[Beowulf] AMD and AVX512

Carlos Bederián carlos.bederian at unc.edu.ar
Wed Jun 16 17:52:59 UTC 2021

On Wed, Jun 16, 2021 at 2:16 PM Prentice Bisbal via Beowulf <
beowulf at beowulf.org> wrote:

> Last fall I evaluated potential new cluster nodes for a large cluster
> purchase using the HPL benchmark. I compared a server with dual AMD EPYC
> 7H12 processors (128) cores to a server with quad Intel Xeon 8268
> processors (96 cores). I measured 5,389 GFLOPS for the Xeon 8268, and
> only 3,446.00 GFLOPS for the AMD 7H12. That's LINPACK score that only
> 64% of the Xeon 8268 system, despite having 33% more cores.

Most of the workloads we see on our clusters have arithmetic intensities
much lower than LINPACK's, so all that extra compute gets starved by lack
of memory bandwidth.
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