title: How to kill multiple tornado processes at one time?
body: <p>I used <code>nohup python *.py &amp;</code> to run my tornado web service, and 8 processes started. </p>
  
  <p><img src="https://i.stack.imgur.com/6gRy2.png" alt="">.</p>
  
  <p>However, it is really annoying killing my tornado processes. I have to ues <code>kill -3 pid</code> 8 times to finally turn down my service. So I want to know how can I kill the 8 processes at one time in my bash? Thanks.</p>
  
  <p>I tried <code>killall python</code>, but it is dangerous when there is other python process running.</p>
  
  <p>@Viktor suggest me to use <code>pkill -P &lt;parent&gt;</code> and it works in my Ubuntu. But in Centos, 'pkill' doesn't work. So how can I 'pkill' the processes in Centos? Thanks.</p>