python并行计算demo，用于求0~n之间的素数之和

想试试服务器的并行计算能力，就让cpu慢慢计算，计算0~n之间所有素数之和

设置target为结尾，num_of_processors为进程数，即可开始跑

如下所示

from multiprocessing import Pool
import math 
import numpy
import time 

def isPrime(n): 
    if n <= 1: 
        return False
    for i in range(2, int(math.sqrt(n)) + 1):
        if n % i == 0:
            return False
    return True

def f(data):
    start,end = data
    result = 0
    for n in range(start,end+1):
        if isPrime(n):
           result += n
    return result

def main():
    num_of_processors = 12
    target = 10000000
    data = numpy.linspace(0, target, num_of_processors+1).astype(int)
    start_time = time.time()
    pool = Pool(num_of_processors)
    result = pool.map(f, list(zip(data[:-1],data[1:])) )
    pool.close()
    pool.join()
    print("总耗时",time.time() - start_time)
    print(f"0~{target}的素数之和:",sum(result))
    
if __name__ == "__main__":
   main()

结果：