# perf.py - performance test routines

'''helper extension to measure performance'''

from mercurial import cmdutil, scmutil, match, commands

import time, os, sys

def timer(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

    if title:

        sys.stderr.write("! %s\n" % title)

    if r:

        sys.stderr.write("! result: %s\n" % r)

    m = min(results)

    sys.stderr.write("! wall %f comb %f user %f sys %f (best of %d)\n"

                     % (m[0], m[1] + m[2], m[1], m[2], count))

def perfwalk(ui, repo, *pats):

    try:

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

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

    except:

        try:

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

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

        except:

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

def perfstatus(ui, repo, *pats):

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

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

    timer(lambda: sum(map(len, repo.status())))

def perfheads(ui, repo):

    timer(lambda: len(repo.changelog.headrevs()))

def perftags(ui, repo):

    import mercurial.changelog, mercurial.manifest

    def t():

        repo.changelog = mercurial.changelog.changelog(repo.sopener)

        repo.manifest = mercurial.manifest.manifest(repo.sopener)

        repo._tags = None

        return len(repo.tags())

    timer(t)

def perfdirstate(ui, repo):

    "a" in repo.dirstate

    def d():

        repo.dirstate.invalidate()

        "a" in repo.dirstate

    timer(d)

def perfdirstatedirs(ui, repo):

    "a" in repo.dirstate

    def d():

        "a" in repo.dirstate._dirs

        del repo.dirstate._dirs

    timer(d)

def perfmanifest(ui, repo):

    def d():

        t = repo.manifest.tip()

        m = repo.manifest.read(t)

        repo.manifest.mapcache = None

        repo.manifest._cache = None

    timer(d)

def perfchangeset(ui, repo, rev):

    n = repo[rev].node()

    def d():

        c = repo.changelog.read(n)

        #repo.changelog._cache = None

    timer(d)

def perfindex(ui, repo):

    import mercurial.revlog

    mercurial.revlog._prereadsize = 2**24 # disable lazy parser in old hg

    n = repo["tip"].node()

    def d():

        cl = mercurial.revlog.revlog(repo.sopener, "00changelog.i")

        cl.rev(n)

    timer(d)

def perfstartup(ui, repo):

    cmd = sys.argv[0]

    def d():

        os.system("HGRCPATH= %s version -q > /dev/null" % cmd)

    timer(d)

def perfparents(ui, repo):

    nl = [repo.changelog.node(i) for i in xrange(1000)]

    def d():

        for n in nl:

            repo.changelog.parents(n)

    timer(d)

def perflookup(ui, repo, rev):

    timer(lambda: len(repo.lookup(rev)))

def perfnodelookup(ui, repo, rev):

    import mercurial.revlog

    mercurial.revlog._prereadsize = 2**24 # disable lazy parser in old hg

    n = repo[rev].node()

    def d():

        cl = mercurial.revlog.revlog(repo.sopener, "00changelog.i")

        cl.rev(n)

    timer(d)

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

    ui.pushbuffer()

    timer(lambda: commands.log(ui, repo, rev=[], date='', user='',

                               copies=opts.get('rename')))

    ui.popbuffer()

def perftemplating(ui, repo):

    ui.pushbuffer()

    timer(lambda: commands.log(ui, repo, rev=[], date='', user='',

                               template='{date|shortdate} [{rev}:{node|short}]'

                               ' {author|person}: {desc|firstline}\n'))

    ui.popbuffer()

def perfdiffwd(ui, repo):

    """Profile diff of working directory changes"""

    options = {

        'w': 'ignore_all_space',

        'b': 'ignore_space_change',

        'B': 'ignore_blank_lines',

        }

    for diffopt in ('', 'w', 'b', 'B', 'wB'):

        opts = dict((options[c], '1') for c in diffopt)

        def d():

            ui.pushbuffer()

            commands.diff(ui, repo, **opts)

            ui.popbuffer()

        title = 'diffopts: %s' % (diffopt and ('-' + diffopt) or 'none')

        timer(d, title)

def perfrevlog(ui, repo, file_, **opts):

    from mercurial import revlog

    dist = opts['dist']

    def d():

        r = revlog.revlog(lambda fn: open(fn, 'rb'), file_)

        for x in xrange(0, len(r), dist):

            r.revision(r.node(x))

    timer(d)

cmdtable = {

    'perflookup': (perflookup, []),

    'perfnodelookup': (perfnodelookup, []),

    'perfparents': (perfparents, []),

    'perfstartup': (perfstartup, []),

    'perfstatus': (perfstatus, []),

    'perfwalk': (perfwalk, []),

    'perfmanifest': (perfmanifest, []),

    'perfchangeset': (perfchangeset, []),

    'perfindex': (perfindex, []),

    'perfheads': (perfheads, []),

    'perftags': (perftags, []),

    'perfdirstate': (perfdirstate, []),

    'perfdirstatedirs': (perfdirstate, []),

    'perflog': (perflog,

                [('', 'rename', False, 'ask log to follow renames')]),

    'perftemplating': (perftemplating, []),

    'perfdiffwd': (perfdiffwd, []),

    'perfrevlog': (perfrevlog,

                   [('d', 'dist', 100, 'distance between the revisions')],

                   "[INDEXFILE]"),

}