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From: "Caldarale, Charles R" <Chuck.Caldarale@unisys.com>
To: Tomcat Users List <users@tomcat.apache.org>
Date: Wed, 12 Nov 2008 12:59:17 -0600
Subject: RE: Tomcat threads, II
Thread-Topic: Tomcat threads, II
Thread-Index: AclE60S2GdY0WT+aRiSlminnA/vEDgABv9rg
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> From: Andr=E9 Warnier [mailto:aw@ice-sa.com]
> Subject: Re: Tomcat threads, II
>
> I have turned it off now, and restarted Tomcat, but it
> did not have any noticeable impact on the startup time.

Wouldn't expect it to, since you're spending nearly all the time parsing th=
at XML file.

It may have an effect when you actually start processing requests, but the =
impact may be small.

> As far as I can tell, these settings come from the
> "catalina.sh" script.  I have no idea if this script
> is modified, compared to the Official version.

Yes, the Debians screwed it up, by trying to patch it to work with gcj (a f=
utile and pointless task).  The real script only adds the extra jars if you=
 specify an alternate secure sockets library with the JSSE_HOME environment=
 variable.

> it seems to have survived (apart from bootstrap.jar,
> which I had to leave)

Yes, bootrstrap.jar is the only thing that should be on the classpath.

> But that did not apparently reduce its startup time much.

If your startup were not completely dominated by the XML parsing, you shoul=
d see some difference.

> If anything, it seems now to occupy more memory than before :
> Is there an explanation for that ?

No, the exact amount probably varies considerably over time and really isn'=
t anything to worry about.

> I also don't seem to be able to run JConsole.

You'll need to attach remotely.  Assuming your target system is protected f=
rom potential threats by some external means, you can set jmxremote handlin=
g without authentication by adding these parameters for starting Tomcat:
  -Dcom.sun.management.jmxremote.port=3D<jmxport>
  -Dcom.sun.management.jmxremote.authenticate=3Dfalse
  -Dcom.sun.management.jmxremote.ssl=3Dfalse
(all on one line, of course).  Use CATALINA_OPTS or JAVA_OPTS to set them.

Then run JConsole from your desktop, and give it the IP address and JMX por=
t of the Tomcat machine in the Remote Process box.  Full reference is here:
http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jconsole.html
http://java.sun.com/j2se/1.5.0/docs/guide/management/agent.html

 - Chuck


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