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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