weblogic memory

Posted on 2010-09-09
Medium Priority
Last Modified: 2013-12-10

Can i increase my memory settings on weblogic for each managed server, currently they are:

set MEM_ARGS=-Xms512m -Xmx1536m -XX:MaxPermSize=512m

i am using 64 bit weblogic 923 with JROCKIT  R27.5.0-jdk1.5.0_14

pls advise

Question by:rutgermons
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LVL 10

Accepted Solution

ECollin earned 2000 total points
ID: 33634428
i should say "why not ?"
-First of all, in a production environment, you should set -Xms at the same value as -Xmx : -Xms:1536m -Xmx:1536m
-Are you facing memory issues ?
-What kind of applications are deployed in your domain : Web app, portal, ejbs... ?


Author Comment

ID: 33634692
Hi Emmanuel

We deploy maximo which is a web app via weblogic  (maximo.ear) file

we had maxpermsize memory issues at 256 but increased it to 512 and it seems better, our big issue seems if we run complex queries from the front end on a cluster then the users would get kicked out of the application

the funny thing is, is that using a standalone appserver pointing to the same database we cannot replicate this error, this leads me to think the iss plugin is problematic, I also see a lot of multicast messages are getting lost and i get an error message in wlproxy.log:

Thu Sep 09 01:58:14 2010 <1764128401519417> failure on sendRequest() w/ recycled connection to, numfailures=1, lastError=0
Thu Sep 09 01:58:14 2010 <1764128401519417> Marking as bad
Thu Sep 09 01:58:14 2010 <1764128401519417> Exception occurred for backend host '' while sending request : 'PROTOCOL_ERROR [line 842 of ..\nsapi\.\URL.cpp]: Backend Server not responding'
Thu Sep 09 01:58:14 2010 <1764128401519417> got exception in sendRequest phase: PROTOCOL_ERROR [line 842 of ..\nsapi\.\URL.cpp]: Backend Server not responding at line 959; last_error 0

it seems our managed servers are losing connection to the cluster thats why the kickouts

any ideas?

LVL 10

Expert Comment

ID: 33635568
you can try to replace your IIS by a simple web app deployed in a stand alone weblogic server that will act as a proxy in front of your cluster (via HttpClusterServlet).  That's for checking your cluster communications.
Related doc : http://download.oracle.com/docs/cd/E13222_01/wls/docs92/cluster/setup.html#wp684345

Author Comment

ID: 33635968
will it handle the big user load? we have 200 concurrent users over 14 managed servers?
LVL 10

Expert Comment

ID: 33644214
woah !
So many servers for so few concurrent users...
Well tuned i think you could handle all your users with only one managed server...
How many concurent http sessions do you have to handle ?
Why do you need a cluster ?

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