Mercurial > hgsubversion
view tests/fixtures/commit-to-tag.sh @ 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 | 9e6499c415a9 |
children |
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#!/bin/sh mkdir temp cd temp svnadmin create repo REPOPATH="file://`pwd`/repo" svn co $REPOPATH wc cd wc mkdir -p branches/magic trunk tags svn add * svn ci -m 'btt' cd branches/magic for a in alpha beta gamma; do echo $a > $a svn add $a svn ci -m "Add file $a" done cd ../.. svn up svn cp $REPOPATH/branches/magic $REPOPATH/tags/will-edit -m 'Make tag to edit' svn up cd branches/magic for a in delta iota lambda; do echo $a > $a svn add $a svn ci -m "Add file $a" done cd ../.. cd tags/will-edit svn rm alpha svn ci -m 'removed alpha on a tag. Moves tag, implicit branch.' cd ../.. cd branches/magic for a in omega; do echo $a > $a svn add $a svn ci -m "Add file $a" done cd ../.. svn up svn cp $REPOPATH/branches/magic $REPOPATH/tags/also-edit -m 'Make tag to edit' svn up echo not omega > branches/magic/omega echo not omega > tags/also-edit/omega svn ci -m 'edit both the tag and its source branch at the same time' echo more stupidity > tags/also-edit/omega svn ci -m 'Edit an edited tag.' svn cp $REPOPATH/tags/also-edit $REPOPATH/tags/did-edits -m 'Tag an edited tag' svn cp $REPOPATH/branches/magic $REPOPATH/branches/closeme -m 'Make extra branch for another bogus case' svn cp $REPOPATH/branches/closeme $REPOPATH/tags/edit-later -m 'Make tag to edit after branch closes' svn rm $REPOPATH/branches/closeme -m 'Close the branch' svn up echo boofar > tags/edit-later/delta svn ci -m 'Edit this tag after its parent closed' # try and revert will-edit to its original state svn up svn merge -r9:8 $REPOPATH . svn ci -m 'Revert revision 9.' # make a tag from a branch and edit it at the same time svn up svn cp branches/magic tags/edit-at-create echo alpha >> tags/edit-at-create/alpha svn ci -m 'make a tag from a branch and edit it at the same time' cd ../.. svnadmin dump temp/repo > commit-to-tag.svndump echo echo 'Complete.' echo 'You probably want to clean up temp now.' echo 'Dump in commit-to-tag.svndump' exit 0