mirror of
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8a3a99ba21
Summary: Be a better citizen under system python path. Fix all tests issues and change setup.py to use glob pattern to include all extensions. Test Plan: Run tests and `make local`. Also build and install the package and run `hg sl` in major repos. Reviewers: #mercurial, ttung, rmcelroy Reviewed By: rmcelroy Subscribers: rmcelroy, durham, mjpieters Differential Revision: https://phabricator.intern.facebook.com/D3534311 Signature: t1:3534311:1468275426:fe122646c8bd6c541e1889e73e9df28f86747ff2
171 lines
6.4 KiB
Python
171 lines
6.4 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, revlog, scmutil, tags, util
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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 errno
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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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if ui.configbool('perftweaks', 'preferdeltas'):
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wrapfunction(revlog.revlog, '_isgooddelta', _isgooddelta)
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wrapfunction(branchmap.branchcache, 'write', _branchmapwrite)
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wrapfunction(branchmap, 'read', _branchmapread)
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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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def _branchmapread(orig, repo):
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_preloadrevs(repo)
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return orig(repo)
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def _branchmapwrite(orig, self, repo):
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result = orig(self, repo)
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if repo.ui.configbool('perftweaks', 'cachenoderevs', True):
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revs = set()
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nodemap = repo.changelog.nodemap
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for branch, heads in self.iteritems():
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revs.update(nodemap[n] for n in heads)
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name = 'branchheads-%s' % repo.filtername
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_savepreloadrevs(repo, name, revs)
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return result
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def _isgooddelta(orig, self, d, textlen):
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"""Returns True if the given delta is good. Good means that it is within
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the disk span, disk size, and chain length bounds that we know to be
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performant."""
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if d is None:
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return False
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# - 'dist' is the distance from the base revision -- bounding it limits
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# the amount of I/O we need to do.
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# - 'compresseddeltalen' is the sum of the total size of deltas we need
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# to apply -- bounding it limits the amount of CPU we consume.
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dist, l, data, base, chainbase, chainlen, compresseddeltalen = d
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# Our criteria:
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# 1. the delta is not larger than the full text
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# 2. the delta chain cumulative size is not greater than twice the fulltext
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# 3. The chain length is less than the maximum
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#
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# This differs from upstream Mercurial's criteria. They prevent the total
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# ondisk span from chain base to rev from being greater than 4x the full
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# text len. This isn't good enough in our world since if we have 10+
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# branches going on at once, we can easily exceed the 4x limit and cause
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# full texts to be written over and over again.
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if (l > textlen or compresseddeltalen > textlen * 2 or
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(self._maxchainlen and chainlen > self._maxchainlen)):
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return False
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return True
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def _cachefilename(name):
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return 'cache/noderevs/%s' % name
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def _preloadrevs(repo):
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# Preloading the node-rev map for likely to be used revs saves 100ms on
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# every command. This is because normally to look up a node, hg has to scan
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# the changelog.i file backwards, potentially reading through hundreds of
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# thousands of entries and building a cache of them. Looking up a rev
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# however is fast, because we know exactly what offset in the file to read.
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# Reading old commits is common, since the branchmap needs to to convert old
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# branch heads from node to rev.
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if repo.ui.configbool('perftweaks', 'cachenoderevs', True):
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repo = repo.unfiltered()
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revs = set()
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cachedir = repo.vfs.join('cache', 'noderevs')
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try:
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for cachefile in os.listdir(cachedir):
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filename = _cachefilename(cachefile)
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revs.update(int(r) for r in repo.vfs.open(filename).readlines())
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getnode = repo.changelog.node
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nodemap = repo.changelog.nodemap
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for r in revs:
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try:
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node = getnode(r)
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nodemap[node] = r
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except (IndexError, ValueError):
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# Rev no longer exists or rev is out of range
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pass
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except EnvironmentError:
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# No permission to read? No big deal
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pass
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def _savepreloadrevs(repo, name, revs):
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if repo.ui.configbool('perftweaks', 'cachenoderevs', True):
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cachedir = repo.vfs.join('cache', 'noderevs')
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try:
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repo.vfs.mkdir(cachedir)
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except OSError as ex:
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# If we failed because the directory already exists,
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# continue. In all other cases (e.g., no permission to create the
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# directory), just silently return without doing anything.
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if ex.errno != errno.EEXIST:
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return
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try:
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filename = _cachefilename(name)
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f = repo.vfs.open(filename, mode='w+', atomictemp=True)
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f.write('\n'.join(str(r) for r in revs))
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f.close()
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except EnvironmentError:
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# No permission to write? No big deal
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pass
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