localrepo: micro-optimize __len__() to bypass repoview
Since len(changelog) isn't overridden, we don't have to validate a cache of
unfiltered changelog.
$ python -m timeit -n 10000 \
-s 'from mercurial import hg, ui; repo = hg.repository(ui.ui());' \
'len(repo)'
orig) 10000 loops, best of 3: 32.1 usec per loop
new) 10000 loops, best of 3: 1.79 usec per loop
Spotted by Jordi Gutiérrez Hermoso.
--- a/mercurial/localrepo.py Thu Jan 18 21:18:10 2018 -0500
+++ b/mercurial/localrepo.py Fri Jan 19 21:39:11 2018 +0900
@@ -762,7 +762,9 @@
__bool__ = __nonzero__
def __len__(self):
- return len(self.changelog)
+ # no need to pay the cost of repoview.changelog
+ unfi = self.unfiltered()
+ return len(unfi.changelog)
def __iter__(self):
return iter(self.changelog)