[R-SIG-Mac] detecting cores

[Charles DiMaggio]

Ah. Cut and pasted too quickly…

$ /usr/sbin/sysctl -n hw.physicalcpu
4
$ /usr/sbin/sysctl -n hw.logicalcpu
8

Charles DiMaggio, PhD, MPH
Professor of Surgery and Population Health
Director of Injury Research
Department of Surgery






On Feb 5, 2016, at 7:17 AM, Prof Brian Ripley <ripley at stats.ox.ac.uk> wrote:

> 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
>>> 
>>> _______________________________________________
>>> R-SIG-Mac mailing list
>>> R-SIG-Mac at r-project.org <mailto:R-SIG-Mac at r-project.org>
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>> 
> 
> 
> -- 
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> Emeritus Professor of Applied Statistics, University of Oxford


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