I don't think it would be necessary to do any programming. Just run another program at the same time.
On 1/15/07, Ulrike Grömping <[EMAIL PROTECTED]> wrote: > 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?]couldn't > > > reproduce with any other > > > software (sometimes [WINDOWS-1252?]it's 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?]I've 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?]I've asked about this issue does > > > not have any idea and > > > suspects R to do something peculiar that causes the noise. > > > [WINDOWS-1252?]It's not the > > > mainboards fault (that has already been changed for another reason, and > > > the > > > behavior remains). I [WINDOWS-1252?]can't definitely locate the source of > > > the sound. I > > > suspect that [WINDOWS-1252?]it's 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?]processor's 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]] > > > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel