Ampere Altra Max 16MB LLC with 128 cores

By: Rayla (rayla.delete@this.example.com), May 25, 2021 7:17 am
Room: Moderated Discussions
Doug S (foo.delete@this.bar.bar) on May 25, 2021 7:50 am wrote:
> 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?

AFAIK Altra Max shares a socket with Altra, so they were probably stuck with the peripherals they already had. I'm sure the next-gen part will be DDR5.
< Previous Post in ThreadNext Post in Thread >
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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