Multicore on a Java application on solaris 8, JVM 1.4.2_12 64bits ?

Hello,
We have a solaris 8 server with eight Ultrasparc-III+ processors (8 cores/threads), so normally 64 logical cpu's.
We have a java application multithreaded ( actually NLWP is reporting 46 threads ).
What Solaris 8 command could I use to see if the JVM is using the cores of my 8 processors ?
I tried to use prstat -L -p <pid> but I only see at maximum 6 different cpuname in the state column. Other threads are in the sleep state, stop state, others in the run state.
For my understanding run state tell that the thread is waitting for cpu time (Runnable: process in on run queue. ).
But why don't I see more than a thread running on the same cpu, it's like only 8 threads can be ran at the same time, it's like the cores were not used ?
Thanks for your advises,
Best regards,
Francois

Interdit wrote:
But why don't I see more than a thread running on the same cpu, it's like only 8 threads can be ran at the same time, it's like the cores were not used ?What is the real question?
The OS controls thread scheduling for threads that need to do actual work.
If your threads are not doing actual work then they won't be doing anything. And you control the work with your code, neither the VM nor the OS controls that.

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