test --time

  $ hg --time help -q help 2>&1 | grep time > /dev/null

  $ hg init a

  $ cd a

test --profile

  $ hg st --profile 2>&1 | grep Sample

  Sample count: \d+ (re)

Abreviated version

  $ hg st --prof 2>&1 | grep Sample

  Sample count: \d+ (re)

In alias

  $ hg --config "alias.profst=status --profile" profst 2>&1 | grep Sample

  Sample count: \d+ (re)

#if lsprof

  $ prof='hg --config profiling.type=ls --profile'

  $ $prof st 2>../out

  $ grep CallCount ../out > /dev/null || cat ../out

  $ $prof --config profiling.output=../out st

  $ grep CallCount ../out > /dev/null || cat ../out

  $ $prof --config profiling.output=blackbox --config extensions.blackbox= st

  $ grep CallCount .hg/blackbox.log > /dev/null || cat .hg/blackbox.log

  $ $prof --config profiling.format=text st 2>../out

  $ grep CallCount ../out > /dev/null || cat ../out

  $ echo "[profiling]" >> $HGRCPATH

  $ echo "format=kcachegrind" >> $HGRCPATH

  $ $prof st 2>../out

  $ grep 'events: Ticks' ../out > /dev/null || cat ../out

  $ $prof --config profiling.output=../out st

  $ grep 'events: Ticks' ../out > /dev/null || cat ../out

#endif

#if lsprof serve

Profiling of HTTP requests works

  $ $prof --config profiling.format=text --config profiling.output=../profile.log serve -d -p $HGPORT --pid-file ../hg.pid -A ../access.log

  $ cat ../hg.pid >> $DAEMON_PIDS

  $ hg -q clone -U http://localhost:$HGPORT ../clone

A single profile is logged because file logging doesn't append

  $ grep CallCount ../profile.log | wc -l

  \s*1 (re)

#endif

Install an extension that can sleep and guarantee a profiler has time to run

  $ cat >> sleepext.py << EOF

  > import time

  > from mercurial import registrar, commands

  > cmdtable = {}

  > command = registrar.command(cmdtable)

  > def sleep(ui, *args, **kwargs):

  >     time.sleep(0.1)

  > EOF

  $ cat >> $HGRCPATH << EOF

  > [extensions]

  > sleep = `pwd`/sleepext.py

  > EOF

statistical profiler works

  $ hg --profile sleep 2>../out

  $ grep Sample ../out

  Sample count: \d+ (re)

Various statprof formatters work

  $ hg --profile --config profiling.statformat=byline sleep 2>../out

  $ head -n 1 ../out

    %   cumulative      self          

  $ grep Sample ../out

  Sample count: \d+ (re)

  $ hg --profile --config profiling.statformat=bymethod sleep 2>../out

  $ head -n 1 ../out

    %   cumulative      self          

  $ grep Sample ../out

  Sample count: \d+ (re)

  $ hg --profile --config profiling.statformat=hotpath sleep 2>../out

  $ grep Sample ../out

  Sample count: \d+ (re)

  $ hg --profile --config profiling.statformat=json sleep 2>../out

  $ cat ../out

  \[\[-?\d+.* (re)

statprof can be used as a standalone module

  $ $PYTHON -m mercurial.statprof hotpath

  must specify --file to load

  [1]

  $ cd ..

profiler extension could be loaded before other extensions

  $ cat > fooprof.py <<EOF

  > from __future__ import absolute_import

  > import contextlib

  > @contextlib.contextmanager

  > def profile(ui, fp):

  >     print('fooprof: start profile')

  >     yield

  >     print('fooprof: end profile')

  > def extsetup(ui):

  >     ui.write('fooprof: loaded\n')

  > EOF

  $ cat > otherextension.py <<EOF

  > from __future__ import absolute_import

  > def extsetup(ui):

  >     ui.write('otherextension: loaded\n')

  > EOF

  $ hg init b

  $ cd b

  $ cat >> .hg/hgrc <<EOF

  > [extensions]

  > other = $TESTTMP/otherextension.py

  > fooprof = $TESTTMP/fooprof.py

  > EOF

  $ hg root

  otherextension: loaded

  fooprof: loaded

  $TESTTMP/b (glob)

  $ HGPROF=fooprof hg root --profile

  fooprof: loaded

  fooprof: start profile

  otherextension: loaded

  $TESTTMP/b (glob)

  fooprof: end profile

  $ HGPROF=other hg root --profile 2>&1 | head -n 2

  otherextension: loaded

  unrecognized profiler 'other' - ignored

  $ HGPROF=unknown hg root --profile 2>&1 | head -n 1

  unrecognized profiler 'unknown' - ignored

  $ cd ..