PLEASE EXPLAIN THIS WORK UNIT


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Stanley A Bourdon
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Message 569 - Posted 6 Aug 2005 18:57:04 UTC

    Hi

    @Adam

    please explain this workunit

    <a href="http://szdg.lpds.sztaki.hu/szdg/workunit.php?wuid=1737">found here </a>.

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    Profile Brian Stansbury
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    Message 585 - Posted 7 Aug 2005 22:20:13 UTC

      It is the different OS issue again. The one that got credit is using Linux and the rest are using Windows. There are a lot of these, but usually the other way around on credit.
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      Profile Nightbird
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      Message 588 - Posted 8 Aug 2005 2:59:21 UTC

        Last modified: 8 Aug 2005 2:59:32 UTC

        like this one
        http://szdg.lpds.sztaki.hu/szdg/workunit.php?wuid=2371
        Different OS under Windows and different CC
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        Profile Neil Woodvine
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        Message 589 - Posted 8 Aug 2005 3:50:37 UTC

          Just curious, how does this work on other projects ? do linux and windows systems have seperate quorums ? i mean is a work unit split between different OS's ? or are we just seeing a major difference in the results from the different OS's ?

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          Hermes
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          Message 591 - Posted 8 Aug 2005 8:55:01 UTC

            Predictor@home has set "Homogeneous Redundancy" in their scheduler so it sends the results for one work unit to just one platform/CPU-vendor combination. Einstein@home has relaxed the restrictions on the validator to accept results that have slight differences. Altough it took some time for them to find the right amount of "difference" to allow.
            Most of the other projects will probably have implemented one or the other solution by now.

            I just wonder, why every projekt has to make the same mistakes all over again? Is there no "Howto make a properly running Boinc Projekt", that warns of the common problems? Like having an underpowered database, setting a too tight deadline and that the different compilers from different OSes produce diffenrent code that will almost certainly lead to different results. (At least when using floating point math)
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            Profile kadam
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            Message 595 - Posted 8 Aug 2005 9:57:05 UTC

              Alright, we have localized a validator error, that's why some successful results don't get any credits. We are working hard on it, to overcome the error.
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              Profile Nightbird
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              Message 602 - Posted 8 Aug 2005 19:56:57 UTC

                Thanks to you :)
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                koerni
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                Message 619 - Posted 9 Aug 2005 23:18:31 UTC

                  @hermes
                  What you mean with "Homogeneous Redundancy"?
                  For me it looks like i do not know why the results are different,
                  but i accept them both as right.
                  Only sense for different workunits for different platforms makes
                  if they calculate different things amd so you can save resources for
                  writing the "same" software different platforms, but not because
                  of sientific reasons.
                  To relax restrictions in validating is the right way as long as you
                  know that the result is still correct, because differences have a resaon.
                  On the other hand you need to relax the restrictions because if there
                  are differences you can not trust on the correctness of the results
                  and the believed precision of the result you have to correct the same way.

                  What a luck to have differents platforms.

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                  John McLeod VII
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                  Message 620 - Posted 9 Aug 2005 23:46:47 UTC

                    Homogenous redundancy is when you assign a single WU to computers with the same processor and OS, instead of the hetrogenous redundancy where a WU may be assigned to any computers.
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