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Comparing CPUs based on multiplying the Thread Count by the Single Thread Rating

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  • Comparing CPUs based on multiplying the Thread Count by the Single Thread Rating

    Hi there,

    let's assume we are in a truly multi-threaded workload, running multiple VMs or containers running on the same machine.


    AMD EPYC 7401P
    - https://www.cpubenchmark.net/cpu.php...+7401P&id=3118
    - with 24 Cores / 48 Threads
    - an average CPU mark of 19555
    - and a Single Thread Rating of 1488

    Intel Xeon E3-1271 v3
    - https://www.cpubenchmark.net/cpu.php....60GHz&id=2334
    - with 4 Cores / 8 Threads
    - an average CPU mark of 10089
    - and a Single Thread Rating of 2270


    According to the CPU marks from above 1x AMD EPYC 7401P machine would perform roughly the same as 2x Intel Xeon E3-1271 v3 machines.

    But doesn't it make more sense to compare the two by multiplying the Thread Count by the Single Thread Rating for the given workload?

    AMD EPYC 7401P = 48*1488 = 71424
    Intel Xeon E3-1271 v3 = 8* 2270 = 18160

    In that case 1x AMD EPYC 7401P machine would perform roughly four times as fast as 1x Intel Xeon E3-1271 v3 machine.

    To me this makes a whole lot more sense but is it correct?


    Thanks,
    humbug

  • #2
    No, by doing this you are assuming perfect scaling of a single thread to 48+ threads.
    Very few algorithms get even close to perfect scaling. Thermal issues, system bottlenecks (memory bus & NUMA) and the algorithms themselves prevent perfect scaling.

    Comment


    • #3
      I see, thanks David!

      Comment

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