findrenames: Optimise "addremove -s100" by matching files by their SHA1 hashes.
We speed up 'findrenames' for the usecase when a user specifies they
want a similarity of 100% by matching files by their exact SHA1 hash
value. This reduces the number of comparisons required to find exact
matches from O(n^2) to O(n).
While it would be nice if we could just use mercurial's pre-calculated
SHA1 hash for existing files, this hash includes the file's ancestor
information making it unsuitable for our purposes. Instead, we calculate
the hash of old content from scratch.
The following benchmarks were taken on the current head of crew:
addremove 100% similarity:
rm -rf *; hg up -C; mv tests tests.new
hg --time addremove -s100 --dry-run
before: real 176.350 secs (user 128.890+0.000 sys 47.430+0.000)
after: real 2.130 secs (user 1.890+0.000 sys 0.240+0.000)
addremove 75% similarity:
rm -rf *; hg up -C; mv tests tests.new; \
for i in tests.new/*; do echo x >> $i; done
hg --time addremove -s75 --dry-run
before: real 264.560 secs (user 215.130+0.000 sys 49.410+0.000)
after: real 218.710 secs (user 172.790+0.000 sys 45.870+0.000)
#!/bin/sh
# test stripping of filelogs where the linkrev doesn't always increase
echo '[extensions]' >> $HGRCPATH
echo 'hgext.mq =' >> $HGRCPATH
hg init orig
cd orig
hidefilename()
{
sed -e 's/saving bundle to .*strip-backup/saving bundle to strip-backup/'
}
commit()
{
hg up -qC null
count=1
for i in "$@"; do
for f in $i; do
echo $count > $f
done
count=`expr $count + 1`
done
hg commit -qAm "$*"
}
# 2 1 0 2 0 1 2
commit '201 210'
commit '102 120' '210'
commit '021'
commit '201' '021 120'
commit '012 021' '102 201' '120 210'
commit 'manifest-file'
commit '102 120' '012 210' '021 201'
commit '201 210' '021 120' '012 102'
HGUSER=another-user; export HGUSER
commit 'manifest-file'
commit '012' 'manifest-file'
cd ..
hg clone -q -U -r -1 -r -2 -r -3 -r -4 -r -6 orig crossed
for i in crossed/.hg/store/00manifest.i crossed/.hg/store/data/*.i; do
echo $i
hg debugindex $i
echo
done
for i in 0 1 2 3 4; do
hg clone -q -U --pull crossed $i
echo "% Trying to strip revision $i"
hg --cwd $i strip $i 2>&1 | hidefilename
echo "% Verifying"
hg --cwd $i verify
echo
done