repoview: separate concerns in _filteredrepotypes comment
The cited issue in Python bugtracker is closed, but hasn't been
fixed. We've been able to use the attached example and reproduce
it with Python 3.9.
The point where it turns from needless stress on the GC to
the an actual leak is when one factors in the fact that the GC
was before Python 3.4 unable to collect some types (see PEP 442).
Note that even with Python 2.7, the simple example of cycles
due to __mro__ are collectable. This was seen again with the
example attached on the CPython issue.
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_with_a_long_filename.py << EOF
> import time
> from mercurial import registrar
> cmdtable = {}
> command = registrar.command(cmdtable)
> @command(b'sleep', [], b'hg sleep')
> def sleep_for_at_least_one_stat_cycle(ui, *args, **kwargs):
> time.sleep(0.1)
> EOF
$ cat >> $HGRCPATH << EOF
> [extensions]
> sleep = `pwd`/sleepext_with_a_long_filename.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
$ grep -v _path_stat ../out | head -n 3
% cumulative self
time seconds seconds name
* sleepext_with_a_long_filename.py:*:sleep_for_at_least_one_stat_cycle (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
$ grep sleepext_with_a_long_filename.py ../out
.* [0-9.]+% [0-9.]+s sleepext_with_a_long_filename.py:\s*sleep_for_at_least_one_stat_cycle, line 7: time\.sleep.* (re)
$ 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