VR-ZONE KNC B0 leak, poor number?

Article: Computational Efficiency for CPUs and GPUs in 2012
By: EBFE (x.delete@this.y.com), August 4, 2012 5:37 am
Room: Moderated Discussions
Eric (eric.kjellen.delete@this.gmail.com) on August 3, 2012 7:59 am wrote:
> EBFE (x.delete@this.y.com) on August 3, 2012 1:57 am wrote:
> > David Kanter
> (dkanter.delete@this.realworldtech.com) on July 26, 2012 9:31 am
> >
> wrote:
> > > > > > What is the
> > > > > >
> >
> > > >
> > currently best ratio of
> > > GPU to
> > >
> > CPU?
> > > > >
> > >
> > > > That depends on your
> workload.
> > > >
> > > >
> > > >
> > > >
>
> > > > > Will
> > > > the best future design be a
> >
> >
> >
> > > > > > BlueGene/Q (for best I/O) driving an
>
> > > >
> > >
> > > > optimum
> > > number of GPUs
> (for best Compute)?
> > > > >
> >
> > > > > If you
> look at
> > >
> > > > the chart, it
> > > >
> > >
> should be clear that BGQ stands alone and
> > > doesn't need
> > >
> >
> > GPUs. From a power
> > > > > perspective, it's superior
> to
> > > all
> > existing GPUs - and
> > > > it can run a far
> wider
> > > > > range of
> >
> > > workloads.
> > >
> > >
> > > > > David
> > > >
> > > >
> >
> BGQ is
> > > > about the
> > > same as 3GiB HD7970(947G/250W). So
> BGQ is
> > quite likely to be inferior
> > > > to
> > > a 6GiB
> incoming-gen
> > Firestream.
> > > > [If I recall correctly, at
> launch time AMD
> > >
> > >
> > > listed 7970 GPU/board power
> as 210/250]
> > >
> > > I expect that the next
> >
> > >
> generation of throughput processors (Knights Corner, Tahiti, Kepler) will
> >
>
> > > significantly alter the landscape because they represent a jump in
>
> > >
> > process.
> > >
> > > For AMD and Nvidia it is 40nm
> to 28nm, and for Intel it is
> > the move
> > > to 22nm.
> > >
>
> > > DK
> > ow">
> >
> http://vr-zone.com/articles/intel-xeon-phi-b0-stepping--the-knight-in-shin
> >
> ing-armor-/16871.html

> > (if not fake) Looks pretty bad: low freq, small ram,
> high
> > tdp
> > The number is so bad that I tend to think it's fake.
>
> Why
> do you think that? Assuming that the top clock frequencies can actually be
> sustained, it's 8 DP FLOP (512-bit vector unit) * 2 (FMA?) * 60 * 1.09 GHz =
> 1.046 TFLOPS. That's in line with the 1 DP TFLOPS that Knights Corner was
> reported to clock in at in DGEMM/LINPACK. TDP and RAM look OK.

Linpack TFlops/300W is likely to defeat next Firestream on perf and perf/w, or even next Fermi by perf.

However, I am assuming the following disadvantage, so I was expecting more flops and flops/W.
1. Coding for a target performance level is harder for KNC than GPU.
KNC has to close the gap of low raw flops by significantly higher effciency, which could be impossible or make coding harder.
2. KNC is more expensive than GPU. (SNB-EP is already near $2k)
3. On-borad RAM is smaller than competition, which may lower real efficiency.
4. SP performance is incompetent.
4.5 KNC trails GPU in some GPU-favorable workloads.(e.g. where GPUs are used for now)
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New Article: Compute Efficiency 2012David Kanter2012/07/25 12:37 AM
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        GCN - TFLOP DPKevin G2012/08/11 04:22 PM
      GCN - TFLOP DPEric2012/08/09 04:12 PM
        GCN - TFLOP DPjp2012/08/10 12:23 AM
          GCN - TFLOP DPEBFE2012/08/12 07:27 PM
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      New Article: Compute Efficiency 2012EBFE2012/07/26 01:27 AM
        BG/QDavid Kanter2012/07/26 08:31 AM
          VR-ZONE KNC B0 leak, poor number?EBFE2012/08/03 12:57 AM
            VR-ZONE KNC B0 leak, poor number?Eric2012/08/03 06:59 AM
              VR-ZONE KNC B0 leak, poor number?EBFE2012/08/04 05:37 AM
                VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/04 05:51 PM
                Leaks != productsDavid Kanter2012/08/05 02:19 AM
                  Leaks != productsEBFE2012/08/06 01:49 AM
                VR-ZONE KNC B0 leak, poor number?Eric2012/08/05 09:37 AM
                  VR-ZONE KNC B0 leak, poor number?EBFE2012/08/06 02:09 AM
                    VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/06 03:33 AM
                      VR-ZONE KNC B0 leak, poor number?jp2012/08/07 02:08 AM
                        VR-ZONE KNC B0 leak, poor number?Eric2012/08/07 03:58 AM
                          VR-ZONE KNC B0 leak, poor number?jp2012/08/07 04:17 AM
                            VR-ZONE KNC B0 leak, poor number?Eric2012/08/07 04:22 AM
                              VR-ZONE KNC B0 leak, poor number?anonymou52012/08/07 08:43 AM
                            VR-ZONE KNC B0 leak, poor number?jp2012/08/07 04:23 AM
                              VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/07 06:24 AM
                        VR-ZONE KNC B0 leak, poor number?aaron spink2012/08/07 06:20 AM
                          VR-ZONE KNC B0 leak, poor number?jp2012/08/07 10:22 AM
                            VR-ZONE KNC B0 leak, poor number?EduardoS2012/08/07 02:15 PM
                        KNC has FMADavid Kanter2012/08/07 08:17 AM
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      Best case for GPUsfranzliszt2012/07/25 12:39 PM
      Best case for GPUsChuck2012/07/25 07:13 PM
        Best case for GPUsDavid Kanter2012/07/25 08:45 PM
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  Silverthorn data pointMichael S2012/07/25 01:45 PM
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  New Article: Compute Efficiency 2012Unununium2012/07/25 04:55 PM
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      Ops... I'm wrong...EduardoS2012/07/25 07:14 PM
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    Line and factorPeter Boyle2012/07/27 06:57 AM
      not entirelyMoritz2012/07/27 11:22 AM
      Line and factorEduardoS2012/07/27 04:24 PM
        Line and factorMoritz2012/07/28 11:52 AM
  tables Michael S2012/07/26 01:39 AM
  Interlagos L2+L3Rana2012/07/26 02:13 AM
    Interlagos L2+L3Rana2012/07/26 02:13 AM
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        SP vs DP & performance metricsEric2012/07/27 06:57 AM
          SP vs DP & performance metricsjp2012/07/27 08:18 AM
            SP vs DP & performance metricsaaron spink2012/07/27 08:36 AM
              SP vs DP & performance metricsjp2012/07/27 08:47 AM
                "Global" --> systemPaul A. Clayton2012/07/27 09:31 AM
                  "Global" --> systemjp2012/07/27 02:55 PM
                    "Global" --> systemaaron spink2012/07/27 06:33 PM
                      "Global" --> systemjp2012/07/28 01:00 AM
                        "Global" --> systemaaron spink2012/07/28 05:54 AM
                          "Global" --> systemjp2012/07/29 01:12 AM
                            "Global" --> systemaaron spink2012/07/29 04:03 AM
                              "Global" --> systemnone2012/07/29 08:05 AM
                                "Global" --> systemEduardoS2012/07/29 09:26 AM
                                "Global" --> systemjp2012/07/30 01:24 AM
                                  "Global" --> systemaaron spink2012/07/30 02:05 AM
                                "Global" --> systemaaron spink2012/07/30 02:03 AM
                                  daxpy is STREAM TRIADPaul A. Clayton2012/07/30 05:10 AM
                SP vs DP & performance metricsaaron spink2012/07/27 06:25 PM
                  SP vs DP & performance metricsEmil Briggs2012/07/28 05:40 AM
                    SP vs DP & performance metricsaaron spink2012/07/28 06:05 AM
                      SP vs DP & performance metricsjp2012/07/28 10:04 AM
                        SP vs DP & performance metricsBrett2012/07/28 02:32 PM
                      SP vs DP & performance metricsEmil Briggs2012/07/28 05:11 PM
                        SP vs DP & performance metricsanon2012/07/29 01:53 AM
                        SP vs DP & performance metricsaaron spink2012/07/29 04:39 AM
                          Coherency for discretesRohit2012/07/29 08:24 AM
                          SP vs DP & performance metricsanon2012/07/29 10:09 AM
                          SP vs DP & performance metricsEric2012/07/29 12:08 PM
        SP vs DP & performance metricsaaron spink2012/07/27 08:25 AM
  Regular updates?Joe2012/07/27 08:35 AM
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            Memory power and bandwidth?David Kanter2012/08/04 10:22 AM
              Memory power and bandwidth?Michael S2012/08/04 01:36 PM
              Memory power and bandwidth?Iain McClatchie2012/08/06 01:09 PM
              Memory power and bandwidth?Eric2012/08/07 05:28 PM
                WorkloadsDavid Kanter2012/08/08 09:49 AM
                  WorkloadsEric2012/08/09 04:21 PM
                Latency and bandwidth bottlenecks Paul A. Clayton2012/08/08 03:02 PM
                  Latency and bandwidth bottlenecks Eric2012/08/09 04:32 PM
                    Latency and bandwidth bottlenecks none2012/08/10 05:06 AM
                  Latency and bandwidth bottlenecks -> BDPajensen2012/08/11 02:21 PM
            Memory power and bandwidth?Ingeneer2012/08/06 10:26 AM
  NV aims for 1.8+ TFLOPS DP ?jp2012/08/11 12:21 PM
    NV aims for 1.8+ TFLOPS DP ?David Kanter2012/08/11 08:25 PM
      NV aims for 1.8+ TFLOPS DP ?jp2012/08/12 01:45 AM
      NV aims for 1.8+ TFLOPS DP ?EBFE2012/08/12 09:02 PM
        NV aims for 1.8+ TFLOPS DP ?jp2012/08/13 12:54 AM
          NV aims for 1.8+ TFLOPS DP ?Gabriele Svelto2012/08/13 08:16 AM
            NV aims for 1.8+ TFLOPS DP ?Vincent Diepeveen2012/08/14 02:04 AM
          NV aims for 1.8+ TFLOPS DP ?David Kanter2012/08/13 08:50 AM
            NV aims for 1.8+ TFLOPS DP ?jp2012/08/13 10:17 AM
        NV aims for 1.8+ TFLOPS DP ?EduardoS2012/08/13 05:45 AM
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