> On Feb 5, 2016, at 4:26 AM, peter dalgaard <pda...@gmail.com> wrote: > > Sorry, saw the bugzilla item first... > > I have > > Peters-iMac:IBP pd$ sysctl -n hw.ncpu > 2 > Peters-iMac:IBP pd$ sysctl -n hw.physicalcpu > 2 > Peters-iMac:IBP pd$ sysctl -n hw.logicalcpu > 2 > Peters-iMac:IBP pd$ ssh appleserver > Last login: Mon Dec 14 11:25:08 2015 > appleserver:~ pd$ sysctl -n hw.ncpu > 24 > appleserver:~ pd$ sysctl -n hw.physicalcpu > 12 > appleserver:~ pd$ sysctl -n hw.logicalcpu > 24 > > both on Mavericks, 10.9.5. As you probably gathered (or remembered), the iMac > is Core 2 Duo, so no hyperthreading.
On El Cap running on the oldest macPro (early 2008), I think this earliest machine El Cap supports: Model Identifier: MacPro3,1 Processor Name: Quad-Core Intel Xeon Processor Speed: 2.8 GHz Number of Processors: 2 Total Number of Cores: 8 I get: $ /usr/sbin/sysctl -n hw.physicalcpu 8 $ /usr/sbin/sysctl -n hw.logicalcpu 8 -- David. > > -pd > > > On 05 Feb 2016, at 13:07 , Prof Brian Ripley <rip...@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, rip...@stats.ox.ac.uk >> Emeritus Professor of Applied Statistics, University of Oxford >> >> _______________________________________________ >> R-SIG-Mac mailing list >> R-SIG-Mac@r-project.org >> https://stat.ethz.ch/mailman/listinfo/r-sig-mac > > -- > Peter Dalgaard, Professor, > Center for Statistics, Copenhagen Business School > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > Phone: (+45)38153501 > Office: A 4.23 > Email: pd....@cbs.dk Priv: pda...@gmail.com > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-mac David Winsemius Alameda, CA, USA _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac
