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indygreg
durin42
quark

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rHG3c9691728237: revlog: add option to mmap revlog index

Summary

Following on from Jun Wu's patch last October[1], we have found that using mmap
for the revlog index in repos with large revlogs gives a noticable performance
improvment (~110ms on each hg invocation), particularly for commands that don't
touch the index very much.

This changeset adds this as an option, activated by a new experimental config
option so that it can be enabled on a per-repo basis. The configuration option
specifies an index size threshold at which Mercurial will switch to using mmap
to access the index.

If the configuration option is not specified, the default remains to load the
full file, which seems to be the best option for smaller repos.

Some initial performance numbers for average of 5 invocations of hg log -l 5
for different cache states:

Repo:	HG	FB
Index size:	2.3MB	much bigger
read (warm):	237ms	432ms
mmap (warm):	227ms	321ms
	(-3%)	(-26%)
read (cold):	397ms	696ms
mmap (cold):	410ms	888ms
	(+3%)	(+28%)

[1] https://www.mercurial-scm.org/pipermail/mercurial-devel/2016-October/088737.html

Test Plan

hg log --config experimental.mmapindex=true

Diff Detail

Repository

rHG Mercurial

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Automatic diff as part of commit; lint not applicable.

Unit

Automatic diff as part of commit; unit tests not applicable.

Event Timeline

mbthomas created this revision.Aug 22 2017, 10:37 AM

Herald added a reviewer: indygreg. · View Herald TranscriptAug 22 2017, 10:37 AM

Herald added a reviewer: hg-reviewers. · View Herald Transcript

Herald added a subscriber: mercurial-devel. · View Herald Transcript

mbthomas added a parent revision: D476: util: add an mmapread method.Aug 22 2017, 10:37 AM

simonfar added a subscriber: simonfar.Aug 23 2017, 9:05 AM

simonfar added inline comments.

mercurial/revlog.py
347	Is there any reason for `mmapread` to not immediately wrap the data in a `util.buffer` for you?

simonfar mentioned this in D476: util: add an mmapread method.Aug 23 2017, 9:06 AM

This seems reasonable as an experimental feature.

I worry about memory mapping all files without regards to size. That seems unnecessary.

Do you know what happens with the underlying file descriptor when it is memory mapped? If an fd stays open, that could lead to fd exhaustion. This can be mitigated by only using mmap for certain files (minimize size, changelog, etc). It's something I'd like an answer to before this is queued.

mercurial/localrepo.py
607–608	As you wrote in the commit message, the benefits of memory mapping likely kick in at some threshold and we'll want to make this behavior conditional on index size. It is tempting to implement that today to facilitate experimentation. If you can do that without introducing extra system calls for the default file open case, do it.
mercurial/revlog.py
332	We only support 2.7 now. So this version sniffing can be removed.

This revision now requires changes to proceed.Aug 23 2017, 11:31 AM

Also, please include at least one log invocation or similar in a test with the config knob set? And maybe some rough benchmark results in the commit message to justify the feature. :)

I think it might make sense to only apply it to manifest and changelog. Filelogs are usually short and probably do not need it.

In D477#7739, @indygreg wrote:

Do you know what happens with the underlying file descriptor when it is memory mapped? If an fd stays open, that could lead to fd exhaustion. This can be mitigated by only using mmap for certain files (minimize size, changelog, etc). It's something I'd like an answer to before this is queued.

The fd remains open. (Actually, the fd is dup'd and the original one is closed. The dup remains open.) For this reason I'm going to restrict it to changelog and manifest indexes only, as those are the ones that are known to grow big.

mercurial/revlog.py
347	I took it from Jun's original patch, but I think it's simply separation of responsibilities. `util.mmapread`'s purpose is to wrap `mmap(... ACCESS_READ)` and handle the case where the file is empty, which normally fails.

Switch to index size threshold for mmap, and only do it for changelog and manifest.
Rebase and add test.

I've switched to a configurable threshold for mmap as suggested. This does require an extra stat call for the changelog and manifest indexes, however python already calls stat each time you open a file, so we should just hit the filesystem cache.

simonfar added inline comments.Aug 24 2017, 10:26 AM

tests/test-revlog-mmapindex.t
13–14	Two things: Can you add a `ui.debug()` or similar so that you can show that `mmap()` is in use here? Can you repeat the test without `mmap()` to show that `mmap()` and not-`mmap()` both still work?

mbthomas added inline comments.Aug 24 2017, 10:35 AM

tests/test-revlog-mmapindex.t
13–14	For (1) There's no `ui` object available in the `revlog.revlog` constructor. Is there a way to get one? For (2), the rest of the test suite will be loading the revlog without mmap, so I didn't think it necessary to test it again here.

indygreg added inline comments.Aug 24 2017, 10:18 PM

tests/test-revlog-mmapindex.t
13–14	I'd do it with inline Python. Something like: from mercurial import hg, ui as uimod myui = uimod.ui.load() repo = hg.repository(myui, path='.') Test repo.changelog here. Also, excessive `hg` commands makes tests slow. Unfortunately, doing this in Python is probably a bit of work :/

I think revlog is decoupled from ui intentionally. I would avoid using ui.debug to test it, but just have a extension in .t that wraps the mmap method and print something to indicate mmap is being used.

Make mmap test check for mmapping by making util.mmapread verbose

quark added inline comments.Aug 25 2017, 12:03 PM

tests/test-revlog-mmapindex.t
16	In this case `verbosemmap.py` is not very useful in other tests. The common pattern is to make it inside the `.t` file: $ cat > verbosemmap.py <<EOF > ... > EOF $ cat >> $HGRCPATH.py << EOF > ... > verbosemmap.py=$TESTTMP/verbosemmap.py > EOF

Move verbosemmap.py into the test

Generally look good to me.

mercurial/revlog.py
308	This variable is only used in `__init__` so it is unnecessary to attach it to revlog object. In theory it could make a little difference if there are many revlog objects being created.
1564	I have checked this `checkinlinesize` code path and believe this patch isn't making things worse. That said, I feel `checkinlinesize` could be troublesome in some cases. And maybe it's safer to move it to a post-close transaction hook.

Rebase and remove mmapindexthreshold from revlog object

Please include benchmark numbers in your commit message.

This revision now requires changes to proceed.Sep 15 2017, 11:25 AM

I had put the numbers in the commit message, but that doesn't update the Phabricator summary, so I've done that manually.

It should be clear from the numbers that the improvement only really surfaces when the filesystem cache is warm, and there is a penalty for using this option when the filesystem cache is cold. Since the cache should be warm more often than not, the expectation is an overall improvement.

mbthomas requested review of this revision.Sep 15 2017, 12:28 PM

Also, the improvements should become more pronounced if we fix some algorithms (like phases) that access really old commits.

In D477#12028, @mbthomas wrote:

I had put the numbers in the commit message, but that doesn't update the Phabricator summary, so I've done that manually.

I think you were using arc and can use hg phabsend to get the commit message updated. See https://www.mercurial-scm.org/wiki/Phabricator for instructions.

durham edited the summary of this revision. (Show Details)Sep 15 2017, 7:52 PM

237ms for HG seems there is something wrong.

durin42 requested changes to this revision.Sep 20 2017, 12:03 PM

durin42 added inline comments.

mercurial/revlog.py
348	This makes me very uncomfortable, because util.mmapread() returns the empty string if it doesn't like the file descriptor. I'd be less worried if util.mmapread() crashed, or if this was more cautious about the mmapread failing for some reason.

This revision now requires changes to proceed.Sep 20 2017, 12:03 PM

I'm landing this, but we should plan to figure out the right tradeoff values and get it on by default or discard the extra complexity at some point. That doesn't have to be before 4.4, but it'd be nice to have that sorted out by 4.5.

Closed by commit rHG3c9691728237: revlog: add option to mmap revlog index (authored by mbthomas). · Explain WhySep 21 2017, 2:05 PM

This revision was automatically updated to reflect the committed changes.

Diff	ID	Description	Created	Lint	Unit
Base		Base
Diff 1	1158		Aug 22 2017, 10:37 AM	★	★
Diff 2	1245	Switch to index size threshold for mmap, and only do it for changelog and…	Aug 24 2017, 10:00 AM	★	★
Diff 3	1294	Make mmap test check for mmapping by making util.mmapread verbose	Aug 25 2017, 11:58 AM	★	★
Diff 4	1297	Move verbosemmap.py into the test	Aug 25 2017, 2:46 PM	★	★
Diff 5	1786	Rebase and remove mmapindexthreshold from revlog object	Sep 13 2017, 1:27 PM	★	★
Diff 6	1969	rHG3c96917282376912851e24cd1cf79c93427640f2	Sep 13 2017, 1:26 PM	★	★

	Status	Author	Revision
	Closed	mbthomas	D477 revlog: add option to mmap revlog index
	Closed	mbthomas	D476 util: add an mmapread method

Diff 1969

mercurial/changelog.py

	"""			"""
	if trypending and opener.exists('00changelog.i.a'):			if trypending and opener.exists('00changelog.i.a'):
	indexfile = '00changelog.i.a'			indexfile = '00changelog.i.a'
	else:			else:
	indexfile = '00changelog.i'			indexfile = '00changelog.i'

	datafile = '00changelog.d'			datafile = '00changelog.d'
	revlog.revlog.__init__(self, opener, indexfile, datafile=datafile,			revlog.revlog.__init__(self, opener, indexfile, datafile=datafile,
	checkambig=True)			checkambig=True, mmaplargeindex=True)

	if self._initempty:			if self._initempty:
	# changelogs don't benefit from generaldelta			# changelogs don't benefit from generaldelta
	self.version &= ~revlog.FLAG_GENERALDELTA			self.version &= ~revlog.FLAG_GENERALDELTA
	self._generaldelta = False			self._generaldelta = False

	# Delta chains for changelogs tend to be very small because entries			# Delta chains for changelogs tend to be very small because entries
	# tend to be small and don't delta well with each. So disable delta			# tend to be small and don't delta well with each. So disable delta

mercurial/localrepo.py

	# experimental config: format.aggressivemergedeltas			# experimental config: format.aggressivemergedeltas
	aggressivemergedeltas = self.ui.configbool('format',			aggressivemergedeltas = self.ui.configbool('format',
	'aggressivemergedeltas')			'aggressivemergedeltas')
	self.svfs.options['aggressivemergedeltas'] = aggressivemergedeltas			self.svfs.options['aggressivemergedeltas'] = aggressivemergedeltas
	self.svfs.options['lazydeltabase'] = not scmutil.gddeltaconfig(self.ui)			self.svfs.options['lazydeltabase'] = not scmutil.gddeltaconfig(self.ui)
	chainspan = self.ui.configbytes('experimental', 'maxdeltachainspan', -1)			chainspan = self.ui.configbytes('experimental', 'maxdeltachainspan', -1)
	if 0 <= chainspan:			if 0 <= chainspan:
	self.svfs.options['maxdeltachainspan'] = chainspan			self.svfs.options['maxdeltachainspan'] = chainspan
				mmapindexthreshold = self.ui.configbytes('experimental',
				'mmapindexthreshold', None)
				indygregUnsubmitted Not Done As you wrote in the commit message, the benefits of memory mapping likely kick in at some threshold and we'll want to make this behavior conditional on index size. It is tempting to implement that today to facilitate experimentation. If you can do that without introducing extra system calls for the default file open case, do it. indygreg: As you wrote in the commit message, the benefits of memory mapping likely kick in at some…
				if mmapindexthreshold is not None:
				self.svfs.options['mmapindexthreshold'] = mmapindexthreshold

	for r in self.requirements:			for r in self.requirements:
	if r.startswith('exp-compression-'):			if r.startswith('exp-compression-'):
	self.svfs.options['compengine'] = r[len('exp-compression-'):]			self.svfs.options['compengine'] = r[len('exp-compression-'):]

	# TODO move "revlogv2" to openerreqs once finalized.			# TODO move "revlogv2" to openerreqs once finalized.
	if REVLOGV2_REQUIREMENT in self.requirements:			if REVLOGV2_REQUIREMENT in self.requirements:
	self.svfs.options['revlogv2'] = True			self.svfs.options['revlogv2'] = True

mercurial/manifest.py

	# The dirlogcache is kept on the root manifest log			# The dirlogcache is kept on the root manifest log
	if dir:			if dir:
	self._dirlogcache = dirlogcache			self._dirlogcache = dirlogcache
	else:			else:
	self._dirlogcache = {'': self}			self._dirlogcache = {'': self}

	super(manifestrevlog, self).__init__(opener, indexfile,			super(manifestrevlog, self).__init__(opener, indexfile,
	# only root indexfile is cached			# only root indexfile is cached
	checkambig=not bool(dir))			checkambig=not bool(dir),
				mmaplargeindex=True)

	@property			@property
	def fulltextcache(self):			def fulltextcache(self):
	return self._fulltextcache			return self._fulltextcache

	def clearcaches(self):			def clearcaches(self):
	super(manifestrevlog, self).clearcaches()			super(manifestrevlog, self).clearcaches()
	self._fulltextcache.clear()			self._fulltextcache.clear()

mercurial/revlog.py


	Both pieces of the revlog are written to in an append-only			Both pieces of the revlog are written to in an append-only
	fashion, which means we never need to rewrite a file to insert or			fashion, which means we never need to rewrite a file to insert or
	remove data, and can use some simple techniques to avoid the need			remove data, and can use some simple techniques to avoid the need
	for locking while reading.			for locking while reading.

	If checkambig, indexfile is opened with checkambig=True at			If checkambig, indexfile is opened with checkambig=True at
	writing, to avoid file stat ambiguity.			writing, to avoid file stat ambiguity.

				If mmaplargeindex is True, and an mmapindexthreshold is set, the
				index will be mmapped rather than read if it is larger than the
				configured threshold.
	"""			"""
	def __init__(self, opener, indexfile, datafile=None, checkambig=False):			def __init__(self, opener, indexfile, datafile=None, checkambig=False,
				mmaplargeindex=False):
	"""			"""
	create a revlog object			create a revlog object

	opener is a function that abstracts the file opening operation			opener is a function that abstracts the file opening operation
	and can be used to implement COW semantics or the like.			and can be used to implement COW semantics or the like.
	"""			"""
	self.indexfile = indexfile			self.indexfile = indexfile
	self.datafile = datafile or (indexfile[:-2] + ".d")			self.datafile = datafile or (indexfile[:-2] + ".d")
	self.index = []			self.index = []
	# Mapping of partial identifiers to full nodes.			# Mapping of partial identifiers to full nodes.
	self._pcache = {}			self._pcache = {}
	# Mapping of revision integer to full node.			# Mapping of revision integer to full node.
	self._nodecache = {nullid: nullrev}			self._nodecache = {nullid: nullrev}
	self._nodepos = None			self._nodepos = None
	self._compengine = 'zlib'			self._compengine = 'zlib'
	self._maxdeltachainspan = -1			self._maxdeltachainspan = -1

				quarkUnsubmitted Not Done This variable is only used in `__init__` so it is unnecessary to attach it to revlog object. In theory it could make a little difference if there are many revlog objects being created. quark: This variable is only used in `__init__` so it is unnecessary to attach it to revlog object. In…
				mmapindexthreshold = None
	v = REVLOG_DEFAULT_VERSION			v = REVLOG_DEFAULT_VERSION
	opts = getattr(opener, 'options', None)			opts = getattr(opener, 'options', None)
	if opts is not None:			if opts is not None:
	if 'revlogv2' in opts:			if 'revlogv2' in opts:
	# version 2 revlogs always use generaldelta.			# version 2 revlogs always use generaldelta.
	v = REVLOGV2 \| FLAG_GENERALDELTA \| FLAG_INLINE_DATA			v = REVLOGV2 \| FLAG_GENERALDELTA \| FLAG_INLINE_DATA
	elif 'revlogv1' in opts:			elif 'revlogv1' in opts:
	if 'generaldelta' in opts:			if 'generaldelta' in opts:
	v \|= FLAG_GENERALDELTA			v \|= FLAG_GENERALDELTA
	else:			else:
	v = 0			v = 0
	if 'chunkcachesize' in opts:			if 'chunkcachesize' in opts:
	self._chunkcachesize = opts['chunkcachesize']			self._chunkcachesize = opts['chunkcachesize']
	if 'maxchainlen' in opts:			if 'maxchainlen' in opts:
	self._maxchainlen = opts['maxchainlen']			self._maxchainlen = opts['maxchainlen']
	if 'aggressivemergedeltas' in opts:			if 'aggressivemergedeltas' in opts:
	self._aggressivemergedeltas = opts['aggressivemergedeltas']			self._aggressivemergedeltas = opts['aggressivemergedeltas']
	self._lazydeltabase = bool(opts.get('lazydeltabase', False))			self._lazydeltabase = bool(opts.get('lazydeltabase', False))
	if 'compengine' in opts:			if 'compengine' in opts:
	self._compengine = opts['compengine']			self._compengine = opts['compengine']
	if 'maxdeltachainspan' in opts:			if 'maxdeltachainspan' in opts:
	self._maxdeltachainspan = opts['maxdeltachainspan']			self._maxdeltachainspan = opts['maxdeltachainspan']
				if mmaplargeindex and 'mmapindexthreshold' in opts:
				indygregUnsubmitted Not Done We only support 2.7 now. So this version sniffing can be removed. indygreg: We only support 2.7 now. So this version sniffing can be removed.
				mmapindexthreshold = opts['mmapindexthreshold']

	if self._chunkcachesize <= 0:			if self._chunkcachesize <= 0:
	raise RevlogError(_('revlog chunk cache size %r is not greater '			raise RevlogError(_('revlog chunk cache size %r is not greater '
	'than 0') % self._chunkcachesize)			'than 0') % self._chunkcachesize)
	elif self._chunkcachesize & (self._chunkcachesize - 1):			elif self._chunkcachesize & (self._chunkcachesize - 1):
	raise RevlogError(_('revlog chunk cache size %r is not a power '			raise RevlogError(_('revlog chunk cache size %r is not a power '
	'of 2') % self._chunkcachesize)			'of 2') % self._chunkcachesize)

	indexdata = ''			indexdata = ''
	self._initempty = True			self._initempty = True
	try:			try:
	f = self.opener(self.indexfile)			f = self.opener(self.indexfile)
				if (mmapindexthreshold is not None and
				self.opener.fstat(f).st_size >= mmapindexthreshold):
				simonfarUnsubmitted Not Done Is there any reason for `mmapread` to not immediately wrap the data in a `util.buffer` for you? simonfar: Is there any reason for `mmapread` to not immediately wrap the data in a `util.buffer` for you?
				mbthomasAuthorUnsubmitted Not Done I took it from Jun's original patch, but I think it's simply separation of responsibilities. `util.mmapread`'s purpose is to wrap `mmap(... ACCESS_READ)` and handle the case where the file is empty, which normally fails. mbthomas: I took it from Jun's original patch, but I think it's simply separation of responsibilities.
				indexdata = util.buffer(util.mmapread(f))
				durin42Unsubmitted Not Done This makes me very uncomfortable, because util.mmapread() returns the empty string if it doesn't like the file descriptor. I'd be less worried if util.mmapread() crashed, or if this was more cautious about the mmapread failing for some reason. durin42: This makes me very uncomfortable, because util.mmapread() returns the empty string if it…
				else:
	indexdata = f.read()			indexdata = f.read()
	f.close()			f.close()
	if len(indexdata) > 0:			if len(indexdata) > 0:
	v = versionformat_unpack(indexdata[:4])[0]			v = versionformat_unpack(indexdata[:4])[0]
	self._initempty = False			self._initempty = False
	except IOError as inst:			except IOError as inst:
	if inst.errno != errno.ENOENT:			if inst.errno != errno.ENOENT:
	raise			raise


	df = self.opener(self.datafile, 'w')			df = self.opener(self.datafile, 'w')
	try:			try:
	for r in self:			for r in self:
	df.write(self._getsegmentforrevs(r, r)[1])			df.write(self._getsegmentforrevs(r, r)[1])
	finally:			finally:
	df.close()			df.close()

	fp = self.opener(self.indexfile, 'w', atomictemp=True,			fp = self.opener(self.indexfile, 'w', atomictemp=True,
				quarkUnsubmitted Not Done I have checked this `checkinlinesize` code path and believe this patch isn't making things worse. That said, I feel `checkinlinesize` could be troublesome in some cases. And maybe it's safer to move it to a post-close transaction hook. quark: I have checked this `checkinlinesize` code path and believe this patch isn't making things…
	checkambig=self._checkambig)			checkambig=self._checkambig)
	self.version &= ~FLAG_INLINE_DATA			self.version &= ~FLAG_INLINE_DATA
	self._inline = False			self._inline = False
	for i in self:			for i in self:
	e = self._io.packentry(self.index[i], self.node, self.version, i)			e = self._io.packentry(self.index[i], self.node, self.version, i)
	fp.write(e)			fp.write(e)

	# if we don't call close, the temp file will never replace the			# if we don't call close, the temp file will never replace the

tests/test-revlog-mmapindex.t

This file was added.

				create verbosemmap.py
				$ cat << EOF > verbosemmap.py
				> # extension to make util.mmapread verbose
				>
				> from __future__ import absolute_import
				>
				> from mercurial import (
				> extensions,
				> util,
				> )
				>
				> def mmapread(orig, fp):
				> print "mmapping %s" % fp.name
				> return orig(fp)
				simonfarUnsubmitted Not Done Two things: Can you add a `ui.debug()` or similar so that you can show that `mmap()` is in use here? Can you repeat the test without `mmap()` to show that `mmap()` and not-`mmap()` both still work? simonfar: Two things: # Can you add a `ui.debug()` or similar so that you can show that `mmap()` is in…
				mbthomasAuthorUnsubmitted Not Done For (1) There's no `ui` object available in the `revlog.revlog` constructor. Is there a way to get one? For (2), the rest of the test suite will be loading the revlog without mmap, so I didn't think it necessary to test it again here. mbthomas: For (1) There's no `ui` object available in the `revlog.revlog` constructor. Is there a way to…
				indygregUnsubmitted Not Done I'd do it with inline Python. Something like: from mercurial import hg, ui as uimod myui = uimod.ui.load() repo = hg.repository(myui, path='.') Test repo.changelog here. Also, excessive `hg` commands makes tests slow. Unfortunately, doing this in Python is probably a bit of work :/ indygreg: I'd do it with inline Python. Something like: >>> from mercurial import hg, ui as uimod >>>…
				>
				> def extsetup(ui):
				quarkUnsubmitted Not Done In this case `verbosemmap.py` is not very useful in other tests. The common pattern is to make it inside the `.t` file: $ cat > verbosemmap.py <<EOF > ... > EOF $ cat >> $HGRCPATH.py << EOF > ... > verbosemmap.py=$TESTTMP/verbosemmap.py > EOF quark: In this case `verbosemmap.py` is not very useful in other tests. The common pattern is to make…
				> extensions.wrapfunction(util, 'mmapread', mmapread)
				> EOF

				setting up base repo
				$ hg init a
				$ cd a
				$ touch a
				$ hg add a
				$ hg commit -qm base
				$ for i in `$TESTDIR/seq.py 1 100` ; do
				> echo $i > a
				> hg commit -qm $i
				> done

				set up verbosemmap extension
				$ cat << EOF >> $HGRCPATH
				> [extensions]
				> verbosemmap=$TESTTMP/verbosemmap.py
				> EOF

				mmap index which is now more than 4k long
				$ hg log -l 5 -T '{rev}\n' --config experimental.mmapindexthreshold=4k
				mmapping $TESTTMP/a/.hg/store/00changelog.i (glob)
				100
				99
				98
				97
				96

				do not mmap index which is still less than 32k
				$ hg log -l 5 -T '{rev}\n' --config experimental.mmapindexthreshold=32k
				100
				99
				98
				97
				96

				$ cd ..

		Path
M		mercurial/changelog.py (2 lines)
M		mercurial/localrepo.py (4 lines)
M		mercurial/manifest.py (3 lines)
M		mercurial/revlog.py (16 lines)
A	M	tests/test-revlog-mmapindex.t (54 lines)

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revlog: add option to mmap revlog index
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mercurial/changelog.py

mercurial/localrepo.py

mercurial/manifest.py

mercurial/revlog.py

tests/test-revlog-mmapindex.t

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mercurial/changelog.py

mercurial/localrepo.py

mercurial/manifest.py

mercurial/revlog.py

tests/test-revlog-mmapindex.t

revlog: add option to mmap revlog index
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