[Beowulf] 96 cores in silent and small enclosure

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Wed Apr 14 12:53:41 EDT 2010


It's a huge field of research. Yes, there are differences from the materials
involved and the actual temperature, but the 10 degrees=factor of 2 is a
decent starting point.

It's one of those things where you can start simple, but for any non-trivial
case, it gets real complex.

Don't forget that the temperature across the die varies pretty substantially
too, so the "aging" will be different in different parts of the die.

For people who really care (e.g. My colleagues and I building spacecraft),
you have a team of people who understand device physics study the device,
and then you might do testing.


On 4/14/10 8:41 AM, "Jon Tegner" <tegner at renget.se> wrote:

> I have no clue of how to do this "distillation process" - it is not my field.
> How would you do this? Do you have the numbers for any cpu?
> 
> And Arrhenius - again, semiconductors is not my field - would a 10 degree rise
> halve the life span irrespective of activation energy and temperature range?
> 
> 
> On Apr 14, 2010 15:49 "Lux, Jim (337C)" <james.p.lux at jpl.nasa.gov>
> <mailto:james.p.lux at jpl.nasa.gov>  wrote:
>> Start with Arrhenius.. 10degree rise halves the life.
>> 
>> Actually, there¹s a huge amount of information out there on
>> semiconductor failure and life effects. It¹s just not distilled down to
>> a ³for part #, here¹s what happens², because it depends on a lot of
>> things.
>> 
>> 
>> On 4/14/10 1:12 AM, "Jon Tegner" <<tegner at renget.se>> wrote:
>>>> the max temp spec is not some arbitrary knob that the chip vendors
>>>> choose out of spiteful anti-green-ness. I wouldn't be surprised to
>>>> see some
>>>> 
>>>> ****************************************************************
>>>> 
>>>> Issue is not the temp spec of current cpus, problem is that it is
>>>> hard to get relevant information. I haven't found any that states
>>>> that the failure rate in year 5 should be significantly higher if
>>>> you operate the cpu at 65 C instead of 55 C. I'm just saying this
>>>> kind of information would be valuable (and I would be glad to find
>>>> it).
>>> 
> 


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