Ampere Altra Max 16MB LLC with 128 cores

By: Doug S (foo.delete@this.bar.bar), May 25, 2021 6:50 am
Room: Moderated Discussions
Ganon (anon.delete@this.gmail.com) on May 25, 2021 1:30 am wrote:
> https://amperecomputing.com/wp-content/uploads/2021/05/Altra_Max_PB_v0.55_20210514.pdf
>
> 128 cores with 16MB seems small; esp when compared to what amd rome/milan is providing. Obviously
> this is targeting only certain workloads (minimal sharing/small per thread working set).
>
> Any thoughts?


The biggest thing that jumped out at me when I read about it was going from 32MB to 16MB SLC. Did they sacrifice cache area to add more cores? They only gained 32% increased performance from 60% more cores in SPECrate 2017_int_base which is as embarrassingly parallel as workloads can get, so clearly they are running into some not insignificant scaling issues. If the issue is maxing out memory bandwidth, why not add more memory controllers or go with DDR5 this time?
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TopicPosted ByDate
Ampere Altra Max 16MB LLC with 128 coresGanon2021/05/25 12:30 AM
  Ampere Altra Max 16MB LLC with 128 coresanon2021/05/25 02:11 AM
    Ampere Altra Max 16MB LLC with 128 coresHeikki Kultala2021/05/25 10:22 PM
      Ampere Altra Max 16MB LLC with 128 coresAnon2021/05/26 12:36 PM
        Ampere Altra Max 16MB LLC with 128 coresChester2021/05/26 01:54 PM
          Ampere Altra Max 16MB LLC with 128 coresChester2021/05/26 02:03 PM
  Ampere Altra Max 16MB LLC with 128 coresDoug S2021/05/25 06:50 AM
    Ampere Altra Max 16MB LLC with 128 coresAndrei F2021/05/25 07:06 AM
    Ampere Altra Max 16MB LLC with 128 coresRayla2021/05/25 07:17 AM
  A few thoughts on Ampere's Altra MaxPaul A. Clayton2021/05/27 11:00 AM
    A few thoughts on Ampere's Altra MaxBjörn Ragnar Björnsson2021/05/27 02:47 PM
      Yeah, I should have looked for and through a data sheet (NT)Paul A. Clayton2021/05/27 05:25 PM
    A few thoughts on Ampere's Altra MaxAdrian2021/05/27 10:13 PM
      Boring can be profitablePaul A. Clayton2021/05/29 11:18 AM
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