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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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