Mercurial > hgsubversion
view tests/fixtures/symlinks.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 | b37c401b7f92 |
children |
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#!/bin/sh # # Generate symlinks.svndump # mkdir temp cd temp mkdir project-orig cd project-orig mkdir trunk mkdir branches cd .. svnadmin create testrepo svnurl=file://`pwd`/testrepo svn import project-orig $svnurl -m "init project" svn co $svnurl project cd project/trunk echo a > a ln -s a linka ln -s a linka2 mkdir d ln -s a d/linka svn add a linka linka2 d svn ci -m "add symlinks" # Move symlinks svn mv linka linkaa svn mv d d2 svn commit -m "moving symlinks" # Update symlinks (test "link " prefix vs applydelta) echo b > b rm linkaa ln -s b linkaa rm d2/linka ln -s b d2/linka svn ci -m "update symlinks" # Replace a symlink with a regular file rm linkaa echo data > linkaa svn propdel svn:special linkaa # Replace another symlink with a regular file in another way # It should mark linka2 as R(eplaced) svn rm linka2 echo data2 > linka2 svn add linka2 svn propdel svn:special linka2 svn rm d2/linka svn ci -m "undo link" cd ../.. svnadmin dump testrepo > ../symlinks.svndump