进程池

from multiprocessing import Pool,Process
import time
def func(n):
    for i in range(10):
        print(n+1)


if __name__ == ‘__main__‘:
    st1 = time.time()
    pool = Pool(5)
    pool.map(func,range(100))
    t1 = time.time() - st1

    st2= time.time()
    p_lst = []
    for i in range(100):
        p = Process(target=func,args=(i,))
        p_lst.append(p)
        p.start()
    for p in p_lst: p.join()
    t2 = time.time() - st2
    print(t1,t2)

import time,os
from multiprocessing import Pool

def func(n):
    print(‘start func%s‘%n,os.getpid())
    time.sleep(1)
    print(‘end func%s‘%n,os.getpid())

if __name__ == ‘__main__‘:
    p = Pool(5)
    for i in range(20):
        p.apply_async(func,args=(i,))
    p.close()
    p.join()

import socket
from multiprocessing import Pool

def func(conn):
    conn.send(b‘hello‘)
    print(conn.recv(1024).decode(‘utf-8‘))
    conn.close()


if __name__ ==‘__main__‘:
    sk = socket.socket()
    sk.bind((‘127.0.0.1‘,8080))
    sk.listen()
    p = Pool(5)
    while True:
        conn,addr = sk.accept()
        p.apply_async(func,args=(conn,))

    sk.close()

import socket

sk = socket.socket()
sk.connect((‘127.0.0.1‘,8080))
msg = sk.recv(1024).decode(‘utf-8‘)
print(msg)
msg2 = input(‘>>>‘).encode(‘utf-8‘)
sk.send(msg2)

sk.close()

from multiprocessing import Pool
import time
def func(i):
    time.sleep(0.5)
    return i*i

if __name__ == ‘__main__‘:
    pool = Pool(5)
    res_l = []
    for i in range(10):
        res = pool.apply_async(func,args=(i,))
        res_l.append(res)
    for res in res_l:print(res.get())

from multiprocessing import Pool
import time
def func(i):
    time.sleep(0.5)
    return i*i

if __name__ == ‘__main__‘:
    pool = Pool(5)
    ret = pool.map(func,range(10))
    print(ret)