gpgpu

Article: Predicting AMD and Nvidia GPU Performance
By: Ian Ameline (ian.ameline.delete@this.(NoSpam).gmail.com), April 18, 2011 4:55 pm
Room: Moderated Discussions
Groo (charlie@semiaccurate.com) on 4/17/11 wrote:
---------------------------
>EduardoS (no@spam.com) on 4/17/11 wrote:
>---------------------------
>>>Here is another thing we don't know about gpgpu. How *reliable* are results calculated by gpgpu?
>>
>>If your code relies on 1+1=2 then it's very reliable.
>>
>>GPUs are deterministic, all integer operations will give the same results a CPU
>>would, fp operations may differ from CPU results, but the same input will always
>>return the same result up to (I hope for a doc quoting the value) a given precision,
>>if you don't rely on the bits beyond this point it's reliable.
>>
>I know the Evergreen (5xxx and 6000-6899) and NI/SI (6900-6999) shaders are currently
>fully IEEE FP compliant with one exception, and that is a certain type of interrupt
>handling. For numerical stuff, it is complete, for the programming side, that is the one problem.

Really?

*Fully* compliant? As in <= 1/2 ULP precision guarantees for add, subtract, divide, multiply *and* sqrt?

Denormal support?

+-0 and +- infinity correctly generated and handled?

I'm very skeptical.

-- Ian.
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TopicPosted ByDate
New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/12 12:55 AM
  Graph is not red-green colorblind friendly (NT)RatherNotSay2011/04/12 04:51 AM
    FixedDavid Kanter2011/04/12 09:46 AM
  New Article: Predicting GPU Performance for AMD and NvidiaJames2011/04/12 01:30 PM
    New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/12 03:51 PM
  Try HD6450 or HD6850EduardoS2011/04/12 04:31 PM
    Try HD6450 or HD6850David Kanter2011/04/13 11:25 AM
      Try HD6450 or HD6850EduardoS2011/04/13 04:20 PM
        of causeMoritz2011/04/14 09:03 AM
          of causeEduardoS2011/04/14 02:55 PM
            Barts = 5DMoritz2011/04/14 10:26 PM
              Barts = 5DAntti-Ville Tuunainen2011/04/15 01:38 AM
                Limiting fixed function unitsMoritz2011/04/15 05:28 AM
                  Limiting fixed function unitsVincent Diepeveen2011/04/20 03:38 AM
                    lack of detailMoritz2011/04/20 10:24 AM
                      lack of detailEduardoS2011/04/20 12:45 PM
            gpgpuVincent Diepeveen2011/04/16 03:10 AM
              gpgpuEduardoS2011/04/17 01:31 PM
                gpgpuGroo2011/04/17 01:58 PM
                  gpgpuEduardoS2011/04/17 02:08 PM
                  gpgpuIan Ameline2011/04/18 04:55 PM
                    gpgpuPing-Che Chen2011/04/19 01:59 AM
                      GPU numerical complianceSylvain Collange2011/04/19 12:38 PM
                        GPU numerical complianceVincent Diepeveen2011/04/20 03:17 AM
                gpgpuVincent Diepeveen2011/04/20 03:02 AM
                  gpgpu and core countsHeikki Kultala2011/04/20 05:41 AM
                    gpgpu and core countsVincent Diepeveen2011/04/20 06:52 AM
                      gpgpu and core countsnone2011/04/20 08:05 AM
                        gpgpu and core countsEduardoS2011/04/20 12:36 PM
                      gpgpu and core countsHeikki Kultala2011/04/20 11:16 AM
                        gpgpu and core countsEduardoS2011/04/20 12:34 PM
                          gpgpu and core countsHeikki Kultala2011/04/20 08:24 PM
                            gpgpu and core countsEduardoS2011/04/20 09:55 PM
                              gpgpu and core countsHeikki Kultala2011/04/21 07:48 AM
                                gpgpu and core countsEduardoS2011/04/22 02:41 PM
                              AMD Compute and Texture FetchDavid Kanter2011/04/21 11:42 AM
                                AMD Compute and Texture FetchVincent Diepeveen2011/04/22 02:14 AM
                                  AMD Compute and Texture FetchDavid Kanter2011/04/22 11:53 AM
                                AMD Compute and Texture FetchEduardoS2011/04/22 02:46 PM
                                  AMD Compute and Texture FetchDavid Kanter2011/04/22 03:02 PM
                                    AMD Compute and Texture FetchEduardoS2011/04/22 03:18 PM
                                    AMD Compute and Texture Fetchanon2011/04/22 04:30 PM
                                      AMD Compute and Texture FetchDavid Kanter2011/04/22 10:17 PM
                        gpgpu and core countsVincent Diepeveen2011/04/20 01:12 PM
                          gpgpu and core countsHeikki Kultala2011/04/21 11:23 AM
                            gpgpu and core countsVincent Diepeveen2011/04/22 03:11 AM
                              Keep the crazy politics out of thisDavid Kanter2011/04/22 09:39 AM
                                Keep the crazy politics out of thisVincent Diepeveen2011/04/22 10:12 AM
                                  Keep the crazy politics out of thisDavid Kanter2011/04/22 11:44 AM
                              gpgpu and core countsJouni Osmala2011/04/22 12:06 PM
                  gpgpuEduardoS2011/04/20 12:59 PM
                    gpgpuVincent Diepeveen2011/04/20 01:37 PM
                      gpgpuEduardoS2011/04/20 06:27 PM
                        gpgpuVincent Diepeveen2011/04/21 03:06 AM
                          gpgpuEduardoS2011/04/22 03:00 PM
  New Article: Predicting GPU Performance for AMD and NvidiaPiedPiper2011/04/12 11:05 PM
    New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/12 11:42 PM
      New Article: Predicting GPU Performance for AMD and NvidiaMS2011/04/15 06:04 AM
        New Article: Predicting GPU Performance for AMD and NvidiaKevin G2011/04/16 03:25 AM
          New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/16 09:42 AM
          New Article: Predicting GPU Performance for AMD and NvidiaVincent Diepeveen2011/04/20 03:20 AM
    memoryMoritz2011/04/14 10:03 PM
      memory - moreMoritz2011/04/16 12:11 AM
  New Article: Predicting GPU Performance for AMD and NvidiaKevin G2011/04/14 12:30 PM
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