Mercurial > hg
view tests/test-changelog-exec.t @ 17970:0b03454abae7
ancestor: faster algorithm for difference of ancestor sets
One of the major reasons rebase is slow in large repositories is
the computation of the detach set: the set of ancestors of the
changesets to rebase not in the destination parent. This is currently
done via a revset that does two walks all the way to the root of
the DAG. Instead of doing that, to find ancestors of a set <revs>
not in another set <common> we walk up the tree in reverse revision
number order, maintaining sets of nodes visited from <revs>, <common>
or both.
For the common case where the sets are close both topologically and
in revision number (relative to repository size), this has been
found to speed up rebase by around 15-20%. When the nodes are farther
apart and the DAG is highly branching, it is harder to say which
would win.
Here's how long computing the detach set takes in a linear repository
with over 400000 changesets, rebasing near tip:
Rebasing across 4 changesets
Revset method: 2.2s
New algorithm: 0.00015s
Rebasing across 250 changesets
Revset method: 2.2s
New algorithm: 0.00069s
Rebasing across 10000 changesets
Revset method: 2.4s
New algorithm: 0.019s
author | Siddharth Agarwal <sid0@fb.com> |
---|---|
date | Mon, 26 Nov 2012 11:46:51 -0800 |
parents | b87acfda5268 |
children | 7a9cbb315d84 d5261db0011f |
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b51a8138292a introduced a regression where we would mention in the changelog executable files added by the second parent of a merge. Test that that doesn't happen anymore $ "$TESTDIR/hghave" execbit || exit 80 $ hg init repo $ cd repo $ echo foo > foo $ hg ci -qAm 'add foo' $ echo bar > bar $ chmod +x bar $ hg ci -qAm 'add bar' manifest of p2: $ hg manifest bar foo $ hg up -qC 0 $ echo >> foo $ hg ci -m 'change foo' created new head manifest of p1: $ hg manifest foo $ hg merge 1 files updated, 0 files merged, 0 files removed, 0 files unresolved (branch merge, don't forget to commit) $ hg ci -m 'merge' this should not mention bar: $ hg tip -v changeset: 3:ef2fc9b4a51b tag: tip parent: 2:ed1b79f46b9a parent: 1:d394a8db219b user: test date: Thu Jan 01 00:00:00 1970 +0000 description: merge $ hg debugindex bar rev offset length ..... linkrev nodeid p1 p2 (re) 0 0 5 ..... 1 b004912a8510 000000000000 000000000000 (re) $ cd ..