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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject Re: [DRLVM][PORT] correct API to retrieve processor number
Date Wed, 01 Nov 2006 15:00:05 GMT
On 11/1/06, Alexey Varlamov <alexey.v.varlamov@gmail.com> wrote:
> Just a wild guess: this may be caused by x86 emulation on em64t
> (x86_64). SDK docs advise to use GetNativeSystemInfo() in such case,
> instead of currently used GetSystemInfo(). (See
> vm\port\src\misc\win\sysinfo.c).
>

huh, I guess you are right, since my machine is X86-64bit. :-) I will
try the API you pointed.

Thanks,
xiaofeng

> 2006/11/1, Xiao-Feng Li <xiaofeng.li@gmail.com>:
> > Yes, both SUN JRE and DRLVM returns 1 for me. Java API has the same
> > problem. :-) Probably it should introduce an
> > availableCoresPerProcessor() or something more comprehensive.
> >
> > Thanks,
> > xiaofeng
> >
> > On 11/1/06, Mikhail Fursov <mike.fursov@gmail.com> wrote:
> > > On 11/1/06, Xiao-Feng Li <xiaofeng.li@gmail.com> wrote:
> > > >
> > > > Are you using Linux? Don't know why it doesn't work for my Pentium D.
> > > > Actually my Windows seems not show two processors at first, while the
> > > > API may depend on OS. My Linux has no problem with this.
> > > >
> > > > On the other hand, even your case is undesirable for Hyperthreading
> > > > since we probably want more detailed info about processor(s) since
> > > > hyperthreading sometimes wants to be treated differently than real SMP
> > > > (or dual-core).  I believe there is such kind of API available
> > > > somewhere, at least NUMA support of Linux from SGI has it.
> > > >
> > >
> > > I use WindowsXP and here is more detailed info about CPU:
> > > Number of processors  1
> > > Number of cores  1 per processor
> > > Number of threads  2 (max 2) per processor
> > > Name  Intel Pentium 4 660
> > > Code Name  Prescott
> > > Specification  Intel(R) Pentium(R) 4 CPU 3.60GHz
> > > Package  Socket 775 LGA
> > >
> > > And I see 2 CPUs in Windows Task Manager.
> > >
> > > Did you tried Runtime.getRuntime().availableProcessors()  ?
> > >
> > >
> > >
> > > --
> > > Mikhail Fursov
> > >
> > >
> >
>

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