Hi Richard, On Fri, Aug 14, 2020 at 2:30 PM Richard Walsh <[email protected]> wrote: > What have people achieved on this SKU on a single-node using the stock > HPL 2.3 source... ??
I got similar findings as yours, about 75-80% of peak, albeit using a different SKU (7702), but consistent over multiple platforms (thus hopefully averaging manufacturer idiosyncrasies). I think this page summarizes the most relevant BIOS settings pretty well: https://hpcadvisorycouncil.atlassian.net/wiki/spaces/HPCWORKS/pages/1280442391/AMD+2nd+Gen+EPYC+CPU+Tuning+Guide+for+InfiniBand+HPC#Configurable-Thermal-Design-Power-(cTDP) > I have seen a variety of performance claims even as high as 90% of its > nominal per node peak of 4.608 TFLOPs. Interestingly, the theoretical performance of a dual-7742 machine is 4.608 TFLOPs, at *base* clock (2.25 GHz). In practice, you probably had Turbo on, meaning that the clocks were probably running closer to the 3.0 GHz range, which means that the theoretical performance should be in the 6 TF range, hence bringing the observed efficiency even lower. An interesting test would be to disable Turbo to fix the core clocks at 2.25 GHz, and see the HPL numbers you get. Cheers, -- Kilian _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit https://beowulf.org/cgi-bin/mailman/listinfo/beowulf
