changeset 20713:6a1a4c212d50

revset: improve head revset performance Previously the head() revset would iterate over every item in the subset and check if it was a head. Since the subset is often the entire repo, this was slow on large repos. Now we iterate over each item in the head list and check if it's in the subset, which results in much less work. hg log -r 'head()' on a large repo: Before: 0.95s After: 0.28s
author Durham Goode <durham@fb.com>
date Thu, 13 Mar 2014 13:47:21 -0700
parents c152e538b85b
children 41e1064486f9
files mercurial/revset.py
diffstat 1 files changed, 1 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/mercurial/revset.py	Tue Mar 11 16:52:15 2014 -0700
+++ b/mercurial/revset.py	Thu Mar 13 13:47:21 2014 -0700
@@ -940,7 +940,7 @@
     hs = set()
     for b, ls in repo.branchmap().iteritems():
         hs.update(repo[h].rev() for h in ls)
-    return subset.filter(lambda r: r in hs)
+    return baseset(hs).filter(subset.__contains__)
 
 def heads(repo, subset, x):
     """``heads(set)``