[Beowulf] Theoretical vs. Actual Performance

Prentice Bisbal 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:
> 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!

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