Kedar Mhaswade's Blog

kill and kill -9

The Javadoc clearly instructs If the virtual machine aborts then no guarantee can be made about whether or not any shutdown hooks will be run.

I was just curious to test this out with GlassFish Application Server on my MacBookPro. When the GlassFish server VM either aborts or shuts down, I observe the following:

Comments

• Because when i type kill, i want to kill process. I don't want to ask it to die slowly and painfully. Only kill -9 actually kills.

  Posted by: sannysanoff on February 08, 2007 at 02:12 AM

• Sometimes you want to kill a java process that has run out of heap space (like our JBoss nodes do irritatingly often), and therefore doesn't have enough free memory to shutdown gracefully.

  Posted by: skaffman on February 08, 2007 at 08:19 AM

• I would highly recommend getting in the habit of doing a "kill -2" and only doing a "kill -9" if you absolutely need it.

  In scripts, you should:

  kill -2 $pid # initial attempt to kill
  sleep 5 # give it some time to die naturally
  kill -9 $pid # make sure it is dead - in case of heap problems. /li>

  
  If you are killing a container that has locks to clean up, etc. when it is killed, you have given it a chance to do so. If you always "kill -9" because you are impatient, you may be setting yourself up for a long test of patience when your setup is left in an inconsistent state.
  

  Posted by: kweinber on February 08, 2007 at 05:02 PM

• kweinber: Exactly. I agree with you, that "kill -9" is rather harsh, but I wonder why everyone seems to be used to it!

  Posted by: km on February 08, 2007 at 05:10 PM

• shutting down an ant started application in eclipse won't call the shutdown hook either... is there a way to know what signal is sent there?

  Posted by: francisdb on February 09, 2007 at 10:00 AM

• I'll play devil's advocate: crashes happen anyway. I would highly recommend software to react benignly to any uncontrolled restart. Don't rely on orderly shutdown. http://en.wikipedia.org/wiki/Crash-only_software
  

  Posted by: mernst on February 11, 2007 at 03:21 AM

• 'll play devil's advocate: crashes happen anyway. I would highly recommend software to react benignly to any uncontrolled restart. Don't rely on orderly shutdown. http://en.wikipedia.org/wiki/Crash-only_software

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  telechargement-sex
  telechargement-sexe
  telechargement-x
  telechargement-xxx
  telechargement
  telechargement2
  telecharger
  telecharger2
  telecharger-antivirus
  telecharger-chanson
  telecharger-chansons
  telecharger-divx
  <a href="http://home.tiscali.cz:8080/telecharger

  Posted by: maripikos on June 17, 2007 at 01:45 PM

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