AMD Compute and Texture Fetch

Article: Predicting AMD and Nvidia GPU Performance
By: anon (anon.delete@this.anon.com), April 22, 2011 4:30 pm
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 4/22/11 wrote:
---------------------------
>EduardoS (no@spam.com) on 4/22/11 wrote:
>---------------------------
>>David Kanter (dkanter@realworldtech.com) on 4/21/11 wrote:
>>---------------------------
>>>My understanding (http://www.realworldtech.com/page.cfm?ArticleID=RWT121410213827&p=7)
>>>is that on Cayman and Cypress, the ALUs are used for address calculations.
>>
>>As CPUs use ALUs for more complex address calculations but >we don't call "address
>>calculations" as "texture fetch", do we?
>
>I don't see your point. Some uarchs have dedicated AGUs (e.g. most x86), some
>do not (e.g. IBM, IA64).

IBM doesn't have dedicated AGUs?!? That's a new one.

IIRC only IA64 doesn't have AGUs as it has braindead simple addressing ideal for regular data/array access.

>Some ISAs only have simple addressing, which adds more
>to the dynamic instruction count - some have complex addressing and fewer instructions.
>
>In the case of AMD, they don't have dedicated AGUs. I think nvidia does, but I wouldn't swear by it.
>
>In this case, the texturing is relevant, because it means that AMD's cache is read-only. It's not a real R/W cache.
>
>>>However,
>>>initiating a texture fetch is fairly quick - most of the time is spent waiting for
>>>data.
>
>>Anh... 16 cycles each?
>
>16 cycles for what? AGEN or a texture cache read?
>
>David
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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
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          of causeEduardoS2011/04/14 02:55 PM
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                      lack of detailEduardoS2011/04/20 12:45 PM
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              gpgpuEduardoS2011/04/17 01:31 PM
                gpgpuGroo2011/04/17 01:58 PM
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                  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
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                          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
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                      gpgpuEduardoS2011/04/20 06:27 PM
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  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
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    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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