Mercurial > hg
view tests/test-issue2137.t @ 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 | a421459b83c0 |
children | 2fc86d92c4a9 |
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http://mercurial.selenic.com/bts/issue2137 Setup: create a little extension that has 3 side-effects: 1) ensure changelog data is not inlined 2) make revlog to use lazyparser 3) test that repo.lookup() works 1 and 2 are preconditions for the bug; 3 is the bug. $ cat > commitwrapper.py <<EOF > from mercurial import extensions, node, revlog > > def reposetup(ui, repo): > class wraprepo(repo.__class__): > def commit(self, *args, **kwargs): > result = super(wraprepo, self).commit(*args, **kwargs) > tip1 = node.short(repo.changelog.tip()) > tip2 = node.short(repo.lookup(tip1)) > assert tip1 == tip2 > ui.write('new tip: %s\n' % tip1) > return result > repo.__class__ = wraprepo > > def extsetup(ui): > revlog._maxinline = 8 # split out 00changelog.d early > revlog._prereadsize = 8 # use revlog.lazyparser > EOF $ cat >> $HGRCPATH <<EOF > [extensions] > commitwrapper = `pwd`/commitwrapper.py > EOF $ hg init repo1 $ cd repo1 $ echo a > a $ hg commit -A -m'add a with a long commit message to make the changelog a bit bigger' adding a new tip: 553596fad57b Test that new changesets are visible to repo.lookup(): $ echo a >> a $ hg commit -m'one more commit to demonstrate the bug' new tip: 799ae3599e0e $ hg tip changeset: 1:799ae3599e0e tag: tip user: test date: Thu Jan 01 00:00:00 1970 +0000 summary: one more commit to demonstrate the bug $ cd ..