[Beowulf] Register article on Epyc

[Mikhail Kuzminsky]

Returning to the first message:
> Also regarding compute power, it would be interesting to see a comparison
> of a single socket of these versus Xeon Phi rather than -v4 or -v5 Xeon.

I partially disagree w/general discussion direction. AMD Epyc looks as excellent CPUs for datacenters. But if we say about Beowulf and HPC, we must start 1st of all not from SPECfp_rate, but simple from FLOPS per cycle for core, or somes like Linpack, dgemm or like other tests.

OK, it's known that Zen core support AVX2 only via 128 bits base, and gives only 8 DP FLOPS per cycle (see
http://www.linleygroup.com/mpr/article.php?id=11666
or
https://www.hotchips.org/wp-content/uploads/hc_archives/hc28/HC28.23-Tuesday-Epub/HC28.23.90-High-Perform-Epub/HC28.23.930-X86-core-MikeClark-AMD-final_v2-28.pdf

Broadwell core gives 16 FLOPS/cycle, and Skylake-SP 32 FLOPS/cycle w/AVX512. Therefore SPECfp_rate2006 may be good for Epyc 7601 because of 32 cores per CPU instead of 22 cores for Broadwell Xeon E5-2699A v4. Xeon Phy KNL cores also gives 32 DP FLOPS per cycle. By my opinion, it's necessary to wait results of normal HPC tests. 

Mikhail Kuzminsky
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