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Re: NetBSD # actual cores
Date: Thu, 4 Jan 2024 09:13:17 -0600
From: Jason Bacon <jtocino%gmx.com@localhost>
Message-ID: <b4566134-0f0e-4d76-a98a-79d5741c9f6b%gmx.com@localhost>
| Is there a way to detect whether hyperthreading is enabled? If we have
| that, we can divide hw.ncpu by 2.
No you cannot. Not on modern processors. On my system NetBSD
reports 24 cpus, and hyperthreading is enabled - but that is not
12 cores, there are 16. 8 of the cores support hyperthreading,
the other 8 do not.
If we are going to implement something like this, do it in a
general way which supports current, and likely future, systems.
Not a hack which just seems like it might work.
kre
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