[PATCH evolve-ext] inhibit: improve transaction marker perf
Gregory Szorc
gregory.szorc at gmail.com
Sun Nov 8 10:28:00 CST 2015
On Sat, Nov 7, 2015 at 5:20 PM, Durham Goode <durham at fb.com> wrote:
> # HG changeset patch
> # User Durham Goode <durham at fb.com>
> # Date 1446945001 28800
> # Sat Nov 07 17:10:01 2015 -0800
> # Node ID 7c680f209f7af35c7c476eecc2f9eec13b32ad62
> # Parent 48547b4c77defdd17c670b1eb0eb94272edf0207
> inhibit: improve transaction marker perf
>
> The old algorithm was a revset "::X and obsolete()". This was inefficient
> because
> it requires walking all the way down the ancestor chain (since the revset
> did
> not know it could stop walking at public nodes).
>
> The new algorithm uses changelog.ancestors() directly and provides a
> function to
> stop the iteration when we reach a public node. During a commit to a repo
> with
> hundreds of thousands of commits, this change reduces the inhibitmarkers
> time
> from 1.5 seconds to effectively 0 seconds.
>
> diff --git a/hgext/inhibit.py b/hgext/inhibit.py
> --- a/hgext/inhibit.py
> +++ b/hgext/inhibit.py
> @@ -23,6 +23,7 @@ from mercurial import scmutil
> from mercurial import commands
> from mercurial import lock as lockmod
> from mercurial import bookmarks
> +from mercurial import phases
> from mercurial import util
> from mercurial.i18n import _
>
> @@ -129,7 +130,15 @@ def _inhibitmarkers(repo, nodes):
> if not _inhibitenabled(repo):
> return
>
> - newinhibit = repo.set('::%ln and obsolete()', nodes)
> + newinhibit = set()
> + revs = [repo[node].rev() for node in nodes]
> + phase = repo._phasecache.phase
> + obsoletes = obsolete.getrevs(repo, 'obsolete')
> + for anc in repo.changelog.ancestors(revs, inclusive=True,
> + stopfunc=lambda rev: phase(repo, rev) == phases.public):
> + if anc in obsoletes:
> + newinhibit.add(repo[anc])
> +
>
>
I must be missing something obvious: why can't this be written as:
obsoletes = ...
for rev in repo.revs('::%ln and not public()'):
if rev in obsoletes:
...
I don't understand why stopfunc is needed and why a revset can't do the
same thing.
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