Messages in this thread | | | Date | Mon, 16 Dec 2002 09:10:30 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: /proc/cpuinfo and hyperthreading |
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On Mon, 16 Dec 2002, Brian Jackson wrote:
> You could always boot once with nosmp and run some benchmarks and then > reboot (with smp) and run some more benchmarks, and see if there is a > difference. > > --Brian Jackson > > > Scott Robert Ladd writes: > > > Zwane Mwaikambo wrote: > >> It's ok. > > > > I'm not so sure. > > > > To get the most benefit from two logical CPUs, don't I need the kernel to > > operate as a 2-CPU SMP system? > > > > Windows XP initializes the system as SMP with two CPUs; when I run an OpenMP ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ How do you know this? How can I learn what Windows does with Win/2000/professional? The only way I know I have two CPUs is when the machine fails to reboot because the file-system has been completely trashed by the two CPUs banging on it at the same time. The solution has been to remove one CPU. M$ claims; "Windows will over-power the system if two CPUs are present...." Direct quote. If you have two logical CPUs, you can't remove one, therefore, unless M$ has fixed the problem(s) in XP, you can't use Windows with two logical CPUs, i.e., hyperthreading.
> > application under Windows, it reports two CPUs and a maximum of two threads. > > Under Linux, > >
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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