Duncan, thanks. Not knowing what is a quiet or noisy loop beforehand, I wouldn't like to do my programming around that theme though :-) By the way, does your phrase "noisy CPUs" suggest noisy types of CPU or noisy individuals of generally ok types of CPU (you might not know that, though)? Regards, Ulrike
---------- Original Message ----------- From: Duncan Murdoch <[EMAIL PROTECTED]> To: Ulrike Grömping <[EMAIL PROTECTED]> Cc: r-devel@r-project.org Sent: Mon, 15 Jan 2007 13:07:10 -0500 Subject: Re: [Rd] Whine in dual core Windows PC if R uses full CPU capacity > On 1/15/2007 12:02 PM, Ulrike Grömping wrote: > > Dear R-developers, > > > > the following may seem a weird question for R-devel [WINDOWS-1252?] I try > > anyway, because it > > does seem to be related to usage of R and R's way of interacting with the > > hardware. > > > > When running R (2.4.0) on my new dual core Windows XP system (Intel Core 2 > > Duo > > E6600, Mainboard ASUS P5B, BeQuiet Power Unit), I observe various types of > > sounds (not related to fans) when running at full usage of at least one of > > the > > cores. > > > > The most annoying sound [WINDOWS-1252?] a high-pitched noise like a whine > > [WINDOWS-1252?] I have so far > > observed running simulations in R only and [WINDOWS-1252?]couldnt > > reproduce with any other > > software (sometimes [WINDOWS-1252?]its also more a rustle than a whine, > > that one is not > > disturbing). I can clearly track it down to particular instances of R > > [WINDOWS-1252?] as > > soon as I left-click on a blue window bar in the affected R-Gui, the noise > > stops (and there are sometimes other instances of R running in parallel > > which > > are completely unrelated to the whine). [WINDOWS-1252?]Ive also stopped R > > when the computer > > just whined and started SAS, fully using the CPU as well [WINDOWS-1252?] > > no whine. Shut down > > SAS, restart R à whine again. Apparently, it can also be related to what > > exactly R is doing at the particular moment. For example, I just discovered > > that simulations of one type were finished, because the computer > > [WINDOWS-1252?] running > > another simulation under full load on R in a quiet way [WINDOWS-1252?] > > started whining at > > the moment it switched to the new type of simulation. > > > > The hardware technician [WINDOWS-1252?]Ive asked about this issue does not > > have any idea and > > suspects R to do something peculiar that causes the noise. > > [WINDOWS-1252?]Its not the > > mainboards fault (that has already been changed for another reason, and the > > behavior remains). I [WINDOWS-1252?]cant definitely locate the source of > > the sound. I > > suspect that [WINDOWS-1252?]its the Power Unit, but there are so many > > parts close together > > that I am not really sure. > > > > I do not know enough about interactions of R with hardware to know whether > > it > > is even possible for anyone deeper into the matter to develop an idea what > > could be behind this behavior. For the moment, I can get rid of the whine > > by > > using the mainboard tool [WINDOWS-1252?]AI [WINDOWS-1252?]Gear to reduce > > the [WINDOWS-1252?]processors speed from 2.4GHz > > to 1.7GHz when I want to concentrate [WINDOWS-1252?] then the whine is > > gone (but the > > simulation is slower). > > I haven't heard this from R, but on occasion I've had noisy CPUs. I > suspect it's a case of some repetitive calculation leading to repetitive > electric fields which happen to cause physical resonance of some part of > your system. That agrees with the observation that changing the speed > changed the noisiness. Another way to get rid of it would be to change > the contents of the loop: make it run faster or slower and the noise > should go away. > > Duncan Murdoch > > > > > Does anyone have any idea [WINDOWS-1252?] or hints regarding what else I > > could think about ? > > > > Regards, Ulrike > > > > ****************************** > > Prof. Dr. Ulrike Grömping > > Fachbereich II > > TFH Berlin > > Luxemburger Str. 10 > > 13353 Berlin > > mail: [EMAIL PROTECTED] > > www: www.tfh-berlin.de/~groemp/ > > ****************************** > > > > ------- End of Forwarded Message ------- > > > > ****************************** > > Prof. Dr. Ulrike Grömping > > Fachbereich II > > TFH Berlin > > Luxemburger Str. 10 > > 13353 Berlin > > mail: [EMAIL PROTECTED] > > www: www.tfh-berlin.de/~groemp/ > > ****************************** > > > > > > > > [[alternative HTML version deleted]] > > > > > > > > ------------------------------------------------------------------------ > > > > ______________________________________________ > > R-devel@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-devel ------- End of Original Message ------- [[alternative HTML version deleted]]
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