view tests/test-merge10 @ 5451:0a43875677b1

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

# Test for changeset 9fe267f77f56ff127cf7e65dc15dd9de71ce8ceb
# (merge correctly when all the files in a directory are moved
# but then local changes are added in the same directory)

hg init a
cd a
mkdir -p testdir
echo a > testdir/a
hg add testdir/a
hg commit -u test -d '1000000 0' -m a
cd ..

hg clone a b
cd a
echo alpha > testdir/a
hg commit -u test -d '1000000 0' -m remote-change
cd ..

cd b
mkdir testdir/subdir
hg mv testdir/a testdir/subdir/a
hg commit -u test -d '1000000 0' -m move
mkdir newdir
echo beta > newdir/beta
hg add newdir/beta
hg commit -u test -d '1000000 0' -m local-addition
hg pull ../a
hg up -C 2
hg merge
hg stat
hg diff --nodates