Ampere Altra Max 16MB LLC with 128 cores

By: Heikki Kultala (heikki.kul.tala.delete@this.gmail.com), May 25, 2021 10:22 pm
Room: Moderated Discussions
anon (anon.delete@this.ymous.org) on May 25, 2021 3:11 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?
>
> Well, if you sum L2 + SLC it is still 144MB of SRAM which is not that bad (but definitely behind
> the 256MB+ of some EPYC SKUs).

If we take into account L2 of Ampere, then we should count also L2 of the EPYCs so it's 144 MiB vs 288 MiBs total capacity.

But if we count total cache capacity available for any single thread, it's only 32.5 MiB vs 16 or 17 MiB.

> Definitely seems to be more of a shared victim cache than anything
> else. Maybe they're really good at making bypass decisions when evicting from L2 into LLC :)

I'm not sure it even is a victim cache. As it's called "system level cache" it might be a memory side cache which also caches accesses made by other accelerators and PCIe devices.
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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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