KNL obsolete, AVX512 - a huge mistake

By: Michael S (already5chosen.delete@this.yahoo.com), August 25, 2015 4:23 pm
Room: Moderated Discussions
Mark Roulo (nothanks.delete@this.xxx.com) on August 25, 2015 4:10 pm wrote:
> Michael S (already5chosen.delete@this.yahoo.com) on August 25, 2015 2:58 pm wrote:
> > Afterthoughts of Core-M vs Cherry Trail comparison.
> >
> > Until yesterday I didn't look at Intel Core-M and Cherry Trail too closely, but yesterday I did.
> > And what I saw? Top of the line Core-M (M-5Y71) is better than top of the
> > line Cherry Trail (x7-Z8700) in every single aspect except selling price:
> >
> > Single Threaded Performance - ALOT better
> > Graphics - ALOT better
> > Multithreaded FP - ALOT better
> > These two were expected
> > What I didn't expect is that Core-M is also significantly ahead in multithreaded Integer tests. So
> > far ahead that it seems that multithreaded Integer performance per Watt is likely about equal.
> >
> > Jumping from mobile to HPC.
> > It means that it was very possible, and may be still possible for Intel to base their GPGPU competitor on
> > Sandy Bridge derivative. Probably, not exactly Broadwell and not exactly Skylake, but slightly different
> > 14nm core. Tuned for 2.5-3 GHz operation instead of 4 GHz,
> > probably same number of execution ports as sandyB,
> > less aggressive bypasses, less agressive divide units etc...
> > In short, slightly compromised absolute performance
> > relatively to Broadwell and Skylake, but almost the same
> > performance per Watt at low frequency and at 20-30%
> > smaller area. Now let's put 33 such cores running at 1.4/2.6 GHz (Base/Turbo) on a single huge die. Or, may
> > be, if it fits, 39 cores with Base=1.2 GHz. Or somthing in the middle, you got the idea.
> > Just like in the case of Core-M vs Cherry Trail we will get ALOT better (than KNL) single threaded
> > performance, ALOT better scalar multithreaded FP and about the same multithreaded integer at about
> > the same power envelop. Now, you are asking: "Who cares? this thing are important for smart customers,
> > but the whole point of KNL is pleasing stupid customers by showing them that we can run LINPACK as
> > fast the biggest baddest Maxwell and than slightly faster yet! You variant is not even close!".
> > And here you understood why AVX512 is a huge mistake. Core-based
> > GPGPU killer absolutely needs AVX-1024. Or wider.
>
> Knights Landing gets ~6 TFLOPS single precision.
>
> How do you get this from 33 SandyBridge cores running at 1.4 GHz?

33 * 1.4 * 2 units * 2 (FMA) * 32 lanes
< 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
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