Mercurial > hg-stable
changeset 20446:d258486604f4
revset: changed limit revset implementation to work with lazy revsets
Performance benchmarking:
$ time hg log -qr "first(branch(default))"
0:9117c6561b0b
real 0m3.130s
user 0m3.025s
sys 0m0.074s
$ time ./hg log -qr "first(branch(default))"
0:9117c6561b0b
real 0m0.300s
user 0m0.198s
sys 0m0.069s
| author | Lucas Moscovicz <lmoscovicz@fb.com> |
|---|---|
| date | Tue, 28 Jan 2014 16:19:30 -0800 |
| parents | 507261c0914f |
| children | abb91b74f758 |
| files | mercurial/revset.py |
| diffstat | 1 files changed, 11 insertions(+), 2 deletions(-) [+] |
line wrap: on
line diff
--- a/mercurial/revset.py Wed Feb 05 16:12:03 2014 -0800 +++ b/mercurial/revset.py Tue Jan 28 16:19:30 2014 -0800 @@ -944,8 +944,17 @@ # i18n: "limit" is a keyword raise error.ParseError(_("limit expects a number")) ss = subset.set() - os = getset(repo, baseset(repo), l[0])[:lim] - return baseset([r for r in os if r in ss]) + os = getset(repo, baseset(repo), l[0]) + bs = baseset([]) + it = iter(os) + for x in xrange(lim): + try: + y = it.next() + if y in ss: + bs.append(y) + except (StopIteration): + break + return bs def last(repo, subset, x): """``last(set, [n])``