heavy load configuration

[eiben]

Hi,

I'm currently conducting some performance-tests on a small web-app I wrote, that is running on JBoss 4.0.5GA. I currently have about 150 concurrent requests, which seems to kill my JBoss server (2x Xeon 1,3GHz, 2 GB RAM).

While the test is running I don't get any response from jboss anymore.

Why would that be? I already increased the memory for the JVM

set JAVA_OPTS=%JAVA_OPTS% -Xms512m -Xmx1024m -XX:PermSize=256m -XX:MaxPermSize=512m

is there anything else I could configure (like the number of threads or something?)

Any hints would be appreciated!

[dimitris]

You need to see what you application is doing. Most probably hammering the database on the backend without proper connection pooling and data caching.

[eiben]

well, I used EJB3 to create some simple business-objects. So basically I'm using this to access the data of the database.

I did however write some namedqueries to do some sort of lazy-eager fetching. (I have marked all attributes as lazy, but for some pages I need depending objects, so I use a named query with key keyword "fetch join" to get the depending data, so I can display all the data on my JSP page. Otherwise I had some trouble, because of detached entities)

[peterj]

Also see http://wiki.jboss.org/wiki/Wiki.jsp?page=SPECjAppServer2002Tuning. Though that wiki entry is primarily about the specjappserver benchmark, the tuning tipis can be applied to almost any application.

[eiben]

"PeterJ" wrote:
Also see http://wiki.jboss.org/wiki/Wiki.jsp?page=SPECjAppServer2002Tuning. Though that wiki entry is primarily about the specjappserver benchmark, the tuning tipis can be applied to almost any application.

OK, so I'm neither a Java expert nor a JBoss expert :). What I found at the wiki was mainly about tuning the garbage collection to run parallel threads and stuff.

Unfortunately that didn't improve the performance of my system :(

[eiben]

does anyone have some other hints?