Mercurial > hgsubversion
view tests/fixtures/renamedproject.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 | 942f198b8ff5 |
children |
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#!/bin/sh # # Convert a project moving from a non-canonical to canonical # layout, exercizing the missing plaintext code paths. It also tests # branch creations where the branch source is not a canonical branch. # mkdir temp cd temp svnadmin create testrepo svnurl=file://`pwd`/testrepo mkdir project-orig cd project-orig echo a > a echo b > b echo c > c mkdir d echo a > d/a cd .. # Let's suppose it was actually branched in a previous life mkdir project-branch cd project-branch echo a > a echo b > b cd .. svn import project-orig $svnurl/project-orig -m "init project" svn import project-branch $svnurl/project-branch -m "init branch" svn mkdir $svnurl/project -m "create new project hierarchy" svn mv $svnurl/project-orig $svnurl/project/project -m "rename as project" svn mv $svnurl/project/project $svnurl/project/trunk -m "rename as project" svn mkdir $svnurl/project/branches -m "add branches root" svn mv $svnurl/project-branch $svnurl/project/misplaced -m "incorrect move of the branch" svn mv $svnurl/project/misplaced $svnurl/project/branches/branch -m "move of the branch" svn co $svnurl/project cd project echo a >> trunk/a svn ci -m "change a" echo a >> trunk/a echo b >> trunk/b svn rm trunk/c echo a >> trunk/d/a svn ci -m "change files in trunk" # Try the same thing with the branch echo a >> branches/branch/a svn rm branches/branch/b svn ci -m "change a in branch" cd .. # Add this to make test_rebuildmeta happy, needs something to convert svn import project-orig $svnurl/trunk -m "init fake trunk for rebuild_meta" svnadmin dump testrepo > ../renamedproject.svndump