KNL obsolete, AVX512 - a huge mistake

By: Michael S (already5chosen.delete@this.yahoo.com), August 26, 2015 6:43 am
Room: Moderated Discussions
NoSpammer (no.delete@this.spam.com) on August 26, 2015 6:33 am wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on August 26, 2015 4:23 am wrote:
> > As to mentioning AVX-1024 for current hardware, that's the whole point! They should (IMHO)
> > have skipped AVX512 completely and to jump straight from AVX256 to at least AVX1024.
>
> It's understandable that Intel was trying to be pragmatic here
> and match the cache line size of the mainstream CPUs.
>
> > Personally, I'd prefer even wider registers (4096 bit sounds about right) with exactly the same ISA
> > supported over all market segments with varying width of actual execution units. Something like 64b
> > DP/128b SP execution units on phones/tablets, 256b DP/SP on mainstream laptop/desktop/E3s, either
> > 128b or 256b on E5/E7, 1024b DP/SP on HPC parts, 1024b DP/2048b SP on imaging/military parts.
> > However, if all we are looking for is an HPC competitor for Maxwell-based Teslas, then straight-forward
> > 1024-bit registers backed by 1024-bit execution units will do the trick.
>
> If 1024-bit execution is such a perfect sweet spot then two
> 512-bit execution units will do the trick, too, won't they?

No, in order to much Maxwell-based Tesla in dick measuring contest DP LINPACK at low frequency and with sane # of cores one needs both a pair of FMA pipes and 1024-bit execution width on each of them.
< Previous Post in ThreadNext Post in Thread >
TopicPosted ByDate
KNL obsolete, AVX512 - a huge mistakeMichael S2015/08/25 02:58 PM
  KNL obsolete, AVX512 - a huge mistakeMark Roulo2015/08/25 04:10 PM
    KNL obsolete, AVX512 - a huge mistakeMichael S2015/08/25 04:23 PM
  KNL obsolete, AVX512 - a huge mistakejuanrga2015/08/25 06:01 PM
    KNL obsolete, AVX512 - a huge mistakeAnon2015/08/26 01:23 AM
      KNL obsolete, AVX512 - a huge mistakejuanrga2015/08/26 05:49 AM
        KNL obsolete, AVX512 - a huge mistakeAlberto2015/08/26 06:26 AM
          KNL obsolete, AVX512 - a huge mistakejuanrga2015/08/26 11:23 AM
            KNL obsolete, AVX512 - a huge mistakeAlberto2015/08/26 01:13 PM
    KNL obsolete, AVX512 - a huge mistakeAaron Spink2015/08/26 07:25 AM
      KNL obsolete, AVX512 - a huge mistakejuanrga2015/08/26 12:11 PM
  Core M vs Atom- well duhAnon2015/08/26 01:19 AM
    Core M vs Atom- well duhMichael S2015/08/26 02:59 AM
      Core M vs Atom- well duhAnon2015/08/26 03:37 AM
  KNL obsolete, AVX512 - a huge mistakebakaneko2015/08/26 03:44 AM
    KNL obsolete, AVX512 - a huge mistakeMichael S2015/08/26 04:23 AM
      KNL obsolete, AVX512 - a huge mistakebakaneko2015/08/26 05:01 AM
        KNL obsolete, AVX512 - a huge mistakeMichael S2015/08/26 05:13 AM
          KNL obsolete, AVX512 - a huge mistakebakaneko2015/08/26 06:00 AM
      KNL obsolete, AVX512 - a huge mistakeNoSpammer2015/08/26 06:33 AM
        KNL obsolete, AVX512 - a huge mistakeMichael S2015/08/26 06:43 AM
  KNL obsolete, AVX512 - a huge mistakempx2015/08/31 03:15 AM
  KNL obsolete, AVX512 - a huge mistakePassing Through2018/08/03 11:02 AM
  KNL obsolete, AVX512 - a huge mistakecoppice2018/08/04 04:34 AM
    KNL obsolete, AVX512 - a huge mistakePassing Through2018/08/04 06:58 AM
Reply to this Topic
Name:
Email:
Topic:
Body: No Text
How do you spell avocado?