Hpcg is a memory benchmark, you should be sure to have good bindings for maximum memory throughput.
M On Wed, Aug 5, 2020, 11:07 AM Prentice Bisbal via Beowulf < beowulf@beowulf.org> wrote: > 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 > > _______________________________________________ > Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing > To change your subscription (digest mode or unsubscribe) visit > https://beowulf.org/cgi-bin/mailman/listinfo/beowulf >
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