On 1/15/2007 2:38 PM, Ulrike Grömping 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)?
I think I've only come across it a couple of times, and didn't have any replication, so I don't know if they were unusual individuals or a design problem. From your description of replacing the mb, it sounds as though it's a design problem -- unless as Uwe suggested, it's a power supply or some other part that you didn't replace. Duncan Murdoch > 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 ------- > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
