[Beowulf] ***UNCHECKED*** HPCG

Jan Wender j.wender at web.de
Thu Aug 6 12:32:51 PDT 2020


Hi Prentice,

If all you want to compare is the performance of one CPU, then you could use the SPEC benchmarks, SPECint and SPECfp. Both are available for many CPUs at spec.org. Source is unfortunately only accessible for SPEC members. 

Best, Jan
-- 
Jan Wender - j.wender at web.de

> Am 05.08.2020 um 20:09 schrieb Prentice Bisbal via Beowulf <beowulf at beowulf.org>:
> 
> ´╗┐Beowulfers,
> 
> Do any of you have any experience using HPCG as a benchmark. I'm trying to compare the performance of several different processors for an upcoming purchase. I've already run LINPACK, and now I'd like to run HPCG. It seems the only tuning parameter is the size of the local grid in the x,y,z dimensions.
> 
> While the guidelines say to increase the gridsize until the job consumes 1/4 or more of RAM, my testing has shown that as the gridsize goes up, so does the performance,  and it keeps going up for me until I consume all the memory and the job gets killed by Slurm for exceeding memory requirements.
> 
> I've been doing a lot of Google searching for how to tune HPCG for maximum results, and there are some papers for tuning HPCG for large supercomputers. In these cases, they use x,y,z dimensions that are not necessarily equal, but I don't understand how they determined to use these unique values for x,y,z.
> 
> When I compare my HPL results to my HPCG results, I'm getting HPCG results that are 0.3 - 0.5% of HPL. On the HPCG Top500 list, most systems are getting 2-3% of HPL, so I'm off by an order of magnitude.
> 
> -- 
> Prentice
> 
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