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Anybody knows how to get number of CPU cores? [message #10832]

Wed, 01 August 2007 10:54

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

In Win32, Win64 and Linux/POSIX...

I have seen examples how to find a part of the information on one of system, but I would need implemenation for all (or most) platforms we support....

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Re: Anybody knows how to get number of CPU cores? [message #10834 is a reply to message #10832]

Wed, 01 August 2007 11:54

unodgs
Messages: 1366
Registered: November 2005
Location: Poland

Ultimate Contributor

luzr wrote on Wed, 01 August 2007 04:54

In Win32, Win64 and Linux/POSIX...

I have seen examples how to find a part of the information on one of system, but I would need implemenation for all (or most) platforms we support....

Have you seen this: ?
http://www3.intel.com/cd/ids/developer/asmo-na/eng/275339.ht m?cid=sw:multicore005

There is a CPUCOUNT.CPP which seemms to be able to detect how many cores a cpu has (see int MaxCorePerPhysicalProc(void))

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Re: Anybody knows how to get number of CPU cores? [message #10842 is a reply to message #10834]

Wed, 01 August 2007 15:39

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

Thanks, it provided really useful hints:

For Win32, it seems like we can use GetProcessAffinityMask(GetCurrentProcess(), &pa, &sa);
and count the number of non-zero bits in sa.

For Linux, it is simply sysconf(_SC_NPROCESSORS_CONF); (or perhaps _SC_NPROCESSORS_ONLN).

BSD, MacOSX, anybody? Smile