(Please excuse the boring licensing details, but I've seen a lot of
misinformation on this topic.)

Microsoft Windows is licensed per-processor, not per-core. XP Home
supports 1 processor and XP Pro supports 2 processors. Each processor
may have multiple cores. Server versions can support more than 2
processors but you pay for them. (Vista works similarly.)

I've got a machine running Windows XP Home with 2 cores (Athlon X2)
and it definitely uses both cores. And it's running Tomcat. :-)

reference: http://www.microsoft.com/licensing/highlights/multicore.mspx
-- 
Len

On Thu, Feb 28, 2008 at 4:43 PM, Alan Chaney
<[EMAIL PROTECTED]> wrote:
> XP Home only supports one core - however, that would hardly be an OS for
>  a production web server (grin)
>
>  XP Professional is limited to 2 cpus
>
>  I would suspect that the OPs factors were related to IO Bandwidth or
>  running out of threads as suggested earlier. I've found that a modern
>  multicore machine doesn't actually spend very much time processing the
>  Tomcat stuff at all.
>
>
>
>
>  Caldarale, Charles R wrote:
>  >> From: Christopher Schultz [mailto:[EMAIL PROTECTED]
>  >> Subject: Re: Does tomcat support multicores
>  >>
>  >> | Doesn't XP limit itself to two cores?
>  >>
>  >> I don't think so.
>  >
>  > I'm sure some versions of XP are limited to two CPUs, since that was a
>  > concern when HyperThreading was all the rage.  It may be just the Home
>  > edition, rather than Pro.  I know the Windows Server versions (different
>  > license than XP) all support at least four CPUs.
>  >
>  >  - Chuck
>  >
>  >
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