Einstein Settings Question...

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TimeLord04
TimeLord04
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13 Jun 2014 19:47:12 UTC
Topic 197607
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    In "Settings" I turned off "CPU". ("CPU=No")

    Yet further down in Settings was a separate mark for CPU+GPU crunching. I left that one to "Yes"; and now Einstein uses 1 core of my dual core processor, plus GPU crunching.

    Do I have to utilize a CPU core; or, can I select GPU only??? Won't my system crunch a WU faster crunching completely on GPU??? Or, is there another reason that CPU+GPU is wanted by Einstein settings... Heat reasons, or whatever???...???

    Thanks,

    TL

    TimeLord04
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    Darrell
    Darrell
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    Einstein Settings Question...

    13 Jun 2014 21:12:52 UTC
    Message 121892
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      1 cpu core is needed to feed the gpu the data.

      TimeLord04
      TimeLord04
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      OK... Currently my GTX760 is

      13 Jun 2014 21:51:25 UTC
      Message 121893
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        OK... Currently my GTX760 is crunching a WU, (with 1 CPU core), in one hour and 49 Min. So, I guess that's just the way it's going to be...

        No problem; just curious.

        TimeLord04
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        Gary Roberts
        Gary Roberts
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        You seem to be running mainly

        18 Jun 2014 1:54:39 UTC
        Message 121894 in response to message 121893
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          You seem to be running mainly FGRP3 GPU tasks. All GPU apps require at least a little CPU assistance but with FGRP3 tasks there is much more CPU involvement than with say BRP5 tasks. This is because quite a lot of the crunching job is still being performed on the CPU. This should improve in the future when the app is further developed.

          If your aim is to limit CPU involvement, you would be much better off setting your preferences to exclude FGRP3 and concentrate on BRP5. FGRP3 needs 1CPU + 1GPU to crunch a task. BRP5 running on nvidia GPUs needs 0.2CPU.

          If you were interested in making the most efficient use of your GPU, you could set preferences to run 3 or 4 BRP5 tasks concurrently and still not tie up a complete CPU core. Since 3x0.2 or even 4x0.2 is still less than a full core, all your CPU cores would still be available for whatever else you wanted to use them for. I have GTX650 GPUs (only 1GB) in dual core hosts running 3 BRP5 GPU tasks and 2 CPU tasks concurrently without problems. Of course the 2 CPU tasks run a little slower (as you might expect) but the impact is surprisingly small and more than compensated for with the increased GPU output. This is with Intel CPUs. It may not be the same experience with AMD. You'd have to experiment and find out.

          For technical questions like this, you're likely to get more responses if you post in a technical forum, eg Cruncher's corner, rather than the Cafe.

          Cheers,
          Gary.

          TimeLord04
          TimeLord04
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          RE: You seem to be running

          18 Jun 2014 2:36:19 UTC
          Message 121895 in response to message 121894
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            Quote:

            You seem to be running mainly FGRP3 GPU tasks. All GPU apps require at least a little CPU assistance but with FGRP3 tasks there is much more CPU involvement than with say BRP5 tasks. This is because quite a lot of the crunching job is still being performed on the CPU. This should improve in the future when the app is further developed.

            If your aim is to limit CPU involvement, you would be much better off setting your preferences to exclude FGRP3 and concentrate on BRP5. FGRP3 needs 1CPU + 1GPU to crunch a task. BRP5 running on nvidia GPUs needs 0.2CPU.

            If you were interested in making the most efficient use of your GPU, you could set preferences to run 3 or 4 BRP5 tasks concurrently and still not tie up a complete CPU core. Since 3x0.2 or even 4x0.2 is still less than a full core, all your CPU cores would still be available for whatever else you wanted to use them for. I have GTX650 GPUs (only 1GB) in dual core hosts running 3 BRP5 GPU tasks and 2 CPU tasks concurrently without problems. Of course the 2 CPU tasks run a little slower (as you might expect) but the impact is surprisingly small and more than compensated for with the increased GPU output. This is with Intel CPUs. It may not be the same experience with AMD. You'd have to experiment and find out.

            For technical questions like this, you're likely to get more responses if you post in a technical forum, eg Cruncher's corner, rather than the Cafe.

            Thanks Gary. :-)

            TimeLord04
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