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c5e9c5097f
Summary: The branch cache is used to store a cache of each branches heads. If your Mercurial repo doesn't have any branches though, this can be slow. This tweak allows simplifying the branchcache computation to just say every head in the repo belongs to the 'default' branch. This shaves 600ms off of some commit commands. I tested it by running the entire Mercurial test suite with it enabled, and scanning the failures to make sure they were only related to repos that had non-default branches. Test Plan: $ cd ~/hg/tests $ ./run-tests.py -S -j 48 --extra-config-opt=perftweaks.disablebranchcache=True --extra-config-opt=extensions.perftweaks=/data/users/durham/fb-hgext/perftweaks.py Reviewers: #sourcecontrol, rmcelroy Reviewed By: rmcelroy Subscribers: rmcelroy Differential Revision: https://phabricator.fb.com/D2630360 Signature: t1:2630360:1447092762:adab0456ff842cf508b7f46e988ef9d865fa3988
64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
# perftweaks.py
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#
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# Copyright 2015 Facebook, Inc.
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""extension for tweaking Mercurial features to improve performance."""
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from mercurial import branchmap, merge, scmutil, tags
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from mercurial.extensions import wrapcommand, wrapfunction
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from mercurial.i18n import _
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from mercurial.node import nullid, nullrev
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import os
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testedwith = 'internal'
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def extsetup(ui):
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wrapfunction(tags, '_readtagcache', _readtagcache)
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wrapfunction(merge, '_checkcollision', _checkcollision)
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wrapfunction(branchmap.branchcache, 'update', _branchmapupdate)
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def _readtagcache(orig, ui, repo):
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"""Disables reading tags if the repo is known to not contain any."""
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if ui.configbool('perftweaks', 'disabletags'):
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return (None, None, None, {}, False)
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return orig(ui, repo)
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def _checkcollision(orig, repo, wmf, actions):
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"""Disables case collision checking since it is known to be very slow."""
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if repo.ui.configbool('perftweaks', 'disablecasecheck'):
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return
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orig(repo, wmf, actions)
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def _branchmapupdate(orig, self, repo, revgen):
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if not repo.ui.configbool('perftweaks', 'disablebranchcache'):
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return orig(self, repo, revgen)
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cl = repo.changelog
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# Since we have no branches, the default branch heads are equal to
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# cl.headrevs().
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branchheads = sorted(cl.headrevs())
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self['default'] = [cl.node(rev) for rev in branchheads]
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tiprev = branchheads[-1]
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if tiprev > self.tiprev:
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self.tipnode = cl.node(tiprev)
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self.tiprev = tiprev
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# Copy and paste from branchmap.branchcache.update()
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if not self.validfor(repo):
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# cache key are not valid anymore
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self.tipnode = nullid
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self.tiprev = nullrev
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for heads in self.values():
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tiprev = max(cl.rev(node) for node in heads)
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if tiprev > self.tiprev:
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self.tipnode = cl.node(tiprev)
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self.tiprev = tiprev
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self.filteredhash = scmutil.filteredhash(repo, self.tiprev)
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repo.ui.log('branchcache', 'perftweaks updated %s branch cache\n',
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repo.filtername)
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