使用python调用c语言实现100000000次加法运算速度对比

Posted 2021-03-18 FANDX

c语言代码

vim numadd.c

#include <stdio.h>

int num_test(){
int sum = 0;
for (int i=0; i<100000000; i++){
    sum += i;
}
return sum;
}

# 生成.so动态链接文件
clang --shared -o libnumadd.so numadd.c

python代码

import time
from ctypes import CDLL

def python_sum():
    sum = 0
    for i in range(100000000):
        sum += i
    print(sum)

if __name__ == "__main__":
    start_time = time.time()
    python_sum()
    end_time = time.time()
    print(end_time-start_time)
    start_time = time.time()
    lib = CDLL("./libnumadd.so")
    lib.num_test()
    end_time = time.time()
    print(end_time-start_time)

# 执行结果
4999999950000000
5.95462203026
0.235713005066
# 足足快了25倍的速度

实验证明合理使用c语言+Python可以最大效率的实现优化代码