Mercurial > hg
view mercurial/help/hgignore.5.txt @ 42237:9f45d3d526f9
hgtagsfnodescache: inherit fnode from parent when possible
If a changeset does not update the content of `.hgtags`, it means it will use
the same file-node (for `.hgtags`) as its parents. In this case we can
directly reuse the parent's file-node.
We use this property when updating the `hgtagsfnodescache` taking a faster path
if we already have a cached value for the parents of the node we are looking
at.
Doing so provides a large performance boost when looking at a lot of fnodes,
especially on repository with very large manifest:
timing for `tagsmod.fnoderevs(ui, repo, repo.changelog.revs())`
mercurial: (41907 revisions, 1923 files)
before: 6.9 seconds
after: 2.7 seconds (-54%)
pypy: (96266 revisions, 5198 files)
before: 80 seconds
after: 20 seconds (-75%)
mozilla-central: (463411 revisions, 272080 files)
before: 7166.4 seconds
after: 47.8 seconds (-99%, x150 speedup)
On a copy of mozilla-try with about 35K heads ans 1.7M changesets, this moves
the computation from many hours to a couple of minutes, making it more
interesting to do a full warm up of this cache before computing tags (from a
cold cache).
There seems to be other performance low hanging fruits, like avoiding the use of
changectx or a more revision centric logic. However, the new code is fast enough
for my needs right now.
| author | Pierre-Yves David <pierre-yves.david@octobus.net> |
|---|---|
| date | Mon, 11 Mar 2019 01:10:20 +0100 |
| parents | 8427fea04017 |
| children |
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========== hgignore ========== --------------------------------- syntax for Mercurial ignore files --------------------------------- :Author: Vadim Gelfer <vadim.gelfer@gmail.com> :Organization: Mercurial :Manual section: 5 :Manual group: Mercurial Manual .. include:: hgignore.5.gendoc.txt Author ====== Vadim Gelfer <vadim.gelfer@gmail.com> Mercurial was written by Matt Mackall <mpm@selenic.com>. See Also ======== |hg(1)|_, |hgrc(5)|_ Copying ======= This manual page is copyright 2006 Vadim Gelfer. Mercurial is copyright 2005-2019 Matt Mackall. Free use of this software is granted under the terms of the GNU General Public License version 2 or any later version. .. include:: common.txt