Duncan Murdoch wrote: > Markus Preisetanz wrote: >> ... I have exactly the same issue with R 2.3.1 . The Question is: Why is R >> unable to take more CPU space to make the calculation process go faster? >> >> In my case no hardisk nor any network device is involved (data in RAM, 600 >> of 1024 MB filled) - and the CPU usage of the rgui-process does not exceed >> 50%. >> >> Has anybody an idea? Is there a setting a can change? >> > You are probably on a dual core or hyperthreaded machine. R does almost > all of its work in one thread, so it will max out the usage on one cpu, > but not more than one. > > If you are on a hyperthreaded machine, you can disable hyperthreading > and the report should show 100% usage, but that doesn't mean things will > be going twice as fast. (I have heard that hyperthreading does slow > down some computations, so turning it off might be a good idea, but I > have never done the measurements myself.)
Highly depends on the task. I have seen two WinBUGS processes on a hyperthreading machine making full use of hyperthreading and surpisingly completing *both* in the same time as one on the same machine with hyperthreading disabled. I don't think Intel folks will find many of such impressive examples ... Uwe Ligges > > Duncan Murdoch >> >> Sincerely, Markus >> ____________________________ >> Markus Preisetanz >> Consultant >> >> Client Vela GmbH >> Albert-Roßhaupter-Str. 32 >> 81369 München >> fon: +49 (89) 74217-113 >> main: +49 (89) 74217-150 >> fax: +49 (89) 74217-250 >> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> >> http://www.clientvela.com <http://www.clientvela.com/> >> >> Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte >> Informationen. Wenn Sie nicht der richtige Adressat sind oder diese E-Mail >> irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und >> vernichten Sie diese Mail. Das unerlaubte Kopieren sowie die unbefugte >> Weitergabe dieser E-Mail ist nicht gestattet. >> >> This e-mail may contain confidential and/or privileged information. If you >> are not the intended recipient (or have received the e-mail in error) please >> notify the sender immediately and destroy this e-mail. Any unauthorized >> copying, disclosure or distribution of the material in this e-mail is >> strictly forbidden >> >> xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx >> From: Doran, Harold <HDoran_at_air.org >> <mailto:HDoran_at_air.org?Subject=Re:%20%5BR%5D%20CPU%20Usage%20with%20R%202.1.0%20in%20Windows> >> > >> Date: Wed 20 Jul 2005 - 04:59:34 EST >> >> >> >> Dear Michael: >> >> Why is it a problem that R is not using more CPU space than it seems to >> need? >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Greene, Michael Sent: Tuesday, July >> 19, 2005 2:29 PM >> To: '[EMAIL PROTECTED]' >> Subject: [R] CPU Usage with R 2.1.0 in Windows >> >> Hi, >> >> I'm using a fairly simple HP Compaq desktop PC running Windows 2K. When >> running a large process in R, the process "RGUI.exe" will never exceed 50% >> of the CPU usage. >> >> The program used to be able to use more of the computer, but does not now. >> I don't believe this is a multiple processor machine. >> >> Can anyone give any advice on how to solve the problem? >> >> Thanks, >> >> Michael Greene >> >> Product Management >> Plymouth Rock Assurance Corp >> 617-951-1682 >> >> >> [[alternative HTML version deleted]] >> >> >> ------------------------------------------------------------------------ >> >> ______________________________________________ >> [email protected] 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. >> > > ______________________________________________ > [email protected] 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. ______________________________________________ [email protected] 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.
