bisect: avoid copying ancestor list for non-merge commits
During a bisection, hg needs to compute a list of all ancestors for every
candidate commit. This is accomplished via a bottom-up traversal of the set of
candidates, during which each revision's ancestor list is populated using the
ancestor list of its parent(s). Previously, this involved copying the entire
list, which could be very long in if the bisection range was large.
To help improve this, we can observe that each candidate commit is visited
exactly once, at which point its ancestor list is copied into its children's
lists and then dropped. In the case of non-merge commits, a commit's ancestor
list consists exactly of its parent's list plus itself. This means that we can
trivially reuse the parent's existing list for one of its non-merge children,
which avoids copying entirely if that commit is the parent's only child. This
makes bisections over linear ranges of commits much faster.
During some informal testing in the large publicly-available `mozilla-central`
repository, this noticeably sped up bisections over large ranges of history:
Setup:
$ cd mozilla-central
$ hg bisect --reset
$ hg bisect --good 0
$ hg log -r tip -T '{rev}\n'
628417
Test:
$ time hg bisect --bad tip --noupdate
Before:
real 3m35.927s
user 3m35.553s
sys 0m0.319s
After:
real 1m41.142s
user 1m40.810s
sys 0m0.285s
# setup config and various utility to test new heads checks on push
cat >> $HGRCPATH <<EOF
[command-templates]
# simpler log output
log ="{node|short} ({phase}): {desc}\n"
[phases]
# non publishing server
publish=False
[extensions]
# we need to strip some changeset for some test cases
strip=
[experimental]
# enable evolution
evolution=all
[alias]
# fix date used to create obsolete markers.
debugobsolete=debugobsolete -d '0 0'
EOF
mkcommit() {
echo "$1" > "$1"
hg add "$1"
hg ci -m "$1"
}
getid() {
hg log --hidden --template '{node}\n' --rev "$1"
}
setuprepos() {
echo creating basic server and client repo
hg init server
cd server
mkcommit root
hg phase --public .
mkcommit A0
cd ..
hg clone server client
if [ "$1" = "single-head" ]; then
echo >> "server/.hg/hgrc" "[experimental]"
echo >> "server/.hg/hgrc" "# enforce a single name per branch"
echo >> "server/.hg/hgrc" "single-head-per-branch = yes"
fi
}