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 > > > > This e-mail, including any attachments, is a confidential business > communication, and may contain information that is confidential, > proprietary and/or privileged. This e-mail is intended only for the > individual(s) to whom it is addressed, and may not be saved, copied, > printed, disclosed or used by anyone else. If you are not the(an) > intended recipient, please immediately delete this e-mail from your > computer system and notify the sender. Thank you. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
