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. 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.Meys at Ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
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 > >