Profiling python functions by line_profiler

We can easily profile functions in Python using line_profiler package. This package profiling functions simply using decorator around these functions.

First Install package:

pip install line_profiler

And add decorator @profile around function

@profile                                                                                                                                        
def fact(n):
    if n == 0: return 1
    elif n == 1: return 1

Then use profiler. First create dump file for out test.py

kernprof --line-by-line test.py

This command will create file test.py.lprof

Now run profiler

python -m line_profiler test.py.lprof

Output

Timer unit: 1e-06 s
Total time: 1e-05 s
File: test.py
Function: fact at line 1
Line #      Hits         Time  Per Hit   % Time  Line Contents
==============================================================
     1                                           @profile
     2                                           def fact(n):
     3         3          3.0      1.0     30.0      if n == 0: return 1
     4         3          2.0      0.7     20.0      elif n == 1: return 1
     5         2          5.0      2.5     50.0      else: return n * fact(n-1)

This prints statistics for executing every line in the function call.

That’s it.