This brings up an interesting question (Well at least to me it is). I
notice that you refer to the iteration time "going down" as an expected
event. Are you saying that a new CPU is expect to get faster (If ever so
slightly) after an initial "Burn in" time??? Perhaps that is a bit of
common knowledge I have never heard of. Can someone explain this in
greater detail?
Thank You,
Chuck
On Wed, 13 Jan 1999, Leu Enterprises Unlimited wrote:
>
> Greetings!
>
> Aside from it's normal uses, I've been looking at using mprime as
> a QA and benchmarking tool.
>
> This is particularly important for overclocked Beowulf clusters,
> where reliability is a must. And given that the price of these
> is now so cheap (with a Gigaflop being achieved for under $10,000),
> adaquate Q.A. procedures are a must. Re: my observations on
> www.supercomputer.org.
>
> I've recently noticed something interesting. Namely, with the so-called
> effects of "burning-in" a CPU via mprime's torture test, and the
> resulting effects on the CPU speed (as determined by the mprime
> time test).
>
> On one CPU, after two days worth of burn-in, the time required to
> complete 100 iterations on the stock number went down, as I would expect.
>
> On a second CPU, the time actually *increased*. From 1 day, 18 hours,
> and 55 minutes, to 1d 19h 13m!
>
> So this leads me to wonder if what I'm seeing is real, or whether
> mprime is really sensitive enough to be used here. The O.S. being
> used is Linux.
>
> If mprime is indeed seeing some real effects here, I think people
> need to be aware of it. Or even if it's not suitable for this, people
> should also know.
>
> If anyone knowledgeable would care to comment about mprime's suitability
> for Q.A. and/or performance measurements, I would appreciate it.
>
> Thanks!
>
> -dwight-
>
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