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Useful Development Tools
========================
Memory Profiling
----------------
GObject Instance Count Leak Check
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Requires a development (only available in debug mode) version of glib. Jhbuild
recommended.
::
jhbuild shell
GOBJECT_DEBUG=instance-count GTK_DEBUG=interactive ./quodlibet.py
* In the GTK+ Inspector switch to the "Statistics" tab
* Sort by "Cumulative" and press the "Next" multimedia key to quickly switch
songs.
* If something in the "Cumulative" column steadily increases we have a leak.
Performance Profiling
---------------------
cProfile
^^^^^^^^
* https://docs.python.org/2/library/profile.html
* bundled with python
::
python -m cProfile -s [sort_order] quodlibet.py > cprof.txt
where ``sort_order`` can one of the following:
calls, cumulative, file, line, module, name, nfl, pcalls, stdname, time
Example output::
885311 function calls (866204 primitive calls) in 12.110 seconds
Ordered by: cumulative time
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.002 0.002 12.112 12.112 quodlibet.py:11(<module>)
1 0.007 0.007 12.026 12.026 quodlibet.py:25(main)
19392/13067 0.151 0.000 4.342 0.000 __init__.py:639(__get__)
1 0.003 0.003 4.232 4.232 quodlibetwindow.py:121(__init__)
1 0.000 0.000 4.029 4.029 quodlibetwindow.py:549(select_browser)
1 0.002 0.002 4.022 4.022 albums.py:346(__init__)
...
...
SnakeViz
^^^^^^^^
* https://jiffyclub.github.io/snakeviz/
* ``pip install snakeviz``
::
python -m cProfile -o prof.out quodlibet.py
snakeviz prof.out
Run Snake
^^^^^^^^^
* http://www.vrplumber.com/programming/runsnakerun/
* package runsnakerun in debian Wheezy
::
python -m cProfile -o prof.out quodlibet.py
runsnake prof.out
Example: https://www.google.at/search?q=runsnakerun&tbm=isch
Gprof2Dot
^^^^^^^^^
* https://github.com/jrfonseca/gprof2dot
::
python -m cProfile -o output.pstats ./quodlibet.py
gprof2dot.py -f pstats output.pstats | dot -Tpng -o output.png
Line Profiler
^^^^^^^^^^^^^
* https://github.com/rkern/line_profiler
::
# wrap all functions of interest with the @profile decorator
./kernprof.py -l ./quodlibet.py # creates quodlibet.py.lprof
python line_profiler.py quodlibet.py.lprof > prof.txt
Example output::
Timer unit: 1e-06 s
File: test.py
Function: a at line 2
Total time: 0.001528 s
Line # Hits Time Per Hit % Time Line Contents
==============================================================
2 @profile
3 def a():
4 1 134 134.0 8.8 print "hello"
5 1 12 12.0 0.8 b = []
6 101 628 6.2 41.1 for i in xrange(100):
7 100 696 7.0 45.5 b.append(i)
8 1 58 58.0 3.8 print "world"
strace
^^^^^^
* https://linux.die.net/man/1/strace
::
strace -c ./quodlibet.py
Example output::
time seconds usecs/call calls errors syscall
------ ----------- ----------- --------- --------- ----------------
81.64 0.013274 9 1444 178 read
7.04 0.001144 0 4041 3259 open
3.81 0.000619 11 54 getdents64
2.80 0.000456 0 1004 fstat64
1.84 0.000299 0 2221 1688 stat64
...
...
IOProfiler
^^^^^^^^^^
* https://code.google.com/archive/p/ioapps/wikis/ioprofiler.wiki
* strace GUI
* Shows read/write to files (how many reads/writes per file, which parts of the files were affected)
::
strace -q -a1 -s0 -f -tttT -oOUT_FILE -e trace=file,desc,process,socket ./quodlibet.py
ioreplay -c -f OUT_FILE -o OUT_FILE.bin
ioprofiler.py
# open OUT_FILE.bin
Example: https://code.google.com/archive/p/ioapps/wikis/IOProfilerScreenshots.wiki
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