Mercurial > hgsubversion
view tests/fixtures/mergeexternals.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 | ba65c0b01d4f |
| children |
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SVN-fs-dump-format-version: 2 UUID: b402ceb9-6185-4dce-93a1-92de515c5c8b Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2011-02-25T13:54:38.654361Z 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 2011-02-25T13:54:38.675100Z 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: 109 Content-length: 109 K 7 svn:log V 8 addfiles K 10 svn:author V 7 pmezard K 8 svn:date V 27 2011-02-25T13:54:39.078800Z PROPS-END Node-path: trunk/common Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/common/ext Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/common/ext/c Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 2cd6ee2c70b0bde53fbe6cac3c8b8bb1 Text-content-sha1: 2b66fd261ee5c6cfc8de7fa466bab600bcfe4f69 Content-length: 12 PROPS-END c Node-path: trunk/d1 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d1/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 Node-path: trunk/d2 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/d2/b 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: 3 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 addexternals K 10 svn:author V 7 pmezard K 8 svn:date V 27 2011-02-25T13:54:41.071346Z PROPS-END Node-path: trunk/d1 Node-kind: dir Node-action: change Prop-content-length: 58 Content-length: 58 K 13 svn:externals V 23 ^/trunk/common/ext ext PROPS-END Node-path: trunk/d2 Node-kind: dir Node-action: change Prop-content-length: 58 Content-length: 58 K 13 svn:externals V 23 ^/trunk/common/ext ext PROPS-END Revision-number: 4 Prop-content-length: 110 Content-length: 110 K 7 svn:log V 9 addbranch K 10 svn:author V 7 pmezard K 8 svn:date V 27 2011-02-25T13:54:44.043149Z PROPS-END Node-path: branches/branch Node-kind: dir Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: trunk Revision-number: 5 Prop-content-length: 113 Content-length: 113 K 7 svn:log V 11 touchbranch K 10 svn:author V 7 pmezard K 8 svn:date V 27 2011-02-25T13:54:45.080319Z PROPS-END Node-path: branches/branch/d3 Node-kind: dir Node-action: add Prop-content-length: 59 Content-length: 59 K 13 svn:externals V 24 ^/trunk/common/ext ext3 PROPS-END Node-path: branches/branch/d3/d Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: e29311f6f1bf1af907f9ef9f44b8328b Text-content-sha1: e983f374794de9c64e3d1c1de1d490c0756eeeff Content-length: 12 PROPS-END d Revision-number: 6 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 5 merge K 10 svn:author V 7 pmezard K 8 svn:date V 27 2011-02-25T13:54:48.049151Z PROPS-END Node-path: trunk Node-kind: dir Node-action: change Prop-content-length: 55 Content-length: 55 K 13 svn:mergeinfo V 20 /branches/branch:4-5 PROPS-END Node-path: trunk/d3 Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: branches/branch/d3 Prop-content-length: 59 Content-length: 59 K 13 svn:externals V 24 ^/trunk/common/ext ext3 PROPS-END