It depends on how you create the request. If every request creates a new session and
you are not explicitly killing the sessions and the session time-out is set to 15
minutes then memory will disappear. We had affliates using robots to retrieve up to
date availability and rate information. Each request created a new session (note our
servlet server was not Tomcat but my tests seem to suggest Tomcat behaves the same).
I explicitly killed the session after outputting the response and problem solved.
With lower transaction volumes GC does eventually kick in. In servlet servers you
can configure the web app to do various things the problem is the application "knows"
whether the requester is a registered customer or a robot. Tomcat (I may be wrong
here) can't be clever enough as this is part of the application logic. Nobody likes
putting operational code in application code I could see how Tomcat you track and then
use a more intelligent GC algorithm but this would add an overhead and could
potentially drop sessions which needs to be retained. My feeling is encoding in the
application is the only way at this point.
Comments or thoughts?
I use Apache2 connecting through JK2 to Tomcat4. I am not using JBoss.
Mike
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
Sent: Fri 31/01/2003 05:44
To: [EMAIL PROTECTED]
Cc:
Subject: 100% CPU Usage
Hi
We have a application that send request to the server approximtely
every 1 second. Considering that 2 connectios are made to the server and 1
request ever 1 second from 2 users its around 2 request every second work
well for couple of hours. But it seems the GC is never called. After couple
of hours the server usage 100% CU. This works well for some more time and
then the srever gets dead slow. What can be the reason and how can we stop
100% memory usage? There is no databse connection but calls are made to
JBoss application server for each request that comes. Is this tomcat
problem if yes is there a workaround?????????
[ -=-=-=-=-=-=-=-=-=-=-=- Hrishikesh Kamat -=-=-=-=-=-=-=-=-=-=-=- ]
Trust Your Instincts
91 20 5511262 - Ext 465
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