Cython factorial bench

Fact.java

public class Fact {
    static private int factorial(int n) {
        int ret = 1;
        for (int j = n; j > 0; j -= 1) {
            ret *= j;
        }
        return ret;
    }

    static private void bench() {
        for (int i = 0; i < 1000; i += 1) {
            factorial(5000);
        }
    }

    static public void main(String[] args) {
        long start = System.currentTimeMillis();
        bench();
        long stop = System.currentTimeMillis();

        System.out.print("Time consumed: ");
        System.out.print(stop - start);
        System.out.println("ms");
    }
}

factorial.pyx

def fact_cy(int n):
    cdef int i, ret
    ret = 1
    for i in range(n):
        ret *= n
    return ret

def bench_cy():
    for i in range(1000):
        fact_cy(5000)


def fact_py(n):
    ret = 1
    for _ in range(n):
        ret *= n
    return ret

def bench_py():
    for _ in range(1000):
        fact_py(5000)

main.py

import pyximport
pyximport.install()

import time
import factorial


cy_start = time.time()
factorial.bench_cy()
cy_end = time.time()

print "Cython: %sms" % ((cy_end - cy_start) * 1000)


py_start = time.time()
factorial.bench_py()
py_end = time.time()

print "Python: %sms" % ((py_end - py_start) * 1000)


print "Speed-up: %s" % ((py_end - py_start) / (cy_end - cy_start))