gpgpu

Article: Predicting AMD and Nvidia GPU Performance
By: EduardoS (no.delete@this.spam.com), April 20, 2011 12:59 pm
Room: Moderated Discussions
Vincent Diepeveen (diep@xs4all.nl) on 4/20/11 wrote:
---------------------------
>I'll have to benchmark it a lot anyway which type of multiplication is fastest.

Also, you can look at the generated code to see if there is more than one mul for each VLIW instruction...

tip: I have looked even knowing the answear...

>Only Volkov mentions it.

I didn't heard that from Volkov... BTW I think you are giving too much credit for him, there are many more people involved, some more involved and for more time...

>It's 4 cycles at both Nvidia as well as AMD GPU's before for simple instructions your result is available.

It's for 4 cycles for the instruction to be issued for all lanes, in ATI case it's more 4 cycles for another wavefront to issue instructions and maybe for the first wavefront to execute then finally more 4 cycles to issue the next instruction, maybe a more correct number would be 16 because only after 16 cycles the result would be avaliable, anyway, this doesn't matter.

BTW, in nVidia case starting on Fermi it's just 2 cycles to issue the wrap, the number of cycles to execute vary.

>An instruction can take 4 such as trivial 'add', but you don't have your results
>until 5th cycle.

Until the 9th cycle on AMD hardware.

>Any claim of determinism shows your ignorance.

Same contitions, same results = deterministic

Almost same conditions different results and a conclusion = you are an idiot.

>Does power7 only have a single aircooled microtiny fan that has to cool 400+ watt,
>from which at least a 100+ over specs of the pci-e?

It's 250W if I remember correctly, for z196 it's even more, draw your own conclusions.
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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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