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From "Troy J. Kelley" <tkel...@e-gineering.com>
Subject RE: Tomcat 4.x and Java Processes
Date Tue, 07 Jan 2003 20:52:33 GMT
Thanks.  Nope, doesn't really bother me at all just trying to learn a
bit more is all.  The thing that got me thinking about this in the first
place is that on an older version of Tomcat (4.1.12?) the init.d script
for stopping tomcat supplied with the RPM wasn't killing off all of the
processes...   I'll move on now - thanks Ben.

-Troy



-----Original Message-----
From: Ben Ricker [mailto:bricker@wellinx.com] 
Sent: Tuesday, January 07, 2003 3:31 PM
To: 'Tomcat Users List'
Subject: RE: Tomcat 4.x and Java Processes

On Tue, 2003-01-07 at 14:21, Troy J. Kelley wrote:
> Yes, sorry, I forgot to mention that.  Are there options for threading
> on linux?  I think on Solaris, you can do "green" or native threads.
If
> so, would a change in this setting reduce the JVM to a single pid?
> 
> Thanks for the quick reply!
> 
> -Troy

Nope. An application like Tomcat, or the JVM for that matter, will
always be multi-threaded. Green or Native has to do with how exactly the
threads are created (I forgot the exact differences).

What is the big deal with seeing multiple Java processes? Are you
worried about RAM? Note that the threads all have the same memory
allocation. You do not add those up; the shared memory is just that:
shared amongst all of the threads.

I would just forget about it and move on. You will not get a single PID.
Well, I tale that back. Never say never when it comes to Unix; you might
be able to list the Parent PIDS only by messing with the 'ps' options. I
have never done that myself, so I suggest, if you feel the need, to look
through the man pages for 'ps'.

HTH,

Ben Ricker

> -----Original Message-----
> From: Ben Ricker [mailto:bricker@wellinx.com] 
> Sent: Tuesday, January 07, 2003 3:13 PM
> To: Tomcat Users List
> Subject: Re: Tomcat 4.x and Java Processes
> 
> Are you using Linux? Linux shows in-process threads as processes. If
you
> are running Linux, then you are seeing threads within the Java
process.
> You would expect to see a number of threads even with your simple
> config.
> 
> Ben Ricker
> 
> On Tue, 2003-01-07 at 14:07, Troy J. Kelley wrote:
> > I've been looking all over for the answer to this and can't seem to
> find
> > a good answer.
> > 
> > My basic question is that when I start up a *very* basic tomcat
config
> > (JMX Support, HTTP Listener, one engine, one host, once context) I
get
> > several java processes that look the same:
> > 
> > 
> > root      5865  0.0  5.7 227380 29548 ?      S    15:02   0:02
> > /usr/java/jdk/bin/java -Djava.endorsed.dirs= -classpath
> > /usr/java/jdk/lib/tools.jar:/var/tomcat4/bin/bootstrap.jar
> > -Dcatalina.base=/var/tomcat4 -Dcatalina.home=/var/tomcat4
> > -Djava.io.tmpdir=/var/tomcat4/temp
> org.apache.catalina.startup.Bootstrap
> > start
> > 
> > So, why are there so many processes?  I set minProcessors="1"
> > maxProcessors="1" for the Coyote HTTP connector to reduce the number
> of
> > JVMs related to this...
> > 
> > In the WebSphere world a JVM is synonymous with an "Application
> Server",
> > which services the requests for the modules (WAR/EAR) "installed"
into
> > the appserver.
> > 
> > Any insight would be greatly appreciated.
> > 
> > -Troy
> > tkelley@e-gineering.com
> > 
> > 
> > --
> > To unsubscribe, e-mail:
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-- 
Ben Ricker <bricker@wellinx.com>
Wellinx.com


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