Re: Detecting CPUs and cores

On Mon, 30 Jul 2007 21:59:10 +0100, Joshua Cranmer <Pidgeot18@xxxxxxxxxxx> wrote:

On Mon, 30 Jul 2007 13:25:52 -0500, Chris wrote:

Is there any way for Java to detect the number of CPUs that are
available? Runtime.getRuntime().availableProcessors() returns the number
of cores, not CPUs.

I don't think that is possible. The only OS I have experience with is
Windows, and that treats a dual-core as two CPUs; I believe that *nix
systems do the same as well.

I think that's reasonable behaviour. My dual-core Mac does the same under OS X.

What's slightly less helpful is that my Windows PC at work returns 2 from availableProcessors() despite the fact that it is single-core, albeit with Intel's Hyper-Threading.

Finding out any more about the processors is probably going to require some JNI.

Dan.

--
Daniel Dyer
http//www.uncommons.org
.

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