On 10/10/21 5:21 AM, Stefan Kangas wrote:
> Omar Polo <op@omarpolo.com> writes:
>> OpenBSD disables hyperthreading by default so HW_NCPU is (almost) always
>> misleading.  For example, on my machine
>>
>>          % uname -a
>>          OpenBSD venera 7.0 GENERIC.MP#221 amd64
>>          % sysctl hw.ncpu
>>          hw.ncpu=8
>>          % sysctl hw.ncpuonline
>>          hw.ncpuonline=4
>>
>> and this has been the case for a while already (I mean, a couple of
>> years if not more.)
> 
> BTW, Gnulib doesn't seem to make this distinction (lib/nproc.c:313).
> Maybe that should be reported to the Gnulib developers?


No need for a bug report as I'm one of those developers. To fix the 
Gnulib nproc OpenBSD issue I installed the first attached patch into 
Gnulib, and to port Emacs's recently-added processor-count code to more 
platforms I installed the second attached patch into Emacs's emacs-28 
branch. Although I think the latter patch means that 
emacs/src/w32proc.c's w32-get-nproc function can be removed, I'll let 
the Emacs MS-Windows experts opine on that.