Test of Rust in Python with ctypes

_README.md

Abstract

I did a test to read a SO with ctypes in Python, which is compiled with Rust. I wanted to write a function in both languages and measure their timing. These functions will calculate the b power of a. Pseudocode for algorithm is as below:

fn power(int a, int b) -> int {
    int c = a
    for b times {
        c = c*a;
    }
    return c;
}

Build Manual

rustc power.rs --crate-type dylib

Test Environment

• An old computer
• Python 3.5.2
• rustc 1.7.0

power.rs

#[no_mangle]
pub extern fn powerof(a: i32, b: i32) -> i32 {
    let mut c: i32 = a;
    for x in 0..b {
        c = c*a;
    }
    return c;
}

test.py

from ctypes import cdll
import time

_powerof = cdll.LoadLibrary("./libpower.so")

def timing(f):
    # http://stackoverflow.com/a/5478448
    def wrap(*args):
        time1 = time.time()
        ret = f(*args)
        time2 = time.time()
        print('{} function took {:0.4f} ms'.format(f.__name__, (time2-time1)*1000.0))
        return ret
    return wrap

@timing
def powerof(a, b):
	global _powerof
	result = _powerof.powerof(a, b)
	return int(result)

@timing
def powerof_python(a, b):
	c = a
	for i in range(b):
		c=c*a
	return c


if __name__ == "__main__":
	print(powerof(4,5))
	print(powerof(2,3))
	print(powerof(6,4))

	print(powerof_python(4,5))
	print(powerof_python(2,3))
	print(powerof_python(6,4))