Mercurial > hg
view tests/test-unrelated-pull.t @ 46254:c4b792fa109e
branchmap: avoid ancestor computations in absence of non-continous branches
The branchhead computation is one of the more heavy operations for
bigger repositories as it has to scan all changesets and potentially
involves the expensive computation of the ancestor sets. Redo the
computation to handle the common cases directly and use tighter
conditions for when the ancestor scan is necessary. Most importantly,
avoid it completely if the non-continous branches are processed in one
update as seen in the initial computation after a clone.
For the Mercurial repository, it gives a small 2-3% performance boost.
For the NetBSD test repository, it cuts the time in half.
Differential Revision: https://phab.mercurial-scm.org/D9631
author | Joerg Sonnenberger <joerg@bec.de> |
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date | Fri, 18 Dec 2020 14:45:28 +0100 |
parents | eb586ed5d8ce |
children |
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$ hg init a $ cd a $ echo 123 > a $ hg add a $ hg commit -m "a" -u a $ cd .. $ hg init b $ cd b $ echo 321 > b $ hg add b $ hg commit -m "b" -u b $ hg pull ../a pulling from ../a searching for changes abort: repository is unrelated [255] $ hg pull -f ../a pulling from ../a searching for changes warning: repository is unrelated requesting all changes adding changesets adding manifests adding file changes added 1 changesets with 1 changes to 1 files (+1 heads) new changesets 9a79c33a9db3 (run 'hg heads' to see heads, 'hg merge' to merge) $ hg heads changeset: 1:9a79c33a9db3 tag: tip parent: -1:000000000000 user: a date: Thu Jan 01 00:00:00 1970 +0000 summary: a changeset: 0:01f8062b2de5 user: b date: Thu Jan 01 00:00:00 1970 +0000 summary: b $ cd ..