Mercurial > hg
view tests/test-branch-option.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 | 41885892796e |
children | 701df761aa94 |
line wrap: on
line source
test branch selection options $ hg init branch $ cd branch $ hg branch a marked working directory as branch a (branches are permanent and global, did you want a bookmark?) $ echo a > foo $ hg ci -d '0 0' -Ama adding foo $ echo a2 > foo $ hg ci -d '0 0' -ma2 $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch c marked working directory as branch c (branches are permanent and global, did you want a bookmark?) $ echo c > foo $ hg ci -d '0 0' -mc $ hg tag -l z $ cd .. $ hg clone -r 0 branch branch2 adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files updating to branch a 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ cd branch2 $ hg up 0 0 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch b marked working directory as branch b (branches are permanent and global, did you want a bookmark?) $ echo b > foo $ hg ci -d '0 0' -mb $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg --encoding utf-8 branch æ marked working directory as branch \xc3\xa6 (esc) (branches are permanent and global, did you want a bookmark?) $ echo ae1 > foo $ hg ci -d '0 0' -mae1 $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg --encoding utf-8 branch -f æ marked working directory as branch \xc3\xa6 (esc) (branches are permanent and global, did you want a bookmark?) $ echo ae2 > foo $ hg ci -d '0 0' -mae2 created new head $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg branch -f b marked working directory as branch b (branches are permanent and global, did you want a bookmark?) $ echo b2 > foo $ hg ci -d '0 0' -mb2 created new head unknown branch and fallback $ hg in -qbz abort: unknown branch 'z'! [255] $ hg in -q ../branch#z 2:f25d57ab0566 $ hg out -qbz abort: unknown branch 'z'! [255] in rev c branch a $ hg in -qr c ../branch#a 1:dd6e60a716c6 2:f25d57ab0566 $ hg in -qr c -b a 1:dd6e60a716c6 2:f25d57ab0566 out branch . $ hg out -q ../branch#. 1:b84708d77ab7 4:65511d0e2b55 $ hg out -q -b . 1:b84708d77ab7 4:65511d0e2b55 out branch . non-ascii $ hg --encoding utf-8 up æ 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg --encoding latin1 out -q ../branch#. 2:df5a44224d4e 3:4f4a5125ca10 $ hg --encoding latin1 out -q -b . 2:df5a44224d4e 3:4f4a5125ca10 clone branch b $ cd .. $ hg clone branch2#b branch3 adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files (+1 heads) updating to branch b 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg -q -R branch3 heads b 2:65511d0e2b55 1:b84708d77ab7 $ hg -q -R branch3 parents 2:65511d0e2b55 $ rm -rf branch3 clone rev a branch b $ hg clone -r a branch2#b branch3 adding changesets adding manifests adding file changes added 3 changesets with 3 changes to 1 files (+1 heads) updating to branch a 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg -q -R branch3 heads b 2:65511d0e2b55 1:b84708d77ab7 $ hg -q -R branch3 parents 0:5b65ba7c951d $ rm -rf branch3