# perf.py - performance test routines

'''helper extension to measure performance'''

# "historical portability" policy of perf.py:

#

# We have to do:

# - make perf.py "loadable" with as wide Mercurial version as possible

#   This doesn't mean that perf commands work correctly with that Mercurial.

#   BTW, perf.py itself has been available since 1.1 (or eb240755386d).

# - make historical perf command work correctly with as wide Mercurial

#   version as possible

#

# We have to do, if possible with reasonable cost:

# - make recent perf command for historical feature work correctly

#   with early Mercurial

#

# We don't have to do:

# - make perf command for recent feature work correctly with early

#   Mercurial

from __future__ import absolute_import

import functools

import os

import random

import sys

import time

from mercurial import (

    changegroup,

    cmdutil,

    commands,

    copies,

    error,

    extensions,

    mdiff,

    merge,

    revlog,

    util,

)

# for "historical portability":

# try to import modules separately (in dict order), and ignore

# failure, because these aren't available with early Mercurial

try:

    from mercurial import branchmap # since 2.5 (or bcee63733aad)

except ImportError:

    pass

try:

    from mercurial import obsolete # since 2.3 (or ad0d6c2b3279)

except ImportError:

    pass

try:

    from mercurial import repoview # since 2.5 (or 3a6ddacb7198)

except ImportError:

    pass

try:

    from mercurial import scmutil # since 1.9 (or 8b252e826c68)

except ImportError:

    pass

# for "historical portability":

# define util.safehasattr forcibly, because util.safehasattr has been

# available since 1.9.3 (or 94b200a11cf7)

_undefined = object()

def safehasattr(thing, attr):

    return getattr(thing, attr, _undefined) is not _undefined

setattr(util, 'safehasattr', safehasattr)

# for "historical portability":

# use locally defined empty option list, if formatteropts isn't

# available, because commands.formatteropts has been available since

# 3.2 (or 7a7eed5176a4), even though formatting itself has been

# available since 2.2 (or ae5f92e154d3)

formatteropts = getattr(commands, "formatteropts", [])

# for "historical portability":

# use locally defined option list, if debugrevlogopts isn't available,

# because commands.debugrevlogopts has been available since 3.7 (or

# 5606f7d0d063), even though cmdutil.openrevlog() has been available

# since 1.9 (or a79fea6b3e77).

revlogopts = getattr(commands, "debugrevlogopts", [

        ('c', 'changelog', False, ('open changelog')),

        ('m', 'manifest', False, ('open manifest')),

        ('', 'dir', False, ('open directory manifest')),

        ])

cmdtable = {}

# for "historical portability":

# define parsealiases locally, because cmdutil.parsealiases has been

# available since 1.5 (or 6252852b4332)

def parsealiases(cmd):

    return cmd.lstrip("^").split("|")

if safehasattr(cmdutil, 'command'):

    import inspect

    command = cmdutil.command(cmdtable)

    if 'norepo' not in inspect.getargspec(command)[0]:

        # for "historical portability":

        # wrap original cmdutil.command, because "norepo" option has

        # been available since 3.1 (or 75a96326cecb)

        _command = command

        def command(name, options=(), synopsis=None, norepo=False):

            if norepo:

                commands.norepo += ' %s' % ' '.join(parsealiases(name))

            return _command(name, list(options), synopsis)

else:

    # for "historical portability":

    # define "@command" annotation locally, because cmdutil.command

    # has been available since 1.9 (or 2daa5179e73f)

    def command(name, options=(), synopsis=None, norepo=False):

        def decorator(func):

            if synopsis:

                cmdtable[name] = func, list(options), synopsis

            else:

                cmdtable[name] = func, list(options)

            if norepo:

                commands.norepo += ' %s' % ' '.join(parsealiases(name))

            return func

        return decorator

def getlen(ui):

    if ui.configbool("perf", "stub"):

        return lambda x: 1

    return len

def gettimer(ui, opts=None):

    """return a timer function and formatter: (timer, formatter)

    This function exists to gather the creation of formatter in a single

    place instead of duplicating it in all performance commands."""

    # enforce an idle period before execution to counteract power management

    # experimental config: perf.presleep

    time.sleep(ui.configint("perf", "presleep", 1))

    if opts is None:

        opts = {}

    # redirect all to stderr

    ui = ui.copy()

    ui.fout = ui.ferr

    # get a formatter

    fm = ui.formatter('perf', opts)

    # stub function, runs code only once instead of in a loop

    # experimental config: perf.stub

    if ui.configbool("perf", "stub"):

        return functools.partial(stub_timer, fm), fm

    return functools.partial(_timer, fm), fm

def stub_timer(fm, func, title=None):

    func()

def _timer(fm, func, title=None):

    results = []

    begin = time.time()

    count = 0

    while True:

        ostart = os.times()

        cstart = time.time()

        r = func()

        cstop = time.time()

        ostop = os.times()

        count += 1

        a, b = ostart, ostop

        results.append((cstop - cstart, b[0] - a[0], b[1]-a[1]))

        if cstop - begin > 3 and count >= 100:

            break

        if cstop - begin > 10 and count >= 3:

            break

    fm.startitem()

    if title:

        fm.write('title', '! %s\n', title)

    if r:

        fm.write('result', '! result: %s\n', r)

    m = min(results)

    fm.plain('!')

    fm.write('wall', ' wall %f', m[0])

    fm.write('comb', ' comb %f', m[1] + m[2])

    fm.write('user', ' user %f', m[1])

    fm.write('sys',  ' sys %f', m[2])

    fm.write('count',  ' (best of %d)', count)

    fm.plain('\n')

@command('perfwalk', formatteropts)

def perfwalk(ui, repo, *pats, **opts):

    timer, fm = gettimer(ui, opts)

    try:

        m = scmutil.match(repo[None], pats, {})

        timer(lambda: len(list(repo.dirstate.walk(m, [], True, False))))

    except Exception:

        try:

            m = scmutil.match(repo[None], pats, {})

            timer(lambda: len([b for a, b, c in repo.dirstate.statwalk([], m)]))

        except Exception:

            timer(lambda: len(list(cmdutil.walk(repo, pats, {}))))

    fm.end()

@command('perfannotate', formatteropts)

def perfannotate(ui, repo, f, **opts):

    timer, fm = gettimer(ui, opts)

    fc = repo['.'][f]

    timer(lambda: len(fc.annotate(True)))

    fm.end()

@command('perfstatus',

         [('u', 'unknown', False,

           'ask status to look for unknown files')] + formatteropts)

def perfstatus(ui, repo, **opts):

    #m = match.always(repo.root, repo.getcwd())

    #timer(lambda: sum(map(len, repo.dirstate.status(m, [], False, False,

    #                                                False))))

    timer, fm = gettimer(ui, opts)

    timer(lambda: sum(map(len, repo.status(unknown=opts['unknown']))))

    fm.end()

@command('perfaddremove', formatteropts)

def perfaddremove(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    try:

        oldquiet = repo.ui.quiet

        repo.ui.quiet = True

        matcher = scmutil.match(repo[None])

        timer(lambda: scmutil.addremove(repo, matcher, "", dry_run=True))

    finally:

        repo.ui.quiet = oldquiet

        fm.end()

def clearcaches(cl):

    # behave somewhat consistently across internal API changes

    if util.safehasattr(cl, 'clearcaches'):

        cl.clearcaches()

    elif util.safehasattr(cl, '_nodecache'):

        from mercurial.node import nullid, nullrev

        cl._nodecache = {nullid: nullrev}

        cl._nodepos = None

@command('perfheads', formatteropts)

def perfheads(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    cl = repo.changelog

    def d():

        len(cl.headrevs())

        clearcaches(cl)

    timer(d)

    fm.end()

@command('perftags', formatteropts)

def perftags(ui, repo, **opts):

    import mercurial.changelog

    import mercurial.manifest

    timer, fm = gettimer(ui, opts)

    def t():

        repo.changelog = mercurial.changelog.changelog(repo.svfs)

        repo.manifest = mercurial.manifest.manifest(repo.svfs)

        repo._tags = None

        return len(repo.tags())

    timer(t)

    fm.end()

@command('perfancestors', formatteropts)

def perfancestors(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    heads = repo.changelog.headrevs()

    def d():

        for a in repo.changelog.ancestors(heads):

            pass

    timer(d)

    fm.end()

@command('perfancestorset', formatteropts)

def perfancestorset(ui, repo, revset, **opts):

    timer, fm = gettimer(ui, opts)

    revs = repo.revs(revset)

    heads = repo.changelog.headrevs()

    def d():

        s = repo.changelog.ancestors(heads)

        for rev in revs:

            rev in s

    timer(d)

    fm.end()

@command('perfchangegroupchangelog', formatteropts +

         [('', 'version', '02', 'changegroup version'),

          ('r', 'rev', '', 'revisions to add to changegroup')])

def perfchangegroupchangelog(ui, repo, version='02', rev=None, **opts):

    """Benchmark producing a changelog group for a changegroup.

    This measures the time spent processing the changelog during a

    bundle operation. This occurs during `hg bundle` and on a server

    processing a `getbundle` wire protocol request (handles clones

    and pull requests).

    By default, all revisions are added to the changegroup.

    """

    cl = repo.changelog

    revs = [cl.lookup(r) for r in repo.revs(rev or 'all()')]

    bundler = changegroup.getbundler(version, repo)

    def lookup(node):

        # The real bundler reads the revision in order to access the

        # manifest node and files list. Do that here.

        cl.read(node)

        return node

    def d():

        for chunk in bundler.group(revs, cl, lookup):

            pass

    timer, fm = gettimer(ui, opts)

    timer(d)

    fm.end()

@command('perfdirs', formatteropts)

def perfdirs(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    dirstate = repo.dirstate

    'a' in dirstate

    def d():

        dirstate.dirs()

        del dirstate._dirs

    timer(d)

    fm.end()

@command('perfdirstate', formatteropts)

def perfdirstate(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    "a" in repo.dirstate

    def d():

        repo.dirstate.invalidate()

        "a" in repo.dirstate

    timer(d)

    fm.end()

@command('perfdirstatedirs', formatteropts)

def perfdirstatedirs(ui, repo, **opts):

    timer, fm = gettimer(ui, opts)

    "a" in repo.dirstate

    def d():

        "a" in repo.dirstate._dirs

        del repo.dirstate._dirs

    timer(d)

    fm.end()

@command('perfdirstatefoldmap', formatteropts)