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 。
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#/usr/bin/python
# _*_ coding: utf-8 _*_
import multiprocessing
import time
import paramiko
def ssh(s,i,host):
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try:
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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
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t
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&& df - hl")
print (stdout.read().decode( 'utf-8' ))
returncode = stdout.channel.recv_exit_status()
print ( "returncode:" ,returncode)
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except:
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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" )
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finally:
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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()
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运行结果如下图:
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原文链接:https://www.tuicool.com/articles/M3iQVju