view contrib/hgperf @ 40374:47c03042cd1d

branchmap: pass changelog into branchmap functions As part of building the branchmap, we loop over revs and call branchmap() or _branchmap(). Previously, these functions were accessing repo.changelog. We know from past experience that repo.changelog in loops is bad for performance. This commit teaches the branchmap code to pass a changelog instance into branchmap() and _branchmap() so we don't need to pay this penalty. On my MBP, this appears to show a speedup on a clone of the mozilla-unified repo: $ hg perfbranchmap --clear-revbranch ! base ! wall 21.078160 comb 21.070000 user 20.920000 sys 0.150000 (best of 3) ! wall 20.574682 comb 20.560000 user 20.400000 sys 0.160000 (best of 3) $ hg perfbranchmap ! base ! wall 4.880413 comb 4.870000 user 4.860000 sys 0.010000 (best of 3) ! wall 4.573968 comb 4.560000 user 4.550000 sys 0.010000 (best of 3) Differential Revision: https://phab.mercurial-scm.org/D5161
author Gregory Szorc <gregory.szorc@gmail.com>
date Fri, 19 Oct 2018 16:16:17 +0200
parents 163fa0aea71e
children 99e231afc29c
line wrap: on
line source

#!/usr/bin/env python
#
# hgperf - measure performance of Mercurial commands
#
# Copyright 2014 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

'''measure performance of Mercurial commands

Using ``hgperf`` instead of ``hg`` measures performance of the target
Mercurial command. For example, the execution below measures
performance of :hg:`heads --topo`::

    $ hgperf heads --topo

All command output via ``ui`` is suppressed, and just measurement
result is displayed: see also "perf" extension in "contrib".

Costs of processing before dispatching to the command function like
below are not measured::

    - parsing command line (e.g. option validity check)
    - reading configuration files in

But ``pre-`` and ``post-`` hook invocation for the target command is
measured, even though these are invoked before or after dispatching to
the command function, because these may be required to repeat
execution of the target command correctly.
'''

import os
import sys

libdir = '@LIBDIR@'

if libdir != '@' 'LIBDIR' '@':
    if not os.path.isabs(libdir):
        libdir = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                              libdir)
        libdir = os.path.abspath(libdir)
    sys.path.insert(0, libdir)

# enable importing on demand to reduce startup time
try:
    from mercurial import demandimport; demandimport.enable()
except ImportError:
    import sys
    sys.stderr.write("abort: couldn't find mercurial libraries in [%s]\n" %
                     ' '.join(sys.path))
    sys.stderr.write("(check your install and PYTHONPATH)\n")
    sys.exit(-1)

from mercurial import (
    dispatch,
    util,
)

def timer(func, title=None):
    results = []
    begin = util.timer()
    count = 0
    while True:
        ostart = os.times()
        cstart = util.timer()
        r = func()
        cstop = util.timer()
        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))

orgruncommand = dispatch.runcommand

def runcommand(lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions):
    ui.pushbuffer()
    lui.pushbuffer()
    timer(lambda : orgruncommand(lui, repo, cmd, fullargs, ui,
                                 options, d, cmdpats, cmdoptions))
    ui.popbuffer()
    lui.popbuffer()

dispatch.runcommand = runcommand

dispatch.run()