Mercurial > hg
view hgext/show.py @ 42044:bb271ec2fbfb
compression: introduce a `storage.revlog.zstd.level` configuration
This option control the zstd compression level used when compressing revlog
chunk. The usage of zstd for revlog compression has not graduated from
experimental yet, but we intend to fix that soon.
The option name for the compression level is more straight forward to pick, so
this changesets comes first. Having a dedicated option for each compression
engine is useful because they don't support the same range of values.
I ran the same measurement as for the zlib compression level (in the parent
changesets). The variation in repository size is stay mostly in the same (small)
range. The "read/write" performance see smallish variation, but are overall much
better than zlib. Write performance show the same tend of having better write
performance for when reaching high-end compression.
Again, we don't intend to change the default zstd compression level (currently:
3) in this series. However this is worth investigating in the future.
The Performance comparison of zlib vs zstd is quite impressive. The repository
size stay in the same range, but the performance are much better in all
situations.
Comparison summary
==================
We are looking at:
- performance range for zlib
- performance range for zstd
- comparison of default zstd (level-3) to default zlib (level 6)
- comparison of the slowest zstd time to the fastest zlib time
Read performance:
-----------------
| zlib | zstd | cmp | f2s
mercurial | 0.170159 - 0.189219 | 0.144127 - 0.149624 | 80% | 88%
pypy | 2.679217 - 2.768691 | 1.532317 - 1.705044 | 60% | 63%
netbeans | 122.477027 - 141.620281 | 72.996346 - 89.731560 | 58% | 73%
mozilla | 147.867662 - 170.572118 | 91.700995 - 105.853099 | 56% | 71%
Write performance:
------------------
| zlib | zstd | cmp | f2s
mercurial | 53.250304 - 56.2936129 | 40.877025 - 45.677286 | 75% | 86%
pypy | 460.721984 - 476.589918 | 270.545409 - 301.002219 | 63% | 65%
netbeans | 520.560316 - 715.930400 | 370.356311 - 428.329652 | 55% | 82%
mozilla | 739.803002 - 987.056093 | 505.152906 - 591.930683 | 57% | 80%
Raw data
--------
repo alg lvl .hg/store size 00manifest.d read write
mercurial zlib 1 49,402,813 5,963,475 0.170159 53.250304
mercurial zlib 6 47,197,397 5,875,730 0.182820 56.264320
mercurial zlib 9 47,121,596 5,849,781 0.189219 56.293612
mercurial zstd 1 49,737,084 5,966,355 0.144127 40.877025
mercurial zstd 3 48,961,867 5,895,208 0.146376 42.268142
mercurial zstd 5 48,200,592 5,938,676 0.149624 43.162875
mercurial zstd 10 47,833,520 5,913,353 0.145185 44.012489
mercurial zstd 15 47,314,604 5,728,679 0.147686 45.677286
mercurial zstd 20 47,330,502 5,830,539 0.145789 45.025407
mercurial zstd 22 47,330,076 5,830,539 0.143996 44.690460
pypy zlib 1 370,830,572 28,462,425 2.679217 460.721984
pypy zlib 6 340,112,317 27,648,747 2.768691 467.537158
pypy zlib 9 338,360,736 27,639,003 2.763495 476.589918
pypy zstd 1 362,377,479 27,916,214 1.532317 270.545409
pypy zstd 3 354,137,693 27,905,988 1.686718 294.951509
pypy zstd 5 342,640,043 27,655,774 1.705044 301.002219
pypy zstd 10 334,224,327 27,164,493 1.567287 285.186239
pypy zstd 15 329,000,363 26,645,965 1.637729 299.561332
pypy zstd 20 324,534,039 26,199,547 1.526813 302.149827
pypy zstd 22 324,530,595 26,198,932 1.525718 307.821218
netbeans zlib 1 1,281,847,810 165,495,457 122.477027 520.560316
netbeans zlib 6 1,205,284,353 159,161,207 139.876147 715.930400
netbeans zlib 9 1,197,135,671 155,034,586 141.620281 678.297064
netbeans zstd 1 1,259,581,737 160,840,613 72.996346 370.356311
netbeans zstd 3 1,232,978,122 157,691,551 81.622317 396.733087
netbeans zstd 5 1,208,034,075 160,246,880 83.080549 364.342626
netbeans zstd 10 1,188,624,176 156,083,417 79.323935 403.594602
netbeans zstd 15 1,176,973,589 153,859,477 89.731560 428.329652
netbeans zstd 20 1,162,958,258 151,147,535 82.842667 392.335349
netbeans zstd 22 1,162,707,029 151,150,220 82.565695 402.840655
mozilla zlib 1 2,775,497,186 298,527,987 147.867662 751.263721
mozilla zlib 6 2,596,856,420 286,597,671 170.572118 987.056093
mozilla zlib 9 2,587,542,494 287,018,264 163.622338 739.803002
mozilla zstd 1 2,723,159,348 286,617,532 91.700995 570.042751
mozilla zstd 3 2,665,055,001 286,152,013 95.240155 561.412805
mozilla zstd 5 2,607,819,817 288,060,030 101.978048 505.152906
mozilla zstd 10 2,558,761,085 283,967,648 104.113481 497.771202
mozilla zstd 15 2,526,216,060 275,581,300 105.853099 591.930683
mozilla zstd 20 2,485,114,806 266,478,859 95.268795 576.515389
mozilla zstd 22 2,484,869,080 266,456,505 94.429282 572.785537
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Wed, 27 Mar 2019 18:35:59 +0100 |
parents | c303d65d2e34 |
children | 566daffc607d |
line wrap: on
line source
# show.py - Extension implementing `hg show` # # Copyright 2017 Gregory Szorc <gregory.szorc@gmail.com> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """unified command to show various repository information (EXPERIMENTAL) This extension provides the :hg:`show` command, which provides a central command for displaying commonly-accessed repository data and views of that data. The following config options can influence operation. ``commands`` ------------ ``show.aliasprefix`` List of strings that will register aliases for views. e.g. ``s`` will effectively set config options ``alias.s<view> = show <view>`` for all views. i.e. `hg swork` would execute `hg show work`. Aliases that would conflict with existing registrations will not be performed. """ from __future__ import absolute_import from mercurial.i18n import _ from mercurial.node import ( nullrev, ) from mercurial import ( cmdutil, commands, destutil, error, formatter, graphmod, logcmdutil, phases, pycompat, registrar, revset, revsetlang, scmutil, ) # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should # be specifying the version(s) of Mercurial they are tested with, or # leave the attribute unspecified. testedwith = 'ships-with-hg-core' cmdtable = {} command = registrar.command(cmdtable) revsetpredicate = registrar.revsetpredicate() class showcmdfunc(registrar._funcregistrarbase): """Register a function to be invoked for an `hg show <thing>`.""" # Used by _formatdoc(). _docformat = '%s -- %s' def _extrasetup(self, name, func, fmtopic=None, csettopic=None): """Called with decorator arguments to register a show view. ``name`` is the sub-command name. ``func`` is the function being decorated. ``fmtopic`` is the topic in the style that will be rendered for this view. ``csettopic`` is the topic in the style to be used for a changeset printer. If ``fmtopic`` is specified, the view function will receive a formatter instance. If ``csettopic`` is specified, the view function will receive a changeset printer. """ func._fmtopic = fmtopic func._csettopic = csettopic showview = showcmdfunc() @command('show', [ # TODO: Switch this template flag to use cmdutil.formatteropts if # 'hg show' becomes stable before --template/-T is stable. For now, # we are putting it here without the '(EXPERIMENTAL)' flag because it # is an important part of the 'hg show' user experience and the entire # 'hg show' experience is experimental. ('T', 'template', '', ('display with template'), _('TEMPLATE')), ], _('VIEW'), helpcategory=command.CATEGORY_CHANGE_NAVIGATION) def show(ui, repo, view=None, template=None): """show various repository information A requested view of repository data is displayed. If no view is requested, the list of available views is shown and the command aborts. .. note:: There are no backwards compatibility guarantees for the output of this command. Output may change in any future Mercurial release. Consumers wanting stable command output should specify a template via ``-T/--template``. List of available views: """ if ui.plain() and not template: hint = _('invoke with -T/--template to control output format') raise error.Abort(_('must specify a template in plain mode'), hint=hint) views = showview._table if not view: ui.pager('show') # TODO consider using formatter here so available views can be # rendered to custom format. ui.write(_('available views:\n')) ui.write('\n') for name, func in sorted(views.items()): ui.write(('%s\n') % pycompat.sysbytes(func.__doc__)) ui.write('\n') raise error.Abort(_('no view requested'), hint=_('use "hg show VIEW" to choose a view')) # TODO use same logic as dispatch to perform prefix matching. if view not in views: raise error.Abort(_('unknown view: %s') % view, hint=_('run "hg show" to see available views')) template = template or 'show' fn = views[view] ui.pager('show') if fn._fmtopic: fmtopic = 'show%s' % fn._fmtopic with ui.formatter(fmtopic, {'template': template}) as fm: return fn(ui, repo, fm) elif fn._csettopic: ref = 'show%s' % fn._csettopic spec = formatter.lookuptemplate(ui, ref, template) displayer = logcmdutil.changesettemplater(ui, repo, spec, buffered=True) return fn(ui, repo, displayer) else: return fn(ui, repo) @showview('bookmarks', fmtopic='bookmarks') def showbookmarks(ui, repo, fm): """bookmarks and their associated changeset""" marks = repo._bookmarks if not len(marks): # This is a bit hacky. Ideally, templates would have a way to # specify an empty output, but we shouldn't corrupt JSON while # waiting for this functionality. if not isinstance(fm, formatter.jsonformatter): ui.write(_('(no bookmarks set)\n')) return revs = [repo[node].rev() for node in marks.values()] active = repo._activebookmark longestname = max(len(b) for b in marks) nodelen = longestshortest(repo, revs) for bm, node in sorted(marks.items()): fm.startitem() fm.context(ctx=repo[node]) fm.write('bookmark', '%s', bm) fm.write('node', fm.hexfunc(node), fm.hexfunc(node)) fm.data(active=bm == active, longestbookmarklen=longestname, nodelen=nodelen) @showview('stack', csettopic='stack') def showstack(ui, repo, displayer): """current line of work""" wdirctx = repo['.'] if wdirctx.rev() == nullrev: raise error.Abort(_('stack view only available when there is a ' 'working directory')) if wdirctx.phase() == phases.public: ui.write(_('(empty stack; working directory parent is a published ' 'changeset)\n')) return # TODO extract "find stack" into a function to facilitate # customization and reuse. baserev = destutil.stackbase(ui, repo) basectx = None if baserev is None: baserev = wdirctx.rev() stackrevs = {wdirctx.rev()} else: stackrevs = set(repo.revs('%d::.', baserev)) ctx = repo[baserev] if ctx.p1().rev() != nullrev: basectx = ctx.p1() # And relevant descendants. branchpointattip = False cl = repo.changelog for rev in cl.descendants([wdirctx.rev()]): ctx = repo[rev] # Will only happen if . is public. if ctx.phase() == phases.public: break stackrevs.add(ctx.rev()) # ctx.children() within a function iterating on descandants # potentially has severe performance concerns because revlog.children() # iterates over all revisions after ctx's node. However, the number of # draft changesets should be a reasonably small number. So even if # this is quadratic, the perf impact should be minimal. if len(ctx.children()) > 1: branchpointattip = True break stackrevs = list(sorted(stackrevs, reverse=True)) # Find likely target heads for the current stack. These are likely # merge or rebase targets. if basectx: # TODO make this customizable? newheads = set(repo.revs('heads(%d::) - %ld - not public()', basectx.rev(), stackrevs)) else: newheads = set() allrevs = set(stackrevs) | newheads | set([baserev]) nodelen = longestshortest(repo, allrevs) try: cmdutil.findcmd('rebase', commands.table) haverebase = True except (error.AmbiguousCommand, error.UnknownCommand): haverebase = False # TODO use templating. # TODO consider using graphmod. But it may not be necessary given # our simplicity and the customizations required. # TODO use proper graph symbols from graphmod tres = formatter.templateresources(ui, repo) shortesttmpl = formatter.maketemplater(ui, '{shortest(node, %d)}' % nodelen, resources=tres) def shortest(ctx): return shortesttmpl.renderdefault({'ctx': ctx, 'node': ctx.hex()}) # We write out new heads to aid in DAG awareness and to help with decision # making on how the stack should be reconciled with commits made since the # branch point. if newheads: # Calculate distance from base so we can render the count and so we can # sort display order by commit distance. revdistance = {} for head in newheads: # There is some redundancy in DAG traversal here and therefore # room to optimize. ancestors = cl.ancestors([head], stoprev=basectx.rev()) revdistance[head] = len(list(ancestors)) sourcectx = repo[stackrevs[-1]] sortedheads = sorted(newheads, key=lambda x: revdistance[x], reverse=True) for i, rev in enumerate(sortedheads): ctx = repo[rev] if i: ui.write(': ') else: ui.write(' ') ui.write(('o ')) displayer.show(ctx, nodelen=nodelen) displayer.flush(ctx) ui.write('\n') if i: ui.write(':/') else: ui.write(' /') ui.write(' (') ui.write(_('%d commits ahead') % revdistance[rev], label='stack.commitdistance') if haverebase: # TODO may be able to omit --source in some scenarios ui.write('; ') ui.write(('hg rebase --source %s --dest %s' % ( shortest(sourcectx), shortest(ctx))), label='stack.rebasehint') ui.write(')\n') ui.write(':\n: ') ui.write(_('(stack head)\n'), label='stack.label') if branchpointattip: ui.write(' \\ / ') ui.write(_('(multiple children)\n'), label='stack.label') ui.write(' |\n') for rev in stackrevs: ctx = repo[rev] symbol = '@' if rev == wdirctx.rev() else 'o' if newheads: ui.write(': ') else: ui.write(' ') ui.write(symbol, ' ') displayer.show(ctx, nodelen=nodelen) displayer.flush(ctx) ui.write('\n') # TODO display histedit hint? if basectx: # Vertically and horizontally separate stack base from parent # to reinforce stack boundary. if newheads: ui.write(':/ ') else: ui.write(' / ') ui.write(_('(stack base)'), '\n', label='stack.label') ui.write(('o ')) displayer.show(basectx, nodelen=nodelen) displayer.flush(basectx) ui.write('\n') @revsetpredicate('_underway([commitage[, headage]])') def underwayrevset(repo, subset, x): args = revset.getargsdict(x, 'underway', 'commitage headage') if 'commitage' not in args: args['commitage'] = None if 'headage' not in args: args['headage'] = None # We assume callers of this revset add a topographical sort on the # result. This means there is no benefit to making the revset lazy # since the topographical sort needs to consume all revs. # # With this in mind, we build up the set manually instead of constructing # a complex revset. This enables faster execution. # Mutable changesets (non-public) are the most important changesets # to return. ``not public()`` will also pull in obsolete changesets if # there is a non-obsolete changeset with obsolete ancestors. This is # why we exclude obsolete changesets from this query. rs = 'not public() and not obsolete()' rsargs = [] if args['commitage']: rs += ' and date(%s)' rsargs.append(revsetlang.getstring(args['commitage'], _('commitage requires a string'))) mutable = repo.revs(rs, *rsargs) relevant = revset.baseset(mutable) # Add parents of mutable changesets to provide context. relevant += repo.revs('parents(%ld)', mutable) # We also pull in (public) heads if they a) aren't closing a branch # b) are recent. rs = 'head() and not closed()' rsargs = [] if args['headage']: rs += ' and date(%s)' rsargs.append(revsetlang.getstring(args['headage'], _('headage requires a string'))) relevant += repo.revs(rs, *rsargs) # Add working directory parent. wdirrev = repo['.'].rev() if wdirrev != nullrev: relevant += revset.baseset({wdirrev}) return subset & relevant @showview('work', csettopic='work') def showwork(ui, repo, displayer): """changesets that aren't finished""" # TODO support date-based limiting when calling revset. revs = repo.revs('sort(_underway(), topo)') nodelen = longestshortest(repo, revs) revdag = graphmod.dagwalker(repo, revs) ui.setconfig('experimental', 'graphshorten', True) logcmdutil.displaygraph(ui, repo, revdag, displayer, graphmod.asciiedges, props={'nodelen': nodelen}) def extsetup(ui): # Alias `hg <prefix><view>` to `hg show <view>`. for prefix in ui.configlist('commands', 'show.aliasprefix'): for view in showview._table: name = '%s%s' % (prefix, view) choice, allcommands = cmdutil.findpossible(name, commands.table, strict=True) # This alias is already a command name. Don't set it. if name in choice: continue # Same for aliases. if ui.config('alias', name, None): continue ui.setconfig('alias', name, 'show %s' % view, source='show') def longestshortest(repo, revs, minlen=4): """Return the length of the longest shortest node to identify revisions. The result of this function can be used with the ``shortest()`` template function to ensure that a value is unique and unambiguous for a given set of nodes. The number of revisions in the repo is taken into account to prevent a numeric node prefix from conflicting with an integer revision number. If we fail to do this, a value of e.g. ``10023`` could mean either revision 10023 or node ``10023abc...``. """ if not revs: return minlen cl = repo.changelog return max(len(scmutil.shortesthexnodeidprefix(repo, cl.node(r), minlen)) for r in revs) # Adjust the docstring of the show command so it shows all registered views. # This is a bit hacky because it runs at the end of module load. When moved # into core or when another extension wants to provide a view, we'll need # to do this more robustly. # TODO make this more robust. def _updatedocstring(): longest = max(map(len, showview._table.keys())) entries = [] for key in sorted(showview._table.keys()): entries.append(pycompat.sysstr(' %s %s' % ( key.ljust(longest), showview._table[key]._origdoc))) cmdtable['show'][0].__doc__ = pycompat.sysstr('%s\n\n%s\n ') % ( cmdtable['show'][0].__doc__.rstrip(), pycompat.sysstr('\n\n').join(entries)) _updatedocstring()