Time a function: Difference between revisions

<cpp>#include <ctime>

#include <iostream>

using namespace std;

int identity(int x) { return x; }

int sum(int num) {

for (int i = 0; i < 1000000; i++)

num += i;

return num;

}

double time_it(int (*action)(int), int arg) {

clock_t start_time = clock();

action(arg);

clock_t finis_time = clock();

return ((double) (finis_time - start_time)) / CLOCKS_PER_SEC;

}

int main() {

cout << "Identity(4) takes " << time_it(identity, 4) << " seconds." << endl;

cout << "Sum(4) takes " << time_it(sum, 4) << " seconds." << endl;

return 0;

<python>import sys, timeit

def usec(function, arguments):

modname, funcname = __name__, function.__name__

timer = timeit.Timer(stmt='%(funcname)s(*args)' % vars(),

setup='from %(modname)s import %(funcname)s; args=%(arguments)r' % vars())

try:

t, N = 0, 1

while t < 0.2:

t = min(timer.repeat(repeat=3, number=N))

N *= 10

microseconds = round(10000000 * t / N, 1) # per loop

return microseconds

except:

timer.print_exc(file=sys.stderr)

raise

def identity(x): return x</python>