Java threads on multiple processor cores

[Jurij Kovacic, OCPEA d.o.o.]

Hello!

On 02/24/2013 10:50 PM, Ronald Klop wrote:
> On Sat, 23 Feb 2013 04:46:12 +0100, Jurij Kovacic, OCPEA d.o.o. 
> <jurij.kovacic at ocpea.com> wrote:
>
>> Hi,
>>
>> I am running JBoss application server inside a jail on FreeBSD 8.3. 
>> Since the server has a quad-core processor, it would be efficient if 
>> the java process (and its threads) could utilize more than 1 CPU core 
>> at a time, which is not currently the case.
>>
>> Is it possible to acomplish this (perhaps with the use of a proper 
>> threading library) or am I barking up the wrong tree?
>>
>> Thank you for your reply,
>> Jurij
>
> I don't think there is a clear answer on this. It all depends on what 
> is running in your JBoss application server. If that application does 
> not use more than one thread, there is nothing going to use the other 
> cores. If your application uses multiple threads and you are sure they 
> should all be calculating very hard than you should debug the 
> application for bottlenecks. And look if the bottleneck is in the 
> application code, in the JDK or in FreeBSD. This is not possible 
> without inside information of what your application is doing.
First of all, thank you very much for your reply.

As it has turned out, I was not too precise in my earlier question - 
after some testing I have found  that after some intense page reloading, 
full GC gets triggered. The thread running uses 100% of one core,while 
all the other threads (presumably), have to wait for it to finish. Is 
there any way to make full GC run in multiple threads?

Kind regards,
Jurij