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Timing Units
------------
This example demonstrates how you can change the units in which the time is
reported.
Write the following demo script to disk
.. code:: bash
echo "if 1:
from line_profiler import profile
@profile
def is_prime(n):
max_val = n ** 0.5
stop = int(max_val + 1)
for i in range(2, stop):
if n % i == 0:
return False
return True
def find_primes(size):
primes = []
for n in range(size):
flag = is_prime(n)
if flag:
primes.append(n)
return primes
def main():
print('start calculating')
primes = find_primes(10)
primes = find_primes(1000)
primes = find_primes(100000)
print(f'done calculating. Found {len(primes)} primes.')
if __name__ == '__main__':
main()
" > script.py
Run the script with line profiling on. To change the unit in which time is
reported use the ``--unit`` command line argument. The following example shows
4 variants:
.. code:: bash
LINE_PROFILE=1 python script.py
# Use different values for the unit report
python -m line_profiler -rtmz --unit 1 profile_output.lprof
python -m line_profiler -rtmz --unit 1e-3 profile_output.lprof
python -m line_profiler -rtmz --unit 1e-6 profile_output.lprof
python -m line_profiler -rtmz --unit 1e-9 profile_output.lprof
You will notice the relevant difference in the output lines:
.. code::
==============
unit 1 variant
==============
Timer unit: 1 s
...
6 101010 0.0 0.0 3.6 max_val = n ** 0.5
7 101010 0.1 0.0 4.0 stop = int(max_val + 1)
...
=================
unit 1e-3 variant
=================
Timer unit: 0.001 s
...
6 101010 46.6 0.0 3.6 max_val = n ** 0.5
7 101010 51.5 0.0 4.0 stop = int(max_val + 1)
...
=================
unit 1e-6 variant
=================
Timer unit: 1e-06 s
...
6 101010 46558.2 0.5 3.6 max_val = n ** 0.5
7 101010 51491.7 0.5 4.0 stop = int(max_val + 1)
...
=================
unit 1e-9 variant
=================
Timer unit: 1e-09 s
...
6 101010 46558246.0 460.9 3.6 max_val = n ** 0.5
7 101010 51491716.0 509.8 4.0 stop = int(max_val + 1)
...
|
