test: try to unflaky test-profile.t

That test rely on timing measurement, because it is about timing measurement. We
try to filter out the most common source of flakyness (slow disk stating)

tests/test-profile.t

@@ -1,167 +1,167 b''
 test --time
 
   $ hg --time help -q help 2>&1 | grep time > /dev/null
   $ hg init a
   $ cd a
 
 Function to check that statprof ran
   $ statprofran () {
   >   egrep 'Sample count:|No samples recorded' > /dev/null
   > }
 
 test --profile
 
   $ hg st --profile 2>&1 | statprofran
 
 Abreviated version
 
   $ hg st --prof 2>&1 | statprofran
 
 In alias
 
   $ hg --config "alias.profst=status --profile" profst 2>&1 | statprofran
 
 #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
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > @command(b'sleep', [], b'hg sleep')
   > 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
   $ cat ../out | statprofran
 
 Various statprof formatters work
 
   $ hg --profile --config profiling.statformat=byline sleep 2>../out || cat ../out
-  $ head -n 3 ../out
+  $ grep -v _path_stat ../out | head -n 3
     %   cumulative      self          
    time    seconds   seconds  name    
   * sleepext.py:*:sleep (glob)
   $ cat ../out | statprofran
 
   $ hg --profile --config profiling.statformat=bymethod sleep 2>../out || cat ../out
   $ head -n 1 ../out
     %   cumulative      self          
   $ cat ../out | statprofran
 
   $ hg --profile --config profiling.statformat=hotpath sleep 2>../out || cat ../out
   $ cat ../out | statprofran
 
   $ hg --profile --config profiling.statformat=json sleep 2>../out || cat ../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 ..
 
 #if no-chg
 profiler extension could be loaded before other extensions
 
   $ cat > fooprof.py <<EOF
   > from __future__ import absolute_import
   > import contextlib
   > import sys
   > @contextlib.contextmanager
   > def profile(ui, fp):
   >     print('fooprof: start profile')
   >     sys.stdout.flush()
   >     yield
   >     print('fooprof: end profile')
   >     sys.stdout.flush()
   > def extsetup(ui):
   >     ui.write(b'fooprof: loaded\n')
   > EOF
 
   $ cat > otherextension.py <<EOF
   > from __future__ import absolute_import
   > def extsetup(ui):
   >     ui.write(b'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
   $ HGPROF=fooprof hg root --profile
   fooprof: loaded
   fooprof: start profile
   otherextension: loaded
   $TESTTMP/b
   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 ..
 #endif