Isnt the adaptive sizing only relevant to much larger memory
configurations (Im running this JVM with a max heap of 1-1.5Gb?
Pete
"Angus Mezick" <[EMAIL PROTECTED]>
04/08/2003 17:51
Please respond to "Tomcat Users List"
To: "Tomcat Users List" <[EMAIL PROTECTED]>
cc:
Subject: RE: JVM tuning
Wouldn't AdaptiveSizePolicy help? (saves you the work of Java Heap usage
analyzing :-) :
I use this on my 2x proc machine.
-XX:UseParallelGC -XX:+UseAdaptiveSizePolicy
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]
> Sent: Monday, August 04, 2003 9:55 AM
> To: Tomcat Users List
> Subject: RE: JVM tuning
>
>
> Ah sorry I should really have said that I was focusing
> specifically on
> memory managment; general performance tuning is a completely
> different
> matter in which I do agree with you! On the memory front
> however I would
> stand by the fact that most tomcat webapps (big or small)
> would benefit
> from a change in the default JVM config.
>
> Anyway, have sorted out my problem now (by doing just that as
> well as a GC
> change) and performance is 10x better!
>
> cheers
> Pete
>
>
>
>
>
> "Shapira, Yoav" <[EMAIL PROTECTED]>
> 04/08/2003 14:45
> Please respond to "Tomcat Users List"
>
> To: "Tomcat Users List" <[EMAIL PROTECTED]>
> cc:
> Subject: RE: JVM tuning
>
>
>
> Howdy,
>
> >Well not really; we know that we are running Tomcat, a web container
> which
> >has its own (fixed) characteristics. It is a server side
> app which is
> >processing non state based transactions which are thus highly like to
> >involve a lot of objects being created and destroyed without too many
> >hanging around for long; the details of the webapp, unless it is
> highly
> >unusual, are likely not to matter particularly. This is a rule of
> thumb
> >not an exact science and the vast majority of people who run Tomcat
> would
> >benefit from running in such a configuration (or playing
> with it to see
> >what the effects were)
>
> I disagree ;)
>
> Every time I've tuned a webapp for pay, both transactional
> and not, both
> full J2EE and "just" servlets/JSPs, the above has been false. The
> webapp's specific implementation matters far more (typically
> 3-4 orders
> of magnitude) than the container implementation, especially
> for a mature
> container which has been tuned repetitively and carefully over time.
> It's precisely because of this, and because as you say performance
> tuning is not a science, that a rule of thumb is as likely to
> hurt as it
> is to help if blindly applied.
>
> > read Sun's own tuning documentation and you will
> >see the default settings are not said to be suitable for the majority
> of
> >server apps.
>
> I appreciate the pointer - I used to help write them ;)
>
> Good luck, however, as it's always YMMV with these things.
>
> Yoav Shapira
>
>
>
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