More work for less credit / older CPU versus newer once


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Message boards : SZTAKI Desktop Grid : More work for less credit / older CPU versus newer once

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Profile Kahrs
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Message 2721 - Posted 20 May 2006 16:10:56 UTC

    Last modified: 20 May 2006 16:14:53 UTC

    Sometimes I look into the stats and wondering. Older CPU\'s sometimes do the job in nearly the same time, as I understand - the same job, but they are rated much less when you get credits. Will this mean that virtualy faster machines will be rated higher, even if they are doing obvisously senceless CPU time, having only a better virtual messuring??? I think this is hard stuff! Who can tell me a little more how it works and if I am right or wrong?
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    Message 2730 - Posted 21 May 2006 11:40:02 UTC - in response to Message 2721.

      Sometimes I look into the stats and wondering. Older CPU\'s sometimes do the job in nearly the same time, as I understand - the same job, but they are rated much less when you get credits. Will this mean that virtualy faster machines will be rated higher, even if they are doing obvisously senceless CPU time, having only a better virtual messuring??? I think this is hard stuff! Who can tell me a little more how it works and if I am right or wrong?



      It\'s possible that some of those differences you see are due to the use of optimized BOINC core clients.

      But w/o specific examples, it\'s hard to make a guess.
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      Profile Ananas
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      Message 2734 - Posted 22 May 2006 3:03:57 UTC

        The BOINC credits for most projects (except for SETI Enhanced and ClimatePrediction) are based on the benchmark result for floating point operations.

        If a project has more intmath components or needs faster memory throughput, the float benchmark might not be a good measure.


        The benchmark doesn\'t work well on some systems too. On Linux machines it is nearly always too low compared to the same hardware running Windows. Machines with more than one CPU sometimes have very jumpy benchmark results, depending on the programs that run while the benchmark results are evaluated.


        I have seen exotic big Unix systems with a bunch of CPUs that skiped the benchmark completely. This gives them a very low default benchmark value resulting in very low claimed credits.


        But even if the claimed credits can be quite random, the granted credits are not that random anymore,on the long run they are equalized by the majority of other machines.

        Even a machine that claims 0 for each result will have credit from the median of 3 results, a machine always claiming hundreds of credits will be limited by the same median.

        Of course the machine claiming 0 all the time will always be a bit behind the one claiming way too much all the time, but it will not be as much behind as the difference between the claimed credits of those two.

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        Message 2739 - Posted 22 May 2006 6:18:44 UTC - in response to Message 2734.

          Ananas, thank you for that answer, I now understnad that mechanism. Better would have been, if the poeple had used the real needed processortime for claiming and granting credits, but it is as it is and we will do it for helping someones and not to argue.
          We are going on to help and having fun ...
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