yes for GPU programming you need non-public info

Article: Computational Efficiency in Modern Processors
By: Potatoswatter (potswa_m.delete@this.c.com), November 11, 2009 1:26 pm
Room: Moderated Discussions
Vincent Diepeveen (diep@xs4all.nl) on 11/11/09 wrote:
---------------------------
>Potatoswatter (potswa_m@c.com) on 11/11/09 wrote:
>---------------------------
>>Vincent Diepeveen (diep@xs4all.nl) on 11/10/09 wrote:
>>---------------------------
>>>MoTheG (better@not.tell) on 11/9/09 wrote:
>>>---------------------------
>>>>a reader (a@b.c) on 11/9/09 wrote:
>>>>---------------------------
>>>>>stop blabbering.
>>>>>
>>>>>do you have access to GPU nda docs or not?
>>>>
>>>>I do not.
>>>>Does one have to?
>>>
>>>Yes of course,
>>
>>"Of course"? The point of any highly multithreaded machine is to shift the focus
>>from instruction latency to memory latency. NV gives a rough idea of the operations
>>and their latencies and a better idea of the memory architecture.
>
>Let's face it potatoswatter, the only successful software on GPU's right now has
>been programmed by NCSA type guys, be it the chinese organisation equivalent or
>the US version of it. Only those guys have lots of information that's not on the
>net, or have the tools and toys, and have them long before they ever got released.
>
>That's the reality.
>
>All other hard working amateurs at home, yes even total top coders, they all didn't
>manage to outperform quadcore hardware with ANY gpu; of course provided that their x86/x64 software was coded real well.

On what problem?

I generally agree with you. GPU hype is out of hand and SIMD+multicore is way underrated as a buzzword and an optimization platform.

But saying "0.2 IPC" without context is just as meaningless as their "200x speedup". On the face of it, NV doesn't claim (at least I'm not aware of a claim) their product to be suitable for problems where the number of threads is at all limited. IPC is a useless measure for an SMT multiprocessor designed to saturate an uncached memory channel. It's not a secret that full-width multiplication is slow, 0.25 IPC, on NV80. It's assumed that any developer accepts that and is prepared to fight it with ever-more threads.

As for the lack of successful CUDA programs, the learning curve to get them to work seems beyond all but the most tortured grad students. Then, the driver is too unstable and unfriendly for home use. Finally, serious development doesn't want to be tied to NV.

But on the other hand, the members of http://gpugrid.net would probably tell me to eat *my* words.
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TopicPosted ByDate
Article: Computational Efficiency in Modern Processors by DKMoTheG2009/11/08 07:02 AM
  Article: Computational Efficiency in Modern Processors by DKnone2009/11/08 07:15 AM
  Silverthorne and OoO vs. InOrdMoTheG2009/11/08 07:22 AM
    Silverthorne and OoO vs. InOrdDavid Kanter2009/11/08 04:11 PM
      Magical 100x speedupsAM2009/11/09 09:03 AM
        Magical 100x speedupsDavid Kanter2009/11/09 12:41 PM
          Magical 100x speedupsnone2009/11/09 01:36 PM
            Magical speedupsDavid Kanter2009/11/09 03:24 PM
              Magical speedupsnone2009/11/09 03:40 PM
              Hardware SpecsMS2009/11/09 05:49 PM
                44x faster than a single cpu coreVincent Diepeveen2009/11/10 08:17 AM
              Magical speedupsVincent Diepeveen2009/11/10 08:02 AM
          Xeon 130x speedup vs XeonEric Bron2009/11/10 08:20 AM
          Magical 100x speedupsAM2009/11/10 10:42 AM
            Magical 100x speedupsLinus Torvalds2009/11/10 01:19 PM
              Mega speedupsAM2009/11/11 06:21 AM
        Bogus 100x speedupsDavid Kanter2009/11/10 01:26 AM
          No speedups for CPUs for the general programming populaceMoTheG2009/11/10 05:26 AM
          Bogus 100x speedups?2009/11/10 05:45 AM
          Bogus 100x speedupshobold2009/11/10 07:31 AM
          Bogus 100x speedupsVincent Diepeveen2009/11/10 08:26 AM
          Bogus 100x speedupssylt2009/11/10 10:00 AM
          Bogus 100x speedupsAM2009/11/10 10:47 AM
      GPU vs. CPUMoTheG2009/11/09 11:30 AM
        GPU vs. CPUa reader2009/11/09 07:58 PM
          ease of programmingMoTheG2009/11/09 11:45 PM
            yes for GPU programming you need non-public infoVincent Diepeveen2009/11/10 08:36 AM
              yes for GPU programming you need non-public infoPotatoswatter2009/11/11 08:06 AM
                yes for GPU programming you need non-public infoVincent Diepeveen2009/11/11 11:23 AM
                  yes for GPU programming you need non-public infoPotatoswatter2009/11/11 01:26 PM
                  Real businesses use GPGPU.Jouni Osmala2009/11/11 11:00 PM
        GPU vs. CPU?2009/11/10 06:01 AM
          2. try but most is said, just clarifyingMoTheG2009/11/10 10:24 AM
            2. try but most is said, just clarifying?2009/11/11 01:11 AM
              you missread meMoTheG2009/11/12 12:33 AM
                you missread me?2009/11/12 01:18 AM
            2. try but most is said, just clarifyingPotatoswatter2009/11/11 08:22 AM
              2. try but most is said, just clarifying?2009/11/12 01:22 AM
                loose, not so orderlyMoTheG2009/11/12 12:47 PM
                  loose, not so orderlyPotatoswatter2009/11/12 06:50 PM
                2. try but most is said, just clarifyingrwessel2009/11/12 01:01 PM
                  2. try but most is said, just clarifyingGabriele Svelto2009/11/13 12:39 AM
                    2. try but most is said, just clarifying?2009/11/13 01:14 AM
                      2. try but most is said, just clarifyingGabriele Svelto2009/11/13 01:30 AM
                      2. try but most is said, just clarifyingrwessel2009/11/13 01:24 PM
                  2. try but most is said, just clarifyingMichael S2009/11/14 01:08 PM
                    2. try but most is said, just clarifyingGabriele Svelto2009/11/14 11:38 PM
                      2. try but most is said, just clarifyingAndi Kleen2009/11/15 01:19 AM
                      2. try but most is said, just clarifyingMichael S2009/11/15 01:58 AM
                        2. try but most is said, just clarifyingEric Bron2009/11/15 02:25 AM
                          /MP optionEric Bron2009/11/15 02:33 AM
                            /MP optionPaul2009/11/15 09:42 AM
                              /MP optionEric Bron2009/11/15 01:22 PM
                        2. try but most is said, just clarifying?2009/11/15 03:13 AM
                          2. try but most is said, just clarifyingMichael S2009/11/15 05:14 AM
                  2. try but most is said, just clarifyingEugene Nalimov2009/11/14 09:24 PM
    Atom pointAM2009/11/09 09:00 AM
      Atom TDPDavid Kanter2009/11/09 12:48 PM
        Atom TDPhobold2009/11/10 07:41 AM
        Atom TDPAM2009/11/10 10:49 AM
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