gpgpu

Article: Predicting AMD and Nvidia GPU Performance
By: Ping-Che Chen (pcchen.delete@this.kimicat.com), April 19, 2011 12:59 am
Room: Moderated Discussions
Ian Ameline (ian.ameline@(NoSpam).gmail.com) on 4/18/11 wrote:
---------------------------
>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.
>

Right now, OpenCL 1.1 requires basically the following:

1. round to nearest even, other rounding modes are optional. Dynamic rounding mode selection is not supported.
2. INF and (non signaling) NaN must be supported.
3. Denormalized number is optional.
4. No exception handling is supported right now.
5. +, -, * must be infinitely precise. Division and sqrt are not required to be infinitely precise.

In the case of newer NVIDIA devices (2.x in CUDA):

1. All four rounding modes are supported for most operations, but only static (no dynamic selection).
2. INF and (non signaling) NaN is supported (but absolute and negation of NaN are not conforming)
3. Denormalized number is supported for both single precision and double precision (only double precision in 1.x devices).
4. +, -, * are infinitely precise. Div and sqrt can be made infinitely precise through compiler options (for single precision only, double precision is always infinitely precise).
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TopicPosted ByDate
New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/11 11:55 PM
  Graph is not red-green colorblind friendly (NT)RatherNotSay2011/04/12 03:51 AM
    FixedDavid Kanter2011/04/12 08:46 AM
  New Article: Predicting GPU Performance for AMD and NvidiaJames2011/04/12 12:30 PM
    New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/12 02:51 PM
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      Try HD6450 or HD6850EduardoS2011/04/13 03:20 PM
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          of causeEduardoS2011/04/14 01:55 PM
            Barts = 5DMoritz2011/04/14 09:26 PM
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                Limiting fixed function unitsMoritz2011/04/15 04:28 AM
                  Limiting fixed function unitsVincent Diepeveen2011/04/20 02:38 AM
                    lack of detailMoritz2011/04/20 09:24 AM
                      lack of detailEduardoS2011/04/20 11:45 AM
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                        GPU numerical complianceVincent Diepeveen2011/04/20 02:17 AM
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                      gpgpu and core countsHeikki Kultala2011/04/20 10:16 AM
                        gpgpu and core countsEduardoS2011/04/20 11:34 AM
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                            gpgpu and core countsVincent Diepeveen2011/04/22 02:11 AM
                              Keep the crazy politics out of thisDavid Kanter2011/04/22 08:39 AM
                                Keep the crazy politics out of thisVincent Diepeveen2011/04/22 09:12 AM
                                  Keep the crazy politics out of thisDavid Kanter2011/04/22 10:44 AM
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  New Article: Predicting GPU Performance for AMD and NvidiaPiedPiper2011/04/12 10:05 PM
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      New Article: Predicting GPU Performance for AMD and NvidiaMS2011/04/15 05:04 AM
        New Article: Predicting GPU Performance for AMD and NvidiaKevin G2011/04/16 02:25 AM
          New Article: Predicting GPU Performance for AMD and NvidiaDavid Kanter2011/04/16 08:42 AM
          New Article: Predicting GPU Performance for AMD and NvidiaVincent Diepeveen2011/04/20 02:20 AM
    memoryMoritz2011/04/14 09:03 PM
      memory - moreMoritz2011/04/15 11:11 PM
  New Article: Predicting GPU Performance for AMD and NvidiaKevin G2011/04/14 11:30 AM
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