> From: Morten Matras [mailto:[EMAIL PROTECTED]
> How would you set an environment up for the following case:
>
> - 20 independent (non related) webapplications with low traffic < 200
> unique (real) visitors per day per webapplication
> - Application architecture: Hibernate, >Java 1.5 and Stripes
> under the hood.
Hibernate and Stripes aren't small. This may be a part of your problem.
> I've set the system up with 1 tomcat per webapplication, but
> this uses a lot
> of memory, so I'm considering changing that to have 1-3
> Tomcat's, but need
> som verification on the road to choose:
>
> - Tomcat 5.5 vs Tomcat 6.0?
Whatever you're comfortable with. The server overheads are broadly similar for
each. If you're starting from scratch, I'd pick the later version - you'll pay
the learning curve either way, and 6.0 is not noticeably buggier than 5.5!
> - What memory settings must I set? MaxPermSize, Xms, Xmx? to
> ensure a low
> memory usage while still making sure that the server
> continues to run even during peak periods.
That's down to your apps, not Tomcat. Profile your apps to find out why
they're taking Java heap space. Something to think about, for example: 20
webapps each with Hibernate = 20 copies of Hibernate loaded.
Depending on your cost of RAM versus cost of admin time, you *might* want to
move the framework jars out of the webapps into a suitable common classloader
area (see the classloader HOWTO in the Tomcat docs for more information). This
will somewhat reduce your memory footprint, but give you an administrative
headache when you want to deploy a webapp with version of the framework that
isn't the same as the common version.
If you're only deploying these on one machine, adding RAM to the box is almost
certainly cheaper than the cost of your time researching the problem, plus
later admin time dealing with the headaches. It's also more reliable. If
you're creating a shrink-wrapped product, or deploying on many machines, the
economics may well be different.
- Peter
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