Times (Elapsed / CPU) for BRP5/6/6-Beta on various CPU/GPU combos - DISCUSSION Thread

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Bikeman (Heinz-Bernd Eggenstein)
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RE: I have opted in for the

15 Mar 2015 14:10:25 UTC
Message 130778 in response to message 130776
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    Quote:
    I have opted in for the Beta and it seems these tasks have a much higher priority over standard units. It's no problem as far as Beta would (besides testing) crunch real data (not dummies). Is that so ?

    It is definitely real data, so 100% of the computing time goes to real science. By flagging the app "beta" we make sure that the second result ("wingman's result") that is used to validate a result is generated by a non-beta application, which gives us the extra-safety to let beta-apps crunch real data.

    Quote:

    I have also noticed that when running a single WU on a Tesla K20, the GPU usage seems to be fluctuating from 0% to >90% ever few seconds. Not sure if that is normal behavior..

    Depends on the sampling interval. There are small time intervals when the CPU is processing stuff and if the sampling interval of the NVIDIA tool is small enough to fit in, this will result in a 0% reading.

    HB

    Mumak
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    RE: It is definitely real

    15 Mar 2015 14:20:14 UTC
    Message 130779 in response to message 130778
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      Quote:
      It is definitely real data, so 100% of the computing time goes to real science. By flagging the app "beta" we make sure that the second result ("wingman's result") that is used to validate a result is generated by a non-beta application, which gives us the extra-safety to let beta-apps crunch real data.

      Thanks for the clarification, this is the perfect combination.

      Quote:

      Depends on the sampling interval. There are small time intervals when the CPU is processing stuff and if the sampling interval of the NVIDIA tool is small enough to fit in, this will result in a 0% reading.

      Sampling interval is set to 2 seconds and almost every other (or a few other) tick the fluctuation occurs. I have checked the standard non-beta units and they show similar behavior, though the load seems somewhat more stable there. If you wish (and think this is not OK and is worth checking), I can create some graphs.

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      ExtraTerrestrial Apes
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      RE: If you wish (and think

      15 Mar 2015 16:03:32 UTC
      Message 130780 in response to message 130779
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        Quote:
        If you wish (and think this is not OK and is worth checking), I can create some graphs.


        I suppose this is quite normal, my HD4000 showed it as well. It's part of the reason you get higher throughput with 2 concurrent WUs on almost any GPU here.

        MrS

        Scanning for our furry friends since Jan 2002

        ExtraTerrestrial Apes
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        HBM wrote:Not sure yet. As I

        15 Mar 2015 16:06:15 UTC
        Message 130781 in response to message 130775
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          HBM wrote:
          Not sure yet. As I said the GW search needs most of our attention at the moment. For those participating in the beta test this should make no difference (except you will drop in the stats because everyone else will be catching up ;-) )


          ... except for the Intel GPU guys who stopped receiving betas since the 1st few of them last week. Any particular reason for this? Is it just that the full WUs take so long on those GPUs?

          MrS

          Scanning for our furry friends since Jan 2002

          Mumak
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          Here some graphics FYI. Used

          15 Mar 2015 16:09:41 UTC
          Message 130782
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            Here some graphics FYI.
            Used tool: HWiNFO64, info retrieved via NVML, sampling interval 2 secs
            GPU: Tesla K20c (ECC off, 758 MHz)
            single WU

            v1.39:

            v1.52:

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            Mumak
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            Some preliminary numbers for

            16 Mar 2015 7:08:51 UTC
            Message 130783
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              Some preliminary numbers for the Beta run for comparison:

              GPU: NVIDIA GeForce GTX 660 Ti
              CPU: Intel Core i7-860
              2 x BRP6 v1.39: 17,300 - 18,400
              2 x BRP6 v1.52: 11,200 - 11,400

              GPU: NVIDIA Tesla K20c (ECC off, GPU clock 758 MHz)
              CPU: 2 x Intel Xeon E5-2650 v3
              2 x BRP6 v1.39: 11,200 - 12,700
              2 x BRP6 v1.52: 6,600 - 9,200
              Here you can see the variance with the Beta is much higher. I don't know why yet..

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              Mumak
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              Here in graph - this is on

              16 Mar 2015 8:58:01 UTC
              Message 130784
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                Here in graph - this is on the Tesla K20c.

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                Filipe
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                HOST: I3 4130 + AMD RADEON R9

                17 Mar 2015 10:06:19 UTC
                Message 130785
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                  HOST: I3 4130 + AMD RADEON R9 280 (CPU Running 1 GW unit):

                  BRP6 v1.41 21600sec (5 GPU tasks running simultaneously)

                  BRP6 v1.52 13000sec (5 GPU tasks running simultaneously)

                  Improvement: 40%!!!!

                  Mumak
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                  I have updated the above

                  17 Mar 2015 10:40:11 UTC
                  Message 130786 in response to message 130784
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                    I have updated the above graph with more data and other GPUs.

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                    Chris
                    Chris
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                    I only ran 2 so far. 15%

                    18 Mar 2015 1:19:23 UTC
                    Message 130787
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                      I only ran 2 so far.

                      15% faster on a GTX 640 (about 25k seconds vs 30k seconds), but the CPU usage was reduced to a third (~2k instead of ~6k).

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