[R-SIG-Mac] detecting cores

[Roy Mendelssohn - NOAA Federal]

OSX 10.10.5 2.2 GHz Intel Core i7

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

> On Feb 5, 2016, at 9:24 AM, Adrian Dușa <dusa.adrian at unibuc.ro> wrote:
> 
> On 10.9.5, Processor  2,7 GHz Intel Core i7, 2013
> 
> $ /usr/sbin/sysctl -n hw.physicalcpu
> 4
> $ /usr/sbin/sysctl -n hw.logicalcpu
> 8
> 
> 
> On Fri, Feb 5, 2016 at 2:07 PM, Prof Brian Ripley <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
>> Emeritus Professor of Applied Statistics, University of Oxford
>> 
>> _______________________________________________
>> R-SIG-Mac mailing list
>> R-SIG-Mac at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>> 
> 
> 
> 
> -- 
> Adrian Dusa
> University of Bucharest
> Romanian Social Data Archive
> Soseaua Panduri nr.90
> 050663 Bucharest sector 5
> Romania
> 
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> 
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**********************
"The contents of this message do not reflect any position of the U.S. Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
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e-mail: Roy.Mendelssohn at noaa.gov www: http://www.pfeg.noaa.gov/

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