Development:Profiling
From OpenLP
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Profile Application Execution
Go to the directory where your code is, and run the following command:
python -m cProfile -o openlp.prof openlp.pyw
Your application should run normally, without any unusual errors.
Seeing Profiling Statistics
Command Line
Once you have run your application, you'll want to see the profiling statistics. Create a file called openlp_profile.py with the following code:
#!/usr/bin/env python
import pstats
p = pstats.Stats('openlp.prof')
p.sort_stats('cumulative').print_stats(20)
Running this should give you output similar to this:
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 1.092 1.092 openlp/plugins/bibles/lib/mediaitem.py:341(onBibleAddClick)
1 0.001 0.001 0.971 0.971 openlp/core/ui/servicemanager.py:188(addServiceItem)
1 0.000 0.000 0.969 0.969 openlp/core/lib/serviceitem.py:59(render)
203 0.036 0.000 0.946 0.005 openlp/core/lib/renderer.py:293(_render_and_wrap_single_line)
3753 0.165 0.000 0.893 0.000 openlp/core/lib/renderer.py:396(_get_extent_and_render)
25 0.794 0.032 0.794 0.032 {built-in method scaled}
5 0.000 0.000 0.614 0.123 openlp/core/lib/rendermanager.py:157(generate_slide)
5 0.000 0.000 0.606 0.121 openlp/core/lib/renderer.py:126(generate_frame_from_lines)
20 0.000 0.000 0.605 0.030 openlp/core/lib/renderer.py:266(_render_lines_unaligned)
1 0.000 0.000 0.523 0.523 openlp/core/ui/servicemanager.py:214(makeLive)
1 0.000 0.000 0.523 0.523 openlp/core/ui/slidecontroller.py:307(addServiceManagerItem)
5 0.000 0.000 0.520 0.104 openlp/core/ui/slidecontroller.py:67(addRow)
5 0.001 0.000 0.520 0.104 openlp/core/ui/slidecontroller.py:52(insertRow)
8 0.428 0.053 0.428 0.053 {built-in method setStandardButtons}
KCachegrind
You also can use KCachegrind if you like to have a GUI. This also for example enables you to see where a function call came from and other useful things. Install it with:
sudo apt-get install kcachegrind
You will need to install pyprof2calltree, which allows you to convert openlp.prof to something kcachegrind can manage:
sudo easy_install pyprof2calltree
To start kcachegrind simply execute:
pyprof2calltree -i openlp.prof -k
More Profiling Information
To see more or other profiling information, or to sort by other columns, see the Profilers page in the Python documentation, and in particular pstats.Stats.sort_stats.
