Re: java GC options for tomcat6 service

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 14 Apr 2011 18:41:44 -0400

Message-ID:

<io7t6q$or3$1@news.albasani.net>

On 04/14/2011 04:53 PM, Gerard H. Pille wrote:

I'd like to pass some java [sic] GC options when starting a tomcat6 [sic] service
on a windows [sic] server, eg. [sic] -Xloggc -XX:+UnlockExperimentalVMOptions -XX:
+UseG1GC

Tomcat (or the jvm [sic]) seems to disregard my options, or has trouble with
them, like "-XX:+PrintGCTimeStamps" would fail with "unknown option
+PrintGCTimeStamps". The GC-log is never created.

If it's an unknown option, that means that that version of the JVM doesn't
support that option. You might have to research available options for the JVM
that Tomcat's using.

I'm entering these options in the gui [sic]:

tomcat6w //ES//tomcat6

I know my options are correct, when I start a TestGCThread with them,
they have the desired effect.

Any idea what I could be doing wrong?

Do you have more than one version of Java on the system that's running Tomcat?
If so, which version is Tomcat using?

References to help answer these questions and yours:
<http://tomcat.apache.org/tomcat-6.0-doc/setup.html>
<http://tomcat.apache.org/tomcat-6.0-doc/windows-service-howto.html>

It looks like you need options "--JavaHome" or "--Jvm" as well as "--JvmOptions".

--
Lew
Honi soit qui mal y pense.
http://upload.wikimedia.org/wikipedia/commons/c/cf/Friz.jpg