JBoss not scaling on 4 CPU Sun machine

[greiff]

We have a J2EE application (Statefull and Stateless Session Beans + CMP Entity Beans) running on JBoss 3.0.4
We are expeiencing scalability problems on our 4 CPU sun machine.
The JBoss Server is only using 1 of the processors.
Is there a way to tell JBoss to use all CPU's


thx in advance
Torsten

[clebert.suconic]

This is 3.0.4, right?

We have found some problems with GUID and UID hashcodes what keeps a hashTable taking more time and CPU to process.

If you upgrade to latest 3 version this problem is fixed.

Also you should consider using "cmp2.x jdbc2 pm" container configuration, which is much faster.

[greiff]

thanks for your reply

but why is the JBoss process not using all the CPU's ?
I thought that every session bean is running in its own thread which could be connected to a native OS thread (we are using Sun's JDK 1.4.2_08)

[clebert.suconic]

Any application server will have resources shared across multiple threads.

It could be a datasource, a transaction manager.. anything.

On this case this was a synchronization issue. A static resource taking more time than expected causing a synchronization issue.

Whenever you have this problem again, use a kill -3, and that will generate a thread dump. With the thread dump we can verify where is the contention. (it could be even your own contention).

[greiff]

Thanks for the info.
We will do some profiling of the application


Torsten