Ondrej Valik wrote:
>I need to detect number of cores per processor programmatically. I
>already tried:
>
>int procCount = 0;
>size_t length = sizeof(procCount);
>int error = sysctlbyname("hw.physicalcpu", &procCount, &length, NULL,
>0);
>
>with "hw.physicalcpu", "hw.logicalcpu", but I always got 4 on my
>MacPro.
>
>Also MPProcessors() returns 4.
>
> Thanks in advance for any suggestions.
> Valda
Running 'sysctl machdep' from the Terminal shows a couple of possible
values:
machdep.cpu.logical_per_package: 2
machdep.cpu.cores_per_package: 2
This is on a Mac Pro, where MPProcessorsScheduled returns 4.
If this is to cap a thread count, vs display/record this info, then the
best choice would be something like MPProcessorsScheduled.
Normally you wouldn't care how many cores vs CPUs are present, but you
probably want to use fewer threads if the user has some CPUs turned off.
-dair
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