[Beowulf] Theoretical vs. Actual Performance
pbisbal at pppl.gov
Thu Feb 22 14:27:27 PST 2018
So I just rebuilt HPL using the ACML 6.1.0 libraries with GCC 6.1.0, and
I'm now getting 197 GFLOPS, so clearly there's a problem with my
OpenBLAS build. I'm going to try building OpenBLAS without the dynamic
arch support on the machine where I plan on running my tests, and see if
that version of the library is any better.
On 02/22/2018 09:37 AM, Prentice Bisbal wrote:
> 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!
More information about the Beowulf