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From "Joseph Morgan" <joseph.mor...@ignitesales.com>
Subject RE: Tomcat Memory and Garbage Collection questions...
Date Mon, 02 Nov 2009 21:44:36 GMT
I hope Mr. Caldarale answered your question, because you may otherwise
be looking at the 800lb Gorilla in the room.

Memory problems within Tomcat could be a number of very hard to see
things, but some quick candidates are:

* Programmers caching too much data from the DB (or file system) into
context attributes
* Programmers using context attributes to store session data
* Programmers pushing too much data into session attributes
* Session timeout is set too high and sessions aren't timing out

-----Original Message-----
From: Johnson, Trevin (Contractor) [mailto:Trevin.Johnson@occ.treas.gov]

Sent: Monday, November 02, 2009 2:53 PM
To: 'users@tomcat.apache.org'
Subject: Tomcat Memory and Garbage Collection questions...

Hello
OS Version: Windows 2000
Tomcat version:5.5.17
Initial Memory Pool: 768
Maximum Memory Pool:1024
Java Version: Java\jdk1.5.0_14

When we restart the tomcat service our tomcat memory is about 120Mb. It
keeps going up over the next few days util it reaches 700Mb and we have
to reboot the server. We do not see any errors just yet but the server
gets close to maxing out
I have questions around garbage collection for tomcat

Questions:
1.We do not see the memory going down for the tomcat service. Shouldn't
the memory go down as well as up over this timespan
2.Should the memory get to maximum 768Mb and then go back down or get
recycled?
3.Is this a bug or what is normal behavior for the tomcat memory?

4.. How do we implement garbage collection for our windows
server(-Xincgc)?

I am very new to Tomcat and trying to manage/decrease the memory
footprint used by Tomcat?
Your help is most appreciated...

Thanks
Trevin.johnson@occ.treas.gov


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