Re: [JBoss-user] jBoss architecture question

[danch <da...@nv...>]

Jim Archer wrote:

> Hello..
> 
> --On Friday, May 11, 2001 8:25 AM +0100 "Kimpton,C (Chris)" 
> <Kim...@ra...> wrote:
> 
>>> So if each java process I see is a thread within the same VM,
>>> does anyone
>>> know what causes a new thread to be started?
>>> 
>> 
>> new Thread();
>> 
>> ;-)
> 
> 
> Yeah, OK...
> 
> 
>> I presume you have a performance problem and your trying to track down
>> where things are slow?  In which case look at optimisation tools....
> 
> 
> Not necesserally a performance problem. We have been load testing for 
> the purpose of seeing what might fall over and I was just trying to get 
> an understanding of what the app server is doing, how much RAM is being 
> used, and so on. Ultimately, we hope to be running our app on a 
> Debian/Linux box with Jetty, jBoss and PostgreSQL.
> 
> All the threads also raise a shutdown question. We have written an 
> init.d script to gracefully start and stop jBoss as a server task, in 
> the same manner as other Debian processes. If the script issues a kill 
> to each thread, will this produce a gracefull shutdown, or will it 
> terminate each thread ungracefully?
> 

The kill should be sent to the parent of all the threads. If you look at 
ps -axf output you'll see that run.sh spawns one process, which is then 
the parent for all the threads. A change in run.sh to save the pid of 
the java process into a file in var would be the best way to accomplish 
this.

-danch