revlog: break up compression of large deltas
Python's zlib apparently makes an internal copy of strings passed to
compress(). To avoid this, compress strings 1M at a time, then join
them at the end if the result would be smaller than the original.
For initial commits of large but compressible files, this cuts peak
memory usage nearly in half.
#!/bin/sh
"$TESTDIR/hghave" symlink || exit 80
origdir=`pwd`
cat >> readlink.py <<EOF
import os
import sys
for f in sys.argv[1:]:
print f, '->', os.readlink(f)
EOF
hg init repo
cd repo
ln -s nothing dangling
hg ci -qAm 'add symlink'
hg archive -t files ../archive
hg archive -t tar -p tar ../archive.tar
hg archive -t zip -p zip ../archive.zip
echo '% files'
cd "$origdir"
cd archive
python ../readlink.py dangling
echo '% tar'
cd "$origdir"
tar xf archive.tar
cd tar
python ../readlink.py dangling
echo '% zip'
cd "$origdir"
unzip archive.zip > /dev/null
cd zip
python ../readlink.py dangling