Mercurial > hgsubversion
view tests/fixtures/branch_prop_edit.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 | cf6fe8457570 |
children |
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#!/bin/sh mkdir temp cd temp svnadmin create repo svn co file://`pwd`/repo wc cd wc mkdir branches trunk svn add * svn ci -m 'branches trunk' svn up cd trunk for a in alpha beta gamma ; do echo $a > $a svn add $a done svn ci -m 'Files.' cd .. svn up svn cp trunk branches/dev_branch svn ci -m 'make a branch' svn up cd branches/dev_branch echo epsilon > epsilon svn add epsilon svn ci -m 'Add a file on the branch.' svn up cd ../.. cd branches/dev_branch svn ps 'svn:ignore' 'delta' . svn ci -m 'Commit bogus propchange.' svn up cd ../../.. pwd svnadmin dump repo > ../branch_prop_edit.svndump cd .. echo 'Dump created in branch_prop_edit.svndump. You can probably delete temp.' exit 0