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From Robby Pelssers <>
Subject RE: scaling problem
Date Fri, 21 Oct 2011 12:44:08 GMT
For what it's worth... check this thread and see if this applies:


-----Original Message-----
From: Paul Joseph [] 
Sent: Friday, October 21, 2011 2:42 PM
Subject: scaling problem

Hi there,

I have been supporting a cocoon app for several years and it has been 
quite successful when about 10 users are accessing it at the same time, 
in the 32 bit Windows/Tomcat envrionment.

Now, the app is being used by larger groups and in higher numbers.  So I 
put it on in Windows 64 bit, using the new JDK 7 64 bit release and 
Tomcat 64, all on a server class machine.

I specified max memory to be 3500 MB.

A recent load test showed that searches are a problem.  When a user runs 
a search and retrieves 1000 records, after several users doing this 
several times, the JVM runs out of memory.

I estimate it takes a retrieval of a total of 500,000 records (adding up 
each user's queries) before the server runs out of memory...

I tried the new garbage collector by specifying in Tomcat's Java options 
-XX:+UseG1GC  but this seems to have little effect.

Any suggestions would be appreciated.


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