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 5 Text-content-md5: f0cf2a92516045024a0c99147b28f05b Text-content-sha1: 6c007a14875d53d9bf0ef5a6fc0257c817f0fb83 Content-length: 15 PROPS-END beta Node-path: trunk/narf/delta Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: d2840cc81bc032bd1141b56687d0f93c Text-content-sha1: 4bd6315d6d7824c4e376847ca7d116738ad2f29a Content-length: 16 PROPS-END delta Node-path: trunk/narf/gamma Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 6 Text-content-md5: 303febb9068384eca46b5b6516843b35 Text-content-sha1: 37f385b028bf2f93a4b497ca9ff44eea63945b7f Content-length: 16 PROPS-END gamma