[R-SIG-Mac] detecting cores

[Prof Brian Ripley]

On 05/02/2016 12:13, Charles DiMaggio wrote:
> Running 10.9.5 on 3.7Ghz Quad-Core:
>
>
> $ /usr/sbin/sysctl -n hw.physicalcpu
> 4
> $ /usr/sbin/sysctl -n hw.logicalcp
> second level name logicalcp in hw.logicalcp is invalid

Thanks, but it is hw.logicalcpu we need to check.

>
>
> Charles DiMaggio, PhD, MPH
> Professor of Surgery and Population Health
> Director of Injury Research
> Department of Surgery
> New York University School of Medicine
>
>
>
>
>
>
> On Feb 5, 2016, at 7:07 AM, Prof Brian Ripley <ripley at stats.ox.ac.uk
> <mailto:ripley at stats.ox.ac.uk>> wrote:
>
>> sysctl on 10.11 has options which would enable us to differentiate
>> between logical and physical codes on parallel::detectCores ---
>> however these are not documented in Apple's online man pages, which
>> are for 10.9.  Could someone running 10.9 and someone for 10.10 report if
>>
>> /usr/sbin/sysctl -n hw.physicalcpu
>> /usr/sbin/sysctl -n hw.logicalcpu
>>
>> run in a terminal work and gives the correct result?  (Normally the
>> second will be twice the first taking account of hyperthreading.)
>>
>> Thanks in advance.
>>
>> --
>> Brian D. Ripley, ripley at stats.ox.ac.uk <mailto:ripley at stats.ox.ac.uk>
>> Emeritus Professor of Applied Statistics, University of Oxford
>>
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>


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford