Mercurial > hg-stable
changeset 22669:00c8abe64cf3
revset: prefetch an attribute in _generatorset.__iter__
Python's attribute lookup are expensible, lets do less of them.
This gives us a 7% speedup on this revset iteration (from 0.063403 to 0.059032)
| author | Pierre-Yves David <pierre-yves.david@fb.com> |
|---|---|
| date | Thu, 18 Sep 2014 15:52:45 -0700 |
| parents | 13e3f07d74a3 |
| children | 44dce874de97 |
| files | mercurial/revset.py |
| diffstat | 1 files changed, 4 insertions(+), 3 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/revset.py Tue Sep 09 22:14:13 2014 +0900 +++ b/mercurial/revset.py Thu Sep 18 15:52:45 2014 -0700 @@ -2667,12 +2667,13 @@ # iteration. i = 0 genlist = self._genlist - consume = self._consumegen() + nextrev = self._consumegen().next + _len = len # cache global lookup while True: - if i < len(genlist): + if i < _len(genlist): yield genlist[i] else: - yield consume.next() + yield nextrev() i += 1 def _consumegen(self):