Java and hyperthreading

Re: Java and hyperthreading

The hyperthreading processor appears to the system as two processors. In
order for your application to take advantage of multiple processors your OS
and VM need to support it. I know at least Sun's VM on windows does. In
addition to that, you application needs to have multiple threads running,
doing useful work. Otherwise, you'll never see more than 50% of the combined
CPU load being utilized.

"BlackHawke " <blackhawke@leg acygames.net> wrote in message
news:bfruo4$k2s [email protected] dspring.net...[color=blue]
> Hello!
>
> I have a java application (a game) which is supposed to run as a server.[/color]
It[color=blue]
> is on a dedicated machine with MP capabilities, but currently running 1[/color]
Xeon[color=blue]
> processor with hyperthreading.
>
> The hyperthreading is causing the process to receive no more than 50% of[/color]
the[color=blue]
> CPU cycles. I've been told that the app needs to be changed to be SMP[/color]
aware[color=blue]
> in order to use all hyperthreading.
>
> A few people have suggested turning hyperhtreading off in the BIOS, but[/color]
that[color=blue]
> has a noticeable performance decrees and actually didn't help the java
> program CPU cycles much. Any thoughts?
>
> Thanks!
>
> B-
> www.andromedaonline.net
>
>[/color]