Mercurial > hg
annotate tests/test-issue2137.t @ 30706:2e4862646f02
repair: speed up stripping of many roots
repair.strip() expects a set of root revisions to strip. It then
builds the full set of descedants by walking the descandants of
each. It is rare that more than a few roots get passed in, but if that
happens, it will wastefully walk the changelog for each root. So let's
just walk it once.
I noticed this because the narrowhg extension was passing not only
roots, but all the commits to strip. When there were tens of thousands
of commits to strip, this resulted in quadratic behavior with that
extension.
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 04 Jan 2017 10:07:12 -0800 |
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1 https://bz.mercurial-scm.org/2137 |
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2 |
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3 Setup: |
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4 |
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5 create a little extension that has 3 side-effects: |
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6 1) ensure changelog data is not inlined |
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7 2) make revlog to use lazyparser |
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8 3) test that repo.lookup() works |
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9 1 and 2 are preconditions for the bug; 3 is the bug. |
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10 |
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11 $ cat > commitwrapper.py <<EOF |
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12 > from mercurial import extensions, node, revlog |
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13 > |
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14 > def reposetup(ui, repo): |
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15 > class wraprepo(repo.__class__): |
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16 > def commit(self, *args, **kwargs): |
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17 > result = super(wraprepo, self).commit(*args, **kwargs) |
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18 > tip1 = node.short(repo.changelog.tip()) |
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19 > tip2 = node.short(repo.lookup(tip1)) |
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20 > assert tip1 == tip2 |
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21 > ui.write('new tip: %s\n' % tip1) |
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22 > return result |
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23 > repo.__class__ = wraprepo |
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24 > |
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25 > def extsetup(ui): |
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26 > revlog._maxinline = 8 # split out 00changelog.d early |
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27 > revlog._prereadsize = 8 # use revlog.lazyparser |
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28 > EOF |
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29 |
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30 $ cat >> $HGRCPATH <<EOF |
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31 > [extensions] |
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32 > commitwrapper = `pwd`/commitwrapper.py |
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33 > EOF |
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34 |
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35 $ hg init repo1 |
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36 $ cd repo1 |
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37 $ echo a > a |
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38 $ hg commit -A -m'add a with a long commit message to make the changelog a bit bigger' |
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39 adding a |
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40 new tip: 553596fad57b |
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41 |
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42 Test that new changesets are visible to repo.lookup(): |
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43 |
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44 $ echo a >> a |
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45 $ hg commit -m'one more commit to demonstrate the bug' |
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46 new tip: 799ae3599e0e |
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47 |
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48 $ hg tip |
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49 changeset: 1:799ae3599e0e |
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50 tag: tip |
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51 user: test |
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52 date: Thu Jan 01 00:00:00 1970 +0000 |
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53 summary: one more commit to demonstrate the bug |
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54 |
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55 |
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56 $ cd .. |