mirror of
https://github.com/facebook/sapling.git
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a1cda97877
Summary: Upstream change the rebase signature, so let's change our wrapper. Test Plan: Ran the tests Reviewers: #fbhgext, quark Reviewed By: #fbhgext, quark Differential Revision: https://phab.mercurial-scm.org/D585
309 lines
11 KiB
Python
309 lines
11 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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::
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[perftweaks]
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# Whether to use faster hidden cache. It has faster cache hash calculation
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# which only check stat of a few files inside store/ directory.
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fasthiddencache = False
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"""
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from mercurial import (
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branchmap,
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dispatch,
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extensions,
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merge,
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phases,
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revlog,
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scmutil,
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tags,
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util,
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)
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from mercurial.extensions import wrapfunction
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from mercurial.node import bin, nullid, nullrev
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import errno
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import os
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testedwith = 'ships-with-fb-hgext'
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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(dispatch, 'runcommand', _trackdirstatesizes)
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wrapfunction(dispatch, 'runcommand', _tracksparseprofiles)
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wrapfunction(merge, 'update', _trackupdatesize)
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try:
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rebase = extensions.find('rebase')
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wrapfunction(rebase.rebaseruntime, '_preparenewrebase',
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_trackrebasesize)
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except KeyError:
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pass
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# noderev cache creation
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# The node rev cache is a cache of rev numbers that we are likely to do a
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# node->rev lookup for. Since looking up rev->node is cheaper than
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# node->rev, we use this cache to prefill the changelog radix tree with
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# mappings.
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wrapfunction(branchmap.branchcache, 'write', _branchmapwrite)
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wrapfunction(phases.phasecache, 'advanceboundary', _editphases)
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wrapfunction(phases.phasecache, 'retractboundary', _editphases)
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try:
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remotenames = extensions.find('remotenames')
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wrapfunction(remotenames, 'saveremotenames', _saveremotenames)
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except KeyError:
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pass
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def reposetup(ui, repo):
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if repo.local() is not None:
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_preloadrevs(repo)
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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 _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 _saveremotenames(orig, repo, remotepath, branches=None, bookmarks=None):
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result = orig(repo, remotepath, branches=branches, bookmarks=bookmarks)
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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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if bookmarks:
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for b, n in bookmarks.iteritems():
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n = bin(n)
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# remotenames can pass bookmarks that don't exist in the
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# changelog yet. It filters them internally, but we need to as
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# well.
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if n in nodemap:
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revs.add(nodemap[n])
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if branches:
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for branch, nodes in branches.iteritems():
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for n in nodes:
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if n in nodemap:
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revs.add(nodemap[n])
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name = 'remotenames-%s' % remotepath
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_savepreloadrevs(repo, name, revs)
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return result
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def _editphases(orig, self, repo, tr, *args):
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result = orig(self, repo, tr, *args)
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def _write(fp):
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revs = set()
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nodemap = repo.changelog.nodemap
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for phase, roots in enumerate(self.phaseroots):
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for n in roots:
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if n in nodemap:
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revs.add(nodemap[n])
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_savepreloadrevs(repo, 'phaseroots', revs)
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# We don't actually use the transaction file generator. It's just a hook so
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# we can write out at the same time as phases.
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if tr:
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tr.addfilegenerator('noderev-phaseroot', ('phaseroots-fake',), _write)
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else:
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# fp is not used anyway
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_write(fp=None)
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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 '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.cachevfs(filename))
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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.cachevfs.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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def _trackdirstatesizes(runcommand, lui, repo, *args):
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res = runcommand(lui, repo, *args)
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if repo is not None and repo.local():
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dirstate = repo.dirstate
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# if the _map attribute is missing on the map, the dirstate was not
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# loaded. If present, it *could* be a sqldirstate map.
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if '_map' in vars(dirstate):
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map_ = dirstate._map
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# check for a sqldirstate, only load length if cache was activated
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sqldirstate = util.safehasattr(map_, '_lookupcache')
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logsize = map_._lookupcache is not None if sqldirstate else True
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if logsize:
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lui.log('dirstate_size', '', dirstate_size=len(dirstate._map))
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return res
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def _tracksparseprofiles(runcommand, lui, repo, *args):
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res = runcommand(lui, repo, *args)
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if repo is not None and repo.local():
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if util.safehasattr(repo, 'getactiveprofiles'):
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profiles = repo.getactiveprofiles()
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lui.log('sparse_profiles', '',
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active_profiles=','.join(sorted(profiles)))
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return res
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def _trackupdatesize(orig, repo, node, branchmerge, *args, **kwargs):
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if not branchmerge:
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distance = len(repo.revs('(%s %% .) + (. %% %s)', node, node))
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repo.ui.log('update_size', '', update_distance=distance)
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stats = orig(repo, node, branchmerge, *args, **kwargs)
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repo.ui.log('update_size', '', update_filecount=sum(stats))
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return stats
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def _trackrebasesize(orig, self, destmap):
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result = orig(self, destmap)
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if not destmap:
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return result
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# The code assumes the rebase source is roughly a linear stack within a
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# single feature branch, and there is only one destination. If that is not
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# the case, the distance might be not accurate.
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repo = self.repo
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destrev = max(destmap.values())
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rebaseset = destmap.keys()
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commitcount = len(rebaseset)
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distance = len(repo.revs('(%ld %% %d) + (%d %% %ld)',
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rebaseset, destrev, destrev, rebaseset))
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# 'distance' includes the commits being rebased, so subtract them to get the
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# actual distance being traveled. Even though we log update_distance above,
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# a rebase may run multiple updates, so that value might be not be accurate.
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repo.ui.log('rebase_size', '', rebase_commitcount=commitcount,
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rebase_distance=distance - commitcount)
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return result
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