[Beowulf] Theoretical vs. Actual Performance

[Michael Di Domenico]

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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