Problems in a multiprocessor server

[escudojaguar]

I have a server with 2 cpu XEON(3GHz) and 4GB in RAM

I have installed Fedora Core 3 and JBOSS 4.0.2

JBOSS is initialized with next options:

/java -server -Xms1024m -Xmx2560m
-Dprogram.name=run.sh -Dcom.sun.management.jmxremote -Djava.endorsed.dirs=/opt/jboss-4.0.2/lib/endorsed -classpath /opt/jboss-4.0.2/bin/run.jar:/opt/java//lib/tools.jar org.jboss.Main

When I start Linux with a simple kernel(only sees 1 cpu) the processes I run are ok and have no problem, but when I start Linux with a kernel smp(sees the 2 cpu), the time these processes late is too long and never end.

I think it's a problem of syncronization between java and the cpu's.

What can I do to resolve this situation

Thanks

[peterj]

I have the vague recollection that not until the kernel that was part of RHEL 4 did multi-CPU processing become viable. But maybe my recollection is bad. We have been using RHEL 4 and higher on multiprocessor machines with no issues. I am running Fedora 6 on a dual-CPU machine with no issues.

Also, you never said which JVM you are using.

Any possibility you could upgrade to a more current release?

[escudojaguar]

I have jdk1.5.0_06 installed and I think the problem is not JBOSS but java, some parameter I need to configure.

Thanks.

[peterj]

You are correct that the problem is not JBoss-related. The only JVM-related parameter that I can think of that might have anything to do with this is -XX:-UseParallelGC to turn off the parallel garbage collector (given your machine, it is on by default). If that doesn't work, you might have better luck asking your question in a RedHat forum.

[escudojaguar]

Is there a parameter in java or in JBOSS related with use of cpu?

[peterj]

No. By default, the JVM will use all of the available CPUs. Some OSes, and some JVMs, can restrict which CPUs are available to an application (processor affinity).