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From Арсений Зинченко <setev...@gmail.com>
Subject Re: JAVA_OPTS vs CATALINA_OPTS
Date Mon, 27 Jan 2014 15:58:51 GMT
Thanks, Christopher.

OK, what about next:

Set JAVA_OPTS as system variable (for all other applications); and create
setenv.bat in /bin/ directory with CATALINA_OPTS whith Xmx/Xms for Tomcat?

Will it be more correctly than set CATALINA_OPTS as System variable? Or -
by the way, in setevn.bat must be used JAVA_OPTS too?
<https://plus.google.com/u/0/113253806461878935497?prsrc=4>


2014/1/27 Christopher Schultz <chris@christopherschultz.net>

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> Арсений,
>
> On 1/27/14, 9:21 AM, Арсений Зинченко wrote:
> > We have a little dispute with my colleague about using this
> > variables.
> >
> > So: have Windows-box machine. On it - runing few different
> > Java-application, including Tomcat.
> >
> > Needs to set memory for Tomcat other, than for all other
> > Java-applications.
> >
> > My proposal is set to System variables:
> >
> > JAVA_OPTS "-Xmx1024M -Xms512M -XX:MaxPermSize512M" CATALINA_OPTS
> > "-Xmx4096M -Xms2048M -XX:MaxPermSize=1024M"
> >
> > But, as he asserts - this is not correct way:
> >
> >
> > - CATALINA_OPTS must NOT contain memory limits like "Xmx", "Xms"
> > etc; - Java Garbage collector will work differently because
> > JAVA_OPTS have another opts for memory then CATALINA_OPTS, so -
> > this will worse Tomcat performance; - and so on
>
> Tomcat runs Java roughly in this way:
>
> $JAVA_HOME/bin/java $JAVA_OPTS $CATALINA_OPTS  \
>          org.apache.catalina.startup.Bootstrap
>
> If you have these options configured using both environment variables,
> then CATALINA_OPTS (the later one) will win because that's how the JVM
> parses arguments: the last one on the command-line wins. So, it's
> perfectly safe to do what you have described above.
>
> On the other hand, note that since JAVA_OPTS specifies 0.5GiB of heap
> space for when you are /not/ launching Tomcat, then running
> "bin\shutdown.bat" will pre-allocate 0.5GiB of heap space just to send
> the "shutdown" command to a running Tomcat instance, and then
> terminate. It's kind of a waste.
>
> I totally agree with Dan's comments about how using "system
> variables": just use bin/setenv.bat and keep everything locally.
>
> > His suggestion is to set JAVA_OPTS with memory limits exactly to
> > Tomcat startup script (not as system variable at all).
>
> +1
>
> > So, my question is: is it correct to set memory limits for Tomcat
> > via CATALINA_OPTS variable? If in system also present JAVA_OPTS -
> > will it have influence on to Tomcat's perfarmance?
>
> See above.
>
> - -chris
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