Subject: Re: Power dissipation under linux
From: Robert Serphillips (rserphillips@austin.rr.com)
Date: Mon Feb 18 2002 - 22:08:05 MST
How are you measuring die temps? Just be aware that the TAU is officially broken on the 74xx series and even if your lucky enough to get one that is partially functional the reading will be ridiculously inaccurate. I've noticed that while seti does bang on the part pretty hard, you can stress the cpu out even harder by just cycling sleep mode. Not sure how you will accomplish this with linux though as power managment has never seemed to work for me. I've used a water head on a 733 machine and found that by continuously waking the part from sleep, temps would reach as high as 60C. Make sure you have a very controlled cooling system.
-Rob
On Mon, 18 Feb 2002 09:11:41 -0800
Jim Potter <jrp@wvi.com> wrote:
> I'm working on a high-end embedded system that uses multiple 745x cpus
> and I'm stress-testing the cooling system. After running some of the
> popular 'scientific' applications (set@home, distributed.net, etc) I
> have noticed that the system seems to throw off the most heat when all
> CPUs are idle.
>
> Does anyone have a favorite application or code sequence to make some
> 1ghz CPUs dissipate the most heat? Thanks.
>
> --
> Sincerely,
>
> Jim Potter
> 45th Parallel Processing
>
>
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