Mercurial > public > mercurial-scm > hg-stable
diff mercurial/branchmap.py @ 24159:5b4ed033390b stable 3.3.1
revisionbranchcache: fall back to slow path if starting readonly (issue4531)
Transitioning to Mercurial versions with revision branch cache could be slow as
long as all operations were readonly (revset queries) and the cache would be
populated but not written back.
Instead, fall back to using the consistently slow path when readonly and the
cache doesn't exist yet. That avoids the overhead of populating the cache
without writing it back.
If not readonly, it will still populate all missing entries initially. That
avoids repeated writing of the cache file with small updates, and it also makes
sure a fully populated cache available for the readonly operations.
| author | Mads Kiilerich <madski@unity3d.com> |
|---|---|
| date | Fri, 06 Feb 2015 02:52:10 +0100 |
| parents | 7cc77030c557 |
| children | bb11081562d7 |
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--- a/mercurial/branchmap.py Thu Feb 26 06:03:39 2015 +0900 +++ b/mercurial/branchmap.py Fri Feb 06 02:52:10 2015 +0100 @@ -330,7 +330,7 @@ and will grow with it but be 1/8th of its size. """ - def __init__(self, repo): + def __init__(self, repo, readonly=True): assert repo.filtername is None self._names = [] # branch names in local encoding with static index self._rbcrevs = array('c') # structs of type _rbcrecfmt @@ -342,6 +342,10 @@ except (IOError, OSError), inst: repo.ui.debug("couldn't read revision branch cache names: %s\n" % inst) + if readonly: + # don't try to use cache - fall back to the slow path + self.branchinfo = self._branchinfo + if self._names: try: data = repo.vfs.read(_rbcrevs)