Blog - Generators (Runtime Performance)

generator_runtime_performance.py

import cProfile

print("Generator Runtime Stats:")
cProfile.run('sum((i for i in range(100000)))')

print("List Runtime Stats:")
cProfile.run('sum([i for i in range(100000)])')

Generator Runtime Stats:
         100005 function calls in 0.123 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
   100001    0.015    0.000    0.015    0.000 <string>:1(<genexpr>)
        1    0.000    0.000    0.123    0.123 <string>:1(<module>)
        1    0.000    0.000    0.123    0.123 {built-in method builtins.exec}
        1    0.108    0.108    0.122    0.122 {built-in method builtins.sum}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}


List Runtime Stats:
         5 function calls in 0.012 seconds

   Ordered by: standard name

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.010    0.010    0.010    0.010 <string>:1(<listcomp>)
        1    0.001    0.001    0.012    0.012 <string>:1(<module>)
        1    0.000    0.000    0.012    0.012 {built-in method builtins.exec}
        1    0.001    0.001    0.001    0.001 {built-in method builtins.sum}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}