[Mingw-users] [mingw - C/C++] RE: sysconf not implemented ?

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By: poochner

Assuming (always dangerous) this is where Performance Monitor and its ilk get
their information, this returns the number of virtual cpus, not the number of
chips.  In this sense, I mean virtual as in hardware hyperthreaded, not any
sort of emulation.  That threw me off on some testing once until I realized
I had two CPUs with hyperthreading enabled in the box with four CPUs (two were
disabled on the board). So it looked like I had four CPUs, but I only had two
CPUs worth of cycles.  Turned on the other two, disabled hyperthreading, and
voila, normalcy.

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