If your running 'embedded' tomcat, there's actually only one process
running. What you're seeing in top is an artifact of the Linux thread
model - each individual thread shows as a separate process. Really in
Linux the only difference between a process and a thread is all threads
in a process share all of their memory.
To see a clearer picture of what's going on, run `ps -axf | more`.
You'll probably see more like 25-30 java 'processes' listed (maybe even
more, depending on what Hypersonic does). Most of these processes will
show up as children of a common ancester, whose PID actually represents
the process. The other PIDs are thread id, actually.
-danch
Jim Archer wrote:
> Hi All...
>
> I have read the architecture notes on the jBoss site, but I'm still
> wondering a few things about what jBoss does when it is run. I'm using
> jBoss 2.2.1 bundled with Tomcat on a Debian/Linux SMP machine.
> Currently, I'm still running Hypersonic as bundled, so I guess there are
> three java processes: Tomcat, jBoss and Hypersonic.
>
> When jBoss is running, I always see at least one instance of it, but
> usually more. Right now, for example, top shows 7 instances of java
> running, each by user jboss and each with a different PID. I have seen
> it get much higher.
>
> The size and resident components (RSS) of each are the same at 121M.
>
> My question is, are each of these a seperate VM or different processes
> running within the same VM?
>
> Also, what causes the number of java processes to change? Does jBoss
> make more instances of itself as the load increases, or is it a matter
> of Tomcat needing a bean and making a jBoss instance to service a
> transaction?
>
> I would appreciate any insite into this!
>
> Thanks very much!
>
> Jim
>
>
> ********************************************
> I shall be telling this with a sigh
> Somewhere ages and ages hence:
> Two roads diverged in a wood, and I -
> I took the one less traveled by,
> And that has made all the difference.
>
> - Robert Frost, 1916
>
>
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