JBoss performances

[giro]

Hi,

I work on an EJB project (about 50 entity beans and 5 sesssion beans)and we are using Jboss 3.0.2+ Tomcat 4.0.4. The database is MySql 3.23.49. The project is on Windows 2000.
The JVM memory is Xmx=256M, Xms=256M
Actually, we are doing some bench tests, about 100 users.

We noted the following:
- the transaction response time average starts to degrade at 50-60 users,
- a big number of http requests were refused by the server (why?)
- the number of throughputs increases at the beginning, and then it decreases (isnt'n normal!)

Could someone give me some hints about where to look for improve the performances:
- modify the parameters of the EJB container?
- the database connexion pool (increase the number of the connexions in the pool)?
- the web server (put a Apache server in frontal of JBoss)?
- use an another JVM (IBM or BEA)?

I don't know where is the bottleneck.

Thanks,

Giro

[jpjjansen]

Yo,

From my experiences I can tell that it's definately worth to look into installing IBM's JVM. I experienced a huge speed increase (maybe twice) while stress-testing my application.

Im also searching for more pointers to improve app-performance. You might look into using opensymphony software (http://www.opensymphony.com) to speed things up.

Regards,
JJ

[dancornell]

One basic thing you might want to check would be the Tomcat configuration. Out of the box the settings don't support that much of a load. Try tweaking the minProcessors, maxProcessors, and acceptCount properties in the tomcat-service.xml file. I've forgotten to tweak those before and JBoss/Tomcat starts tripping all over itself way before it ought to.

Just as a general Good Idea (TM) set enableLookups to false. Doing all the reverse lookups is a huge bottleneck that you don't want to bother with. Might not be affecting you if you're on a local network with a single load client, but down the line...


Dan

[juha]

Dan,

would you mind posting these Tomcat performance optimization tips to the FAQ forum?

[dancornell]

Done. They are posted in the thread about configuring Apache/Tomcat/JBoss at:

<http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t=forums/