*slaps forehead* Thanks. So out it goes, that hyperthreading. Who invented hyperthreading on a quad-core anyway?
Cheers Joris 2010/6/29 Uwe Ligges <lig...@statistik.tu-dortmund.de>: > > > On 29.06.2010 15:30, Joris Meys wrote: >> >> Dear all, >> >> I've recently purchased a new 64bit system with an intel i7 quadcore >> processor. As I understood (maybe wrongly) that to date the 32bit >> version of R is more stable than the 64bit, I installed the 32bit >> version and am happily using it ever since. Now I'm running a whole >> lot of models, which goes smoothly, and I thought out of curiosity to >> check how much processor I'm using. I would have thought I used 25% >> (being one core), as on my old dual core R uses 50% of the total >> processor capacity. Funny, it turns out that R is currently using only >> 12-13% of my cpu, which is about half of what I expected. >> > > An Intel Core i7 Quadcore has 8 virtual cores since it supports > hyperthreading. R uses one of these virtual cores. Note that 2 virtual cores > won't be twice as fast since they are running on the same physical core. > Hence this is expected. > > Uwe Ligges > > > >> Did I miss something somewhere? Should I change some settings? I'm >> running on a Windows 7 enterprise. I looked around already, but I have >> the feeling I overlooked something. >> >> Cheers >> Joris >> >> sessionInfo() >> R version 2.10.1 (2009-12-14) >> i386-pc-mingw32 >> >> locale: >> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United >> States.1252 LC_MONETARY=English_United States.1252 >> [4] LC_NUMERIC=C LC_TIME=English_United >> States.1252 >> >> attached base packages: >> [1] grDevices datasets splines graphics stats tcltk utils >> methods base >> >> other attached packages: >> [1] svSocket_0.9-48 TinnR_1.0.3 R2HTML_2.0.0 Hmisc_3.7-0 >> survival_2.35-7 >> >> loaded via a namespace (and not attached): >> [1] cluster_1.12.3 grid_2.10.1 lattice_0.18-3 svMisc_0.9-57 >> tools_2.10.1 >> >> > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Applied mathematics, biometrics and process control tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.