目录

通过Semaphore 来控制对共享资源的的访问数量，可以控制同一时刻并发的进程数 。

#/usr/bin/python

# _*_ coding: utf-8 _*_

import multiprocessing

import time

import paramiko

def ssh(s,i,host):

try:

s.acquire()

print(time.strftime('%H:%M:%S'),multiprocessing.current_process().name + " 获得锁运行");

ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

ssh.connect(hostname=host, port=22, username="root", password="yankefei")

print (host+" is login success")

stdin, stdout, stderr = ssh.exec_command("echo 
d
a
t
e
 && df -hl")

print(stdout.read().decode('utf-8'))

returncode = stdout.channel.recv_exit_status()

print("returncode:",returncode)

except:

ssh.close()

# time.sleep(i)

print(time.strftime('%H:%M:%S'),multiprocessing.current_process().name + " 释放锁结束");

s.release()

print (host+" is unreachable")

finally:

ssh.close()

s.release()

if __name__ == "__main__":

s = multiprocessing.Semaphore(200) #同时并发200个进程

for n in range(111):

p = multiprocessing.Process(target = ssh, args=(s,2,"192.168.0."+str(n)))

p.start()

运行结果如下图：