If this happens on the front end
this sounds like a misconfiguration
try setting min and max heap params for your JVM e.g.
-Xms256m -Xmx512m -XX:MaxPermSize=512m -XX:+PrintGCDetails
XX:+UseConcMarkSweepGC -XX:+CMSPermGenSweepingEnabled
On the back end
use stack variables as they fall out of scope they are freed
be careful on allocations for anything which uses Collector
finally if you dont need the memory (and you can spare 1-2 sec delay) dont
be afraid to call Runtime.gc()
to recycle the discarded memory
http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html#gc()
Martin
----- Original Message -----
From: "Christian Andersson" <[EMAIL PROTECTED]>
To: "Tomcat Users List" <users@tomcat.apache.org>
Sent: Thursday, July 31, 2008 8:02 AM
Subject: Re: is it possible more than 1 tomcat in single system?
Peter Crowther skrev:
From: Edi [mailto:[EMAIL PROTECTED]
consider, i had 4 java application running in one tomcat, if
one application
crashes, all the other 3 application gets crashes. right?
Correct. But it's not always that simple :-).
It's your choice how you want to split up your applications between
different containers (Tomcats in this case) to trade off memory use vs
reliability. You might get a *less* reliable system by splitting up the
applications into separate Tomcat instances, though. Each Tomcat runs in
its own JVM, and each is allocated a maximum memory size. If you are not
careful when tuning the system, you might find that one application in
one Tomcat/JVM runs out of memory although there is plenty of spare
memory in the system. If you put them all into one Tomcat/JVM, the
applications all use the same (larger) memory pool.
And what happens if you get one "rough" application stealing all the
memory? probably all your applications will stop functioning..
For me it is always better to have 1 application crash, then >1
it is also easier to see which application is the guilty one if only that
application crashes..
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