# HG changeset patch # User Mads Kiilerich # Date 2015-01-07 23:01:03 # Node ID 7d63398fbfd1b3f8693e46035c9058b6cfb824aa # Parent cb99bacb9b4e1b161e28a7d47c1c7f87df2d463f branchmap: use revbranchcache when updating branch map The revbranchcache is read on demand before it will be used for updating the branch map. It is written back when the branchmap is written and it will thus use the same locking as branchmap. The revbranchcache instance is short-lived; it is only stored in the branchmap from .update() is invoked and until .write() is invoked. Branchmap already assume that the repo is locked in that case. The use of revbranchcache for branch map updates will make sure that the revbranchcache "always" is kept up-to-date. The perfbranchmap benchmark is somewhat bogus, especially when we can see that the caching makes a significant difference between the realistic case of a first run and the rare case of rerunning it with a full cache. Here are some 'base' numbers on mozilla-central: Before: ! wall 6.912745 comb 6.910000 user 6.840000 sys 0.070000 (best of 3) After - initial, cache is empty: ! wall 7.792569 comb 7.790000 user 7.720000 sys 0.070000 (best of 3) After - cache is full: ! wall 0.879688 comb 0.880000 user 0.870000 sys 0.010000 (best of 4) The overhead when running with empty cache comes from checking, missing and updating it every time. Most of the performance improvement comes from not having to extract the branch info from the changelog. The last doubling of performance comes from no longer having to convert all branch names to local encoding but reuse the few already converted branch names. On the hg repo: Before: ! wall 0.715703 comb 0.710000 user 0.710000 sys 0.000000 (best of 14) After: ! wall 0.105489 comb 0.110000 user 0.110000 sys 0.000000 (best of 87) diff --git a/mercurial/branchmap.py b/mercurial/branchmap.py --- a/mercurial/branchmap.py +++ b/mercurial/branchmap.py @@ -134,6 +134,7 @@ class branchcache(dict): self._closednodes = set() else: self._closednodes = closednodes + self._revbranchcache = None def _hashfiltered(self, repo): """build hash of revision filtered in the current cache @@ -225,6 +226,9 @@ class branchcache(dict): repo.ui.debug("couldn't write branch cache: %s\n" % inst) # Abort may be raise by read only opener pass + if self._revbranchcache: + self._revbranchcache.write(repo.unfiltered()) + self._revbranchcache = None def update(self, repo, revgen): """Given a branchhead cache, self, that may have extra nodes or be @@ -235,9 +239,12 @@ class branchcache(dict): cl = repo.changelog # collect new branch entries newbranches = {} - getbranchinfo = cl.branchinfo + urepo = repo.unfiltered() + self._revbranchcache = revbranchcache(urepo) + getbranchinfo = self._revbranchcache.branchinfo + ucl = urepo.changelog for r in revgen: - branch, closesbranch = getbranchinfo(r) + branch, closesbranch = getbranchinfo(ucl, r) newbranches.setdefault(branch, []).append(r) if closesbranch: self._closednodes.add(cl.node(r)) @@ -361,7 +368,7 @@ class revbranchcache(object): self._rbcrevs.extend('\0' * (len(changelog) * _rbcrecsize - len(self._rbcrevs))) for r in xrange(first, len(changelog)): - self._branchinfo(r) + self._branchinfo(changelog, r) # fast path: extract data from cache, use it if node is matching reponode = changelog.node(rev)[:_rbcnodelen] @@ -374,7 +381,7 @@ class revbranchcache(object): return self._names[branchidx], close # fall back to slow path and make sure it will be written to disk self._rbcrevslen = min(self._rbcrevslen, rev) - return self._branchinfo(rev) + return self._branchinfo(changelog, rev) def _branchinfo(self, changelog, rev): """Retrieve branch info from changelog and update _rbcrevs""" diff --git a/tests/test-clone.t b/tests/test-clone.t --- a/tests/test-clone.t +++ b/tests/test-clone.t @@ -31,6 +31,8 @@ Trigger branchcache creation: default 10:a7949464abda $ ls .hg/cache branch2-served + rbc-names-v1 + rbc-revs-v1 Default operation: diff --git a/tests/test-convert-svn-encoding.t b/tests/test-convert-svn-encoding.t --- a/tests/test-convert-svn-encoding.t +++ b/tests/test-convert-svn-encoding.t @@ -53,6 +53,7 @@ Convert while testing all possible outpu source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@1 converting: 0/6 revisions (0.00%) committing changelog + couldn't read revision branch cache names: * (glob) 4 hello source: svn:afeb9c47-92ff-4c0c-9f72-e1f6eb8ac9af/trunk@2 converting: 1/6 revisions (16.67%) diff --git a/tests/test-fncache.t b/tests/test-fncache.t --- a/tests/test-fncache.t +++ b/tests/test-fncache.t @@ -71,6 +71,8 @@ Non store repo: .hg/00manifest.i .hg/cache .hg/cache/branch2-served + .hg/cache/rbc-names-v1 + .hg/cache/rbc-revs-v1 .hg/data .hg/data/tst.d.hg .hg/data/tst.d.hg/foo.i @@ -99,6 +101,8 @@ Non fncache repo: .hg/00changelog.i .hg/cache .hg/cache/branch2-served + .hg/cache/rbc-names-v1 + .hg/cache/rbc-revs-v1 .hg/dirstate .hg/last-message.txt .hg/requires diff --git a/tests/test-hardlinks.t b/tests/test-hardlinks.t --- a/tests/test-hardlinks.t +++ b/tests/test-hardlinks.t @@ -196,6 +196,8 @@ r4 has hardlinks in the working dir (not 2 r4/.hg/00changelog.i 2 r4/.hg/branch 2 r4/.hg/cache/branch2-served + 2 r4/.hg/cache/rbc-names-v1 + 2 r4/.hg/cache/rbc-revs-v1 2 r4/.hg/dirstate 2 r4/.hg/hgrc 2 r4/.hg/last-message.txt @@ -226,6 +228,8 @@ Update back to revision 11 in r4 should 2 r4/.hg/00changelog.i 1 r4/.hg/branch 2 r4/.hg/cache/branch2-served + 2 r4/.hg/cache/rbc-names-v1 + 2 r4/.hg/cache/rbc-revs-v1 1 r4/.hg/dirstate 2 r4/.hg/hgrc 2 r4/.hg/last-message.txt diff --git a/tests/test-inherit-mode.t b/tests/test-inherit-mode.t --- a/tests/test-inherit-mode.t +++ b/tests/test-inherit-mode.t @@ -66,6 +66,8 @@ new directories are setgid 00600 ./.hg/00changelog.i 00770 ./.hg/cache/ 00660 ./.hg/cache/branch2-served + 00660 ./.hg/cache/rbc-names-v1 + 00660 ./.hg/cache/rbc-revs-v1 00660 ./.hg/dirstate 00660 ./.hg/last-message.txt 00600 ./.hg/requires @@ -111,6 +113,8 @@ group can still write everything 00660 ../push/.hg/00changelog.i 00770 ../push/.hg/cache/ 00660 ../push/.hg/cache/branch2-base + 00660 ../push/.hg/cache/rbc-names-v1 + 00660 ../push/.hg/cache/rbc-revs-v1 00660 ../push/.hg/requires 00770 ../push/.hg/store/ 00660 ../push/.hg/store/00changelog.i