[Beowulf] Theoretical vs. Actual Performance

[John Hearns]

Oh, and use the Adaptive computing HPL calculator to get your input file.
Thanks Adaptive guys!

On 22 February 2018 at 16:44, Michael Di Domenico <mdidomenico4 at gmail.com>
wrote:

> i can't speak to AMD, but using HPL 2.1 on Intel using the Intel
> compiler and the Intel MKL, i can hit 90% without issue.  no major
> tuning either
>
> if you're at 33% i would be suspect of your math library
>
> On Thu, Feb 22, 2018 at 9:37 AM, Prentice Bisbal <pbisbal at pppl.gov> wrote:
> > Beowulfers,
> >
> > In your experience, how close does actual performance of your processors
> > match up to their theoretical performance? I'm investigating a
> performances
> > issue on some of my nodes. These are older systems using AMD Opteron 6274
> > processors. I found literature from AMD stating the theoretical
> performance
> > of these processors is 282 GFLOPS, and my LINPACK performance isn't
> coming
> > close to that (I get approximately ~33% of that).  The number I often
> hear
> > mentioned is actual performance should be ~85%. of theoretical
> performance
> > is that a realistic number your experience?
> >
> > I don't want this to be a discussion of what could be wrong at this
> point,
> > we will get to that in future posts, I assure you!
> >
> > --
> > Prentice
> >
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