obsolete: skip 'changectx' usage in unstable computation
We simplify the unstable computation code, skipping the expensive creation of
changectx object. We focus on efficient set operation and revnumber centric
functions.
In my mercurial development repository, this provides a 3x speedup to the
function:
before: 5.319 ms
after: 1.844 ms
repo details:
total changesets: 40886
obsolete changesets: 7756
mutable (not obsolete): 293
unstable: 30
--- a/mercurial/obsolete.py Sun Jun 18 22:38:11 2017 +0200
+++ b/mercurial/obsolete.py Mon Jun 19 01:08:11 2017 +0200
@@ -1325,16 +1325,18 @@
@cachefor('unstable')
def _computeunstableset(repo):
"""the set of non obsolete revisions with obsolete parents"""
- revs = [(ctx.rev(), ctx) for ctx in
- repo.set('(not public()) and (not obsolete())')]
- revs.sort(key=lambda x:x[0])
+ pfunc = repo.changelog.parentrevs
+ mutable = _mutablerevs(repo)
+ obsolete = getrevs(repo, 'obsolete')
+ others = mutable - obsolete
unstable = set()
- for rev, ctx in revs:
+ for r in sorted(others):
# A rev is unstable if one of its parent is obsolete or unstable
# this works since we traverse following growing rev order
- if any((x.obsolete() or (x.rev() in unstable))
- for x in ctx.parents()):
- unstable.add(rev)
+ for p in pfunc(r):
+ if p in obsolete or p in unstable:
+ unstable.add(r)
+ break
return unstable
@cachefor('suspended')