detecting cores
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. -pd
On 05 Feb 2016, at 13:07 , 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
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Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com