Mercurial > hgsubversion
view tests/fixtures/externals.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 | a5be5ca638de |
children |
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#!/bin/sh # # Generate externals.svndump # mkdir temp cd temp mkdir project-orig cd project-orig mkdir trunk mkdir branches mkdir externals cd .. svnadmin create testrepo svnurl=file://`pwd`/testrepo svn import project-orig $svnurl -m "init project" svn co $svnurl project cd project/externals mkdir project1 echo a > project1/a svn add project1 mkdir project2 echo a > project2/b svn add project2 svn ci -m "configure externals projects" cd ../trunk # Add an external reference echo a > a svn add a cat > externals <<EOF ^/externals/project1 deps/project1 EOF svn propset -F externals svn:externals . svn ci -m "set externals on ." # Add another one cat > externals <<EOF # A comment, then an empty line, then a blank line ^/externals/project1 deps/project1 -r2 ^/externals/project2@2 deps/project2 EOF svn propset -F externals svn:externals . svn ci -m "update externals on ." # Suppress an external and add one on a subdir cat > externals <<EOF -r2 ^/externals/project2@2 deps/project2 EOF svn propset -F externals svn:externals . mkdir subdir mkdir subdir2 svn add subdir subdir2 cat > externals <<EOF ^/externals/project1 deps/project1 EOF svn propset -F externals svn:externals subdir subdir2 svn ci -m "add on subdir" # Test branch with externals svn up cd ../branches svn copy ../trunk branch1 svn propdel svn:externals branch1/subdir2 svn ci -m 'externals in subtree' # Test branch with externals, removing on copy root svn copy ../trunk branch2 svn propdel svn:externals branch2 branch2/subdir2 svn ci -m 'externals in subtree, removed on root' cd ../trunk # Suppress the subdirectory svn rm --force subdir svn ci -m 'remove externals subdir' # Remove the property on subdir2 svn propdel svn:externals subdir2 svn ci -m 'remove externals subdir2' # Kill project2 externals, peg revision should preserve it cd .. svn up svn rm externals/project2 svn ci -m 'remove externals project2' cd trunk echo a >> a svn ci -m 'change a' cd ../.. svnadmin dump testrepo > ../externals.svndump