This section is provided for users that ``don't want to read the manual.'' It provides a very brief overview, and allows a user to rapidly perform profiling on an existing application.
To profile an application with a main entry point of "foo()", you would add the following to your module:
import profile profile.run('foo()')
The above action would cause "foo()" to be run, and a series of informative lines (the profile) to be printed. The above approach is most useful when working with the interpreter. If you would like to save the results of a profile into a file for later examination, you can supply a file name as the second argument to the run() function:
import profile profile.run('foo()', 'fooprof')
The file profile.py can also be invoked as a script to profile another script. For example:
python /usr/local/lib/python1.5/profile.py myscript.py
When you wish to review the profile, you should use the methods in the pstats module. Typically you would load the statistics data as follows:
import pstats p = pstats.Stats('fooprof')
The class Stats (the above code just created an instance of this class) has a variety of methods for manipulating and printing the data that was just read into "p". When you ran profile.run() above, what was printed was the result of three method calls:
p.strip_dirs().sort_stats(-1).print_stats()
The first method removed the extraneous path from all the module names. The second method sorted all the entries according to the standard module/line/name string that is printed (this is to comply with the semantics of the old profiler). The third method printed out all the statistics. You might try the following sort calls:
p.sort_stats('name') p.print_stats()
The first call will actually sort the list by function name, and the second call will print out the statistics. The following are some interesting calls to experiment with:
p.sort_stats('cumulative').print_stats(10)
This sorts the profile by cumulative time in a function, and then only prints the ten most significant lines. If you want to understand what algorithms are taking time, the above line is what you would use.
If you were looking to see what functions were looping a lot, and taking a lot of time, you would do:
p.sort_stats('time').print_stats(10)
to sort according to time spent within each function, and then print the statistics for the top ten functions.
You might also try:
p.sort_stats('file').print_stats('__init__')
This will sort all the statistics by file name, and then print out statistics for only the class init methods ('cause they are spelled with "__init__" in them). As one final example, you could try:
p.sort_stats('time', 'cum').print_stats(.5, 'init')
This line sorts statistics with a primary key of time, and a secondary
key of cumulative time, and then prints out some of the statistics.
To be specific, the list is first culled down to 50% (re: ".5")
of its original size, then only lines containing init
are
maintained, and that sub-sub-list is printed.
If you wondered what functions called the above functions, you could now ("p" is still sorted according to the last criteria) do:
p.print_callers(.5, 'init')
and you would get a list of callers for each of the listed functions.
If you want more functionality, you're going to have to read the manual, or guess what the following functions do:
p.print_callees() p.add('fooprof')
Invoked as a script, the pstats module is a statistics browser for reading and examining profile dumps. It has a simple line-oriented interface (implemented using cmd) and interactive help.
See About this document... for information on suggesting changes.
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