The Top500 has been listing wrong Rpeak values for most clusters for many years now, so I wouldn't dwell on it...
Take a Skylake-based cluster like Frontera. Its listed Rpeak is 38,745.9 TFLOPS = 8008 nodes * 56 cores * 32 ops/cycle * 2.7GHz. But 2.7GHz is the regular base frequency, and to do 32 ops/cycle you need to use AVX-512. All-core AVX-512 frequencies for a Xeon 8280 are 1.8GHz base and 2.4GHz turbo, so the Rpeak is off by 12-33%. On Thu, Jun 3, 2021 at 9:22 AM harsh_google lastname < harshscience...@gmail.com> wrote: > But that wouls bring the theoretical performance to 160 TFLOPS per box, > which also doesn't match! > > On Thu, Jun 3, 2021, 5:50 PM Carlos Bederián <carlos.beder...@unc.edu.ar> > wrote: > >> A100 does 19.5 FP64 TFLOPS using tensor cores. >> >> On Thu, Jun 3, 2021 at 9:08 AM harsh_google lastname < >> harshscience...@gmail.com> wrote: >> >>> I am calculating the theoretical peak (FP64) performance of the Nvidia >>> DGX A100 system. >>> >>> Now, A100 datasheet lists FP64 performance to be 9.7 TFLOPS. >>> Two AMD 7742 CPUs will give 128 cores x 2.25 GHz base clock x 16 FP64 >>> ops / cycle = 4.6 TFLOPS. >>> This gives a total of 82.2 TFLOPS per DGX-A100. >>> >>> Here is my problem. For any system with DGX A100 on top500.org, numbers >>> just don't add up. For eg: Selene has 560 DGX boxes, but its theoretical >>> peak is listed as 79.2 PFLOPS, whereas I expect it should be 46 PFLOPS (ie >>> 82.2 TFLOPS x560). The same is true for any other DGX based system listed >>> on top500. What am I missing here? >>> >>> Thanks! >>> >>> Harsh Hemani >>> _______________________________________________ >>> 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 >>> >>
_______________________________________________ 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
