Gromacs: Zen AVX2 vs AVX512 Larrabee

By: justcurious (justcurious.delete@this.mailinator.com), December 1, 2018 4:18 pm
Room: Moderated Discussions

ServeTheHome.com has published many Epyc vs Xeon Gold comparisons and one of their benchmark of choices is Gromacs, a simulation software heavily tuned for either AVX512 or AVX2. The win always goes to Intel as their cores have a dual AVX512 unit. But looking more closely to the benchmark results leads to a weird picture, to whit:
Intel Gold 6134: 8 cores, each with L2 1MB, L3 3MB+, 32 F64 ops per cycles (FMA), and sharing 3/4 of a memory port.
AMD Epyc 7601: 32 cores, each with L2 0.5MB, L3 2MB, 8 F64 ops per cycles and sharing 1/4 of a memory port.
Intel 8 * 32 = 32 * 8 AMD on the peak F64 per cycle.
The Intel runs at 2.7 GHZ under AVX512 while the AMD runs at 2.2 GHZ
In other words, the Intel cpu has better specs in every department and with the added advantage of running one fourth of the cores at a 500MHZ higher clock, the Xeon should crush the Epyc cpu at Gromacs.
And yet the Xeon scores 49.4, slightly below the Epyc cpu at 49.5.
On frequency alone the Xeon score should be above 60 if it had the same efficiency (Gromacs / flops) as the Epyc cpu, so this begs the question: Is the AVX512 worth its weight in transistors and infrastructure support?
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TopicPosted ByDate
Gromacs: Zen AVX2 vs AVX512 Larrabeejustcurious2018/12/01 04:18 PM
  Gromacs: Zen AVX2 vs AVX512 LarrabeeTravis Downs2018/12/01 05:09 PM
    Gromacs: Zen AVX2 vs AVX512 LarrabeeDomaldel2018/12/01 09:54 PM
      Gromacs: Zen AVX2 vs AVX512 LarrabeeTravis Downs2018/12/02 05:59 PM
        Thank you for the explaination, that helped a lot. =) (NT)Domaldel2018/12/03 04:13 AM
          SPEC2017fp_ratePer Hesselgren2018/12/03 05:49 AM
            SPEC2017fp_rateanon.12018/12/03 08:16 PM
    Gromacs: Zen AVX2 vs AVX512 Larrabeejustcurious2018/12/02 02:03 AM
      Gromacs: Zen AVX2 vs AVX512 LarrabeePer Hesselgren2018/12/02 03:41 AM
        Gromacs: Zen AVX2 vs AVX512 Larrabee-.-2018/12/02 05:37 PM
          Gromacs: Zen AVX2 vs AVX512 Larrabeeanon2018/12/03 03:09 AM
      Gromacs: Zen AVX2 vs AVX512 LarrabeeTravis Downs2018/12/02 06:05 PM
        Gromacs: Zen AVX2 vs AVX512 Larrabeejustcurious2018/12/02 07:53 PM
          Gromacs: Zen AVX2 vs AVX512 Larrabeehobel2018/12/03 12:26 AM
            Gromacs: Zen AVX2 vs AVX512 LarrabeeKevin G2018/12/03 12:58 AM
              Gromacs: Zen AVX2 vs AVX512 Larrabeenone2018/12/03 01:17 AM
                Gromacs: Zen AVX2 vs AVX512 LarrabeeMichael S2018/12/03 04:04 AM
                Gromacs: Zen AVX2 vs AVX512 LarrabeeKevin G2018/12/03 10:34 AM
                  Gromacs: Zen AVX2 vs AVX512 LarrabeeDavid Hess2018/12/04 06:04 AM
              Gromacs: Zen AVX2 vs AVX512 LarrabeeMichael S2018/12/03 03:59 AM
            Gromacs: Zen AVX2 vs AVX512 Larrabeej2018/12/03 01:49 AM
              Gromacs: Zen AVX2 vs AVX512 Larrabeeanonymou52018/12/03 07:20 AM
                Gromacs: Zen AVX2 vs AVX512 Larrabeej2018/12/03 09:56 AM
            Gromacs: Zen AVX2 vs AVX512 LarrabeeMaynard Handley2018/12/03 01:26 PM
              Gromacs: Zen AVX2 vs AVX512 Larrabeeanonymous22018/12/04 01:26 PM
          Gromacs: Zen AVX2 vs AVX512 LarrabeeTravis Downs2018/12/03 07:36 PM
            Gromacs: Zen AVX2 vs AVX512 LarrabeeMaynard Handley2018/12/03 08:26 PM
              Gromacs: Zen AVX2 vs AVX512 LarrabeeAdrian2018/12/03 10:21 PM
                Gromacs: Zen AVX2 vs AVX512 Larrabeeanon.12018/12/04 09:32 PM
                  Gromacs: Zen AVX2 vs AVX512 LarrabeeAdrian2018/12/04 10:52 PM
  Gromacs: Zen AVX2 vs AVX512 Larrabeejuanrga2018/12/02 08:56 AM
    Gromacs: Zen AVX2 vs AVX512 Larrabeehobel2018/12/03 02:40 AM
      Gromacs: Zen AVX2 vs AVX512 LarrabeeMichael S2018/12/03 05:32 AM
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