This is an archive of the discontinued Mercurial Phabricator instance.

contrib/perf.py
2324	As I was recently reminded by Yuya, the perf commands are supposed to be compatible with older versions of hg too, and this doesn't seem to be compatible with the `branchmap.read()` version.

mjpieters added a subscriber: yuja.Jan 26 2019, 8:17 AM

mjpieters added inline comments.

contrib/perf.py
2324	Why is that? @yuja, can you elaborate? This is version-controlled code that changes in lock-step with the branchmap module, adding backwards compatibility tests here would add a costly maintenance burden. If you have an older revision of the branchmap module, you also have an older revision of the perf code.

mjpieters updated this revision to Diff 13501.Jan 26 2019, 8:45 AM

martinvonz added inline comments.Jan 26 2019, 9:42 AM

contrib/perf.py
2324	I'm pretty sure the idea is that you should be able to enable the latest perf extension and run different versions of hg (perhaps versions that you had already built) against it to compare performance.

Why is that? @yuja, can you elaborate?
This is version-controlled code that changes in lock-step with the branchmap module, adding backwards compatibility tests here would add a costly maintenance burden. If you have an older revision of the branchmap module, you also have an older revision of the perf code.

I'm pretty sure the idea is that you should be able to enable the latest perf extension and run different versions of hg (perhaps versions that you had already built) against it to compare performance.

Something like that IIRC. A perf function itself can be improved in a way
that the resulting number isn't comparable with the one of older perf codes.

It's documented in the header. 4533f5b47949

mjpieters updated this revision to Diff 13542.Jan 28 2019, 12:47 PM

mjpieters marked an inline comment as done.Jan 28 2019, 12:48 PM

pulkit accepted this revision.Feb 5 2019, 11:28 AM

Closed by commit rHGbf7fb97aecf1: branchmap: make branchcache responsible for reading (authored by mjpieters). · Explain WhyFeb 5 2019, 11:45 AM

This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

			Path	Packages
M			contrib/perf.py (10 lines)
M			mercurial/branchmap.py (119 lines)

Diff	ID	Description	Created	Lint	Unit
Base		Base
Diff 1	13330		Jan 21 2019, 1:08 PM	★	★
Diff 2	13501		Jan 26 2019, 8:45 AM	★	★
Diff 3	13542		Jan 28 2019, 12:47 PM	★	★
Diff 4	13806	rHGbf7fb97aecf189c74eb3d1eaeddc2a7872b855cd	Jan 21 2019, 11:04 AM	★	★

Commit	Parents	Author	Summary	Date
		Martijn Pieters		Jan 21 2019, 11:04 AM

Status	Author	Revision
Closed	mjpieters	D5638 branchmap: encapsulate cache updating in the map itself
Closed	mjpieters	D5637 branchmap: add some clarifications and clean up flow
Closed	mjpieters	D5636 branchmap: updating triggers a write
Closed	mjpieters	D5635 branchmap: make branchcache responsible for reading
Abandoned	mjpieters	D5292 branchmap: make it easier for extensions not to break branchcache
Closed	mjpieters	D5290 branchmap: rename partial -> bcache

Diff 13501

contrib/perf.py

	# warm the cache			# warm the cache
	if not full:			if not full:
	for name in allfilters:			for name in allfilters:
	repo.filtered(name).branchmap()			repo.filtered(name).branchmap()
	if not filternames or b'unfiltered' in filternames:			if not filternames or b'unfiltered' in filternames:
	# add unfiltered			# add unfiltered
	allfilters.append(None)			allfilters.append(None)

	branchcacheread = safeattrsetter(branchmap, b'read')			branchcacheread = safeattrsetter(branchmap.branchcache, b'fromfile')
				martinvonzUnsubmitted Not Done As I was recently reminded by Yuya, the perf commands are supposed to be compatible with older versions of hg too, and this doesn't seem to be compatible with the `branchmap.read()` version. martinvonz: As I was recently reminded by Yuya, the perf commands are supposed to be compatible with older…
				mjpietersAuthorUnsubmitted Not Done Why is that? @yuja, can you elaborate? This is version-controlled code that changes in lock-step with the branchmap module, adding backwards compatibility tests here would add a costly maintenance burden. If you have an older revision of the branchmap module, you also have an older revision of the perf code. mjpieters: Why is that? @yuja, can you elaborate? This is version-controlled code that changes in lock…
				martinvonzUnsubmitted Done I'm pretty sure the idea is that you should be able to enable the latest perf extension and run different versions of hg (perhaps versions that you had already built) against it to compare performance. martinvonz: I'm pretty sure the idea is that you should be able to enable the latest perf extension and run…
	branchcachewrite = safeattrsetter(branchmap.branchcache, b'write')			branchcachewrite = safeattrsetter(branchmap.branchcache, b'write')
	branchcacheread.set(lambda repo: None)			branchcacheread.set(classmethod(lambda *args: None))
	branchcachewrite.set(lambda bc, repo: None)			branchcachewrite.set(lambda *args: None)
	try:			try:
	for name in allfilters:			for name in allfilters:
	printname = name			printname = name
	if name is None:			if name is None:
	printname = b'unfiltered'			printname = b'unfiltered'
	timer(getbranchmap(name), title=str(printname))			timer(getbranchmap(name), title=str(printname))
	finally:			finally:
	branchcacheread.restore()			branchcacheread.restore()
	repo = repo.unfiltered()			repo = repo.unfiltered()
	else:			else:
	repo = repoview.repoview(repo, filter)			repo = repoview.repoview(repo, filter)

	repo.branchmap() # make sure we have a relevant, up to date branchmap			repo.branchmap() # make sure we have a relevant, up to date branchmap

	currentfilter = filter			currentfilter = filter
	# try once without timer, the filter may not be cached			# try once without timer, the filter may not be cached
	while branchmap.read(repo) is None:			while branchmap.branchcache.fromfile(repo) is None:
	currentfilter = subsettable.get(currentfilter)			currentfilter = subsettable.get(currentfilter)
	if currentfilter is None:			if currentfilter is None:
	raise error.Abort(b'No branchmap cached for %s repo'			raise error.Abort(b'No branchmap cached for %s repo'
	% (filter or b'unfiltered'))			% (filter or b'unfiltered'))
	repo = repo.filtered(currentfilter)			repo = repo.filtered(currentfilter)
	timer, fm = gettimer(ui, opts)			timer, fm = gettimer(ui, opts)
	def setup():			def setup():
	if clearrevlogs:			if clearrevlogs:
	clearchangelog(repo)			clearchangelog(repo)
	def bench():			def bench():
	branchmap.read(repo)			branchmap.branchcache.fromfile(repo)
	timer(bench, setup=setup)			timer(bench, setup=setup)
	fm.end()			fm.end()

	@command(b'perfloadmarkers')			@command(b'perfloadmarkers')
	def perfloadmarkers(ui, repo):			def perfloadmarkers(ui, repo):
	"""benchmark the time to parse the on-disk markers for a repo			"""benchmark the time to parse the on-disk markers for a repo

	Result is the number of markers in the repo."""			Result is the number of markers in the repo."""

mercurial/branchmap.py

	from .utils import (			from .utils import (
	stringutil,			stringutil,
	)			)

	calcsize = struct.calcsize			calcsize = struct.calcsize
	pack_into = struct.pack_into			pack_into = struct.pack_into
	unpack_from = struct.unpack_from			unpack_from = struct.unpack_from

	def _filename(repo):
	"""name of a branchcache file for a given repo or repoview"""
	filename = "branch2"
	if repo.filtername:
	filename = '%s-%s' % (filename, repo.filtername)
	return filename

	def read(repo):
	f = None
	try:
	f = repo.cachevfs(_filename(repo))
	lineiter = iter(f)
	cachekey = next(lineiter).rstrip('\n').split(" ", 2)
	last, lrev = cachekey[:2]
	last, lrev = bin(last), int(lrev)
	filteredhash = None
	if len(cachekey) > 2:
	filteredhash = bin(cachekey[2])
	bcache = branchcache(tipnode=last, tiprev=lrev,
	filteredhash=filteredhash)
	if not bcache.validfor(repo):
	# invalidate the cache
	raise ValueError(r'tip differs')
	cl = repo.changelog
	for l in lineiter:
	l = l.rstrip('\n')
	if not l:
	continue
	node, state, label = l.split(" ", 2)
	if state not in 'oc':
	raise ValueError(r'invalid branch state')
	label = encoding.tolocal(label.strip())
	node = bin(node)
	if not cl.hasnode(node):
	raise ValueError(
	r'node %s does not exist' % pycompat.sysstr(hex(node)))
	bcache.setdefault(label, []).append(node)
	if state == 'c':
	bcache._closednodes.add(node)

	except (IOError, OSError):
	return None

	except Exception as inst:
	if repo.ui.debugflag:
	msg = 'invalid branchheads cache'
	if repo.filtername is not None:
	msg += ' (%s)' % repo.filtername
	msg += ': %s\n'
	repo.ui.debug(msg % pycompat.bytestr(inst))
	bcache = None

	finally:
	if f:
	f.close()

	return bcache

	### Nearest subset relation			### Nearest subset relation
	# Nearest subset of filter X is a filter Y so that:			# Nearest subset of filter X is a filter Y so that:
	# * Y is included in X,			# * Y is included in X,
	# * X - Y is as small as possible.			# * X - Y is as small as possible.
	# This create and ordering used for branchmap purpose.			# This create and ordering used for branchmap purpose.
	# the ordering may be partial			# the ordering may be partial
	subsettable = {None: 'visible',			subsettable = {None: 'visible',
	'visible-hidden': 'visible',			'visible-hidden': 'visible',
	'visible': 'served',			'visible': 'served',
	'served': 'immutable',			'served': 'immutable',
	'immutable': 'base'}			'immutable': 'base'}

	def updatecache(repo):			def updatecache(repo):
	cl = repo.changelog			cl = repo.changelog
	filtername = repo.filtername			filtername = repo.filtername
	bcache = repo._branchcaches.get(filtername)			bcache = repo._branchcaches.get(filtername)

	revs = []			revs = []
	if bcache is None or not bcache.validfor(repo):			if bcache is None or not bcache.validfor(repo):
	bcache = read(repo)			bcache = branchcache.fromfile(repo)
	if bcache is None:			if bcache is None:
	subsetname = subsettable.get(filtername)			subsetname = subsettable.get(filtername)
	if subsetname is None:			if subsetname is None:
	bcache = branchcache()			bcache = branchcache()
	else:			else:
	subset = repo.filtered(subsetname)			subset = repo.filtered(subsetname)
	bcache = subset.branchmap().copy()			bcache = subset.branchmap().copy()
	extrarevs = subset.changelog.filteredrevs - cl.filteredrevs			extrarevs = subset.changelog.filteredrevs - cl.filteredrevs
	The first line is used to check if the cache is still valid. If the			The first line is used to check if the cache is still valid. If the
	branch cache is for a filtered repo view, an optional third hash is			branch cache is for a filtered repo view, an optional third hash is
	included that hashes the hashes of all filtered revisions.			included that hashes the hashes of all filtered revisions.

	The open/closed state is represented by a single letter 'o' or 'c'.			The open/closed state is represented by a single letter 'o' or 'c'.
	This field can be used to avoid changelog reads when determining if a			This field can be used to avoid changelog reads when determining if a
	branch head closes a branch or not.			branch head closes a branch or not.
	"""			"""
				@classmethod
				def fromfile(cls, repo):
				f = None
				try:
				f = repo.cachevfs(cls._filename(repo))
				lineiter = iter(f)
				cachekey = next(lineiter).rstrip('\n').split(" ", 2)
				last, lrev = cachekey[:2]
				last, lrev = bin(last), int(lrev)
				filteredhash = None
				if len(cachekey) > 2:
				filteredhash = bin(cachekey[2])
				bcache = cls(tipnode=last, tiprev=lrev, filteredhash=filteredhash)
				if not bcache.validfor(repo):
				# invalidate the cache
				raise ValueError(r'tip differs')
				cl = repo.changelog
				for line in lineiter:
				line = line.rstrip('\n')
				if not line:
				continue
				node, state, label = line.split(" ", 2)
				if state not in 'oc':
				raise ValueError(r'invalid branch state')
				label = encoding.tolocal(label.strip())
				node = bin(node)
				if not cl.hasnode(node):
				raise ValueError(
				r'node %s does not exist' % pycompat.sysstr(hex(node)))
				bcache.setdefault(label, []).append(node)
				if state == 'c':
				bcache._closednodes.add(node)

				except (IOError, OSError):
				return None

				except Exception as inst:
				if repo.ui.debugflag:
				msg = 'invalid branchheads cache'
				if repo.filtername is not None:
				msg += ' (%s)' % repo.filtername
				msg += ': %s\n'
				repo.ui.debug(msg % pycompat.bytestr(inst))
				bcache = None

				finally:
				if f:
				f.close()

				return bcache

				@staticmethod
				def _filename(repo):
				"""name of a branchcache file for a given repo or repoview"""
				filename = "branch2"
				if repo.filtername:
				filename = '%s-%s' % (filename, repo.filtername)
				return filename

	def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,			def __init__(self, entries=(), tipnode=nullid, tiprev=nullrev,
	filteredhash=None, closednodes=None):			filteredhash=None, closednodes=None):
	super(branchcache, self).__init__(entries)			super(branchcache, self).__init__(entries)
	self.tipnode = tipnode			self.tipnode = tipnode
	self.tiprev = tiprev			self.tiprev = tiprev
	self.filteredhash = filteredhash			self.filteredhash = filteredhash
	# closednodes is a set of nodes that close their branch. If the branch			# closednodes is a set of nodes that close their branch. If the branch

	def copy(self):			def copy(self):
	"""return an deep copy of the branchcache object"""			"""return an deep copy of the branchcache object"""
	return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,			return branchcache(self, self.tipnode, self.tiprev, self.filteredhash,
	self._closednodes)			self._closednodes)

	def write(self, repo):			def write(self, repo):
	try:			try:
	f = repo.cachevfs(_filename(repo), "w", atomictemp=True)			f = repo.cachevfs(self._filename(repo), "w", atomictemp=True)
	cachekey = [hex(self.tipnode), '%d' % self.tiprev]			cachekey = [hex(self.tipnode), '%d' % self.tiprev]
	if self.filteredhash is not None:			if self.filteredhash is not None:
	cachekey.append(hex(self.filteredhash))			cachekey.append(hex(self.filteredhash))
	f.write(" ".join(cachekey) + '\n')			f.write(" ".join(cachekey) + '\n')
	nodecount = 0			nodecount = 0
	for label, nodes in sorted(self.iteritems()):			for label, nodes in sorted(self.iteritems()):
	for node in nodes:			for node in nodes:
	nodecount += 1			nodecount += 1

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Diff 13501

contrib/perf.py

mercurial/branchmap.py

branchmap: make branchcache responsible for reading
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