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Fritz
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Message 6514 - Posted 5 Aug 2007 18:59:45 UTC

    Last modified: 5 Aug 2007 19:01:23 UTC

    WUID 538791

    3 results returned. Each shows the same report
    Each shows validate state as Initial

    2 results have 13.7 credit granted. The 3rd result shows 0 credit granted. The third result is one day later than the other 2, but that appears to be the only difference.
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    Stick
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    Message 6516 - Posted 5 Aug 2007 21:04:54 UTC - in response to Message 6514.

      WUID 538791

      3 results returned. Each shows the same report
      Each shows validate state as Initial

      2 results have 13.7 credit granted. The 3rd result shows 0 credit granted. The third result is one day later than the other 2, but that appears to be the only difference.


      I was expecting to see that the invalid result had been interrupted/restarted - there is well known problem here with checkpointing. But that is not the case. However, I noticed that the two which received credit are linux and the other is windows. I didn\'t think SZTAKI was having problems with mixed results - but maybe so.

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      Fran
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      Message 6532 - Posted 13 Aug 2007 23:20:50 UTC

        It seems I have same problem, 3 result returned, all with Succes, validate state Initial, first two got credit, the third (my, of course) got credit 0.

        I`m new in this project, so please excuse my non-knowledge (and my English ;o) too.)

        Stick
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        Message 6534 - Posted 14 Aug 2007 1:27:55 UTC - in response to Message 6532.

          Last modified: 14 Aug 2007 1:31:39 UTC

          It seems I have same problem, 3 result returned, all with Succes, validate state Initial, first two got credit, the third (my, of course) got credit 0.

          I`m new in this project, so please excuse my non-knowledge (and my English ;o) too.)


          Your result indicates that BOINC was stopped and restarted while the unit was being processed (at line 7 and line 21). I suspect it encountered the SZTAKI checkpointing bug. (A checkpoint is disk file that is used when a program is resumed after being interrupted or restarted.) Sometimes SZTAKI has problem with checkpoints that are written while the program is in the middle of processing a line. But those written at the end of a line are usually OK. (If you look at a SZTAKI result under the BOINC Manager \"Tasks\" tab, you\'ll see that \"Progress\" jumps ahead in discrete increments - for a 50 line unit it jumps 2% every time it finishes a line.) Therefore, if you stop BOINC right after SZTAKI has jumped ahead by 2% and then restart, the result will probably be OK. But, if BOINC is restarted after SZTAKI starts another line (and writes a mid-line checkpoint), there\'s a good chance the \"bug\" will strike and that will cause the result to be invalid. This old thread has some more discussion of the issue. The project has been improved since that thread was written and the problem is much less frequent now.
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          Profile Raimund Barbeln
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          Message 6535 - Posted 14 Aug 2007 10:42:46 UTC

            Last modified: 14 Aug 2007 10:44:40 UTC

            Have a look at this WU:
            WU:560281
            It was not interupted, but still got 0 credits, validate state is initial.
            My Result was crunched on a Linux machine, the other 2 on a Windoes machine.
            So there really seems to be a problem with mixed results!!!!
            And one of the Windows results that got credit was interupted.
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            Fran
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            Message 6536 - Posted 14 Aug 2007 12:25:41 UTC - in response to Message 6534.

              To Stick

              Thanks a lot for your explanation. Yesterday after I wrote my post, I looked at the forums about bugs, and I think I understand.

              But if problem is much less frequent now (as you wrote), it means still exists.. So what can I do? Nothing... :o)

              Stick
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              Message 6537 - Posted 14 Aug 2007 17:57:15 UTC - in response to Message 6536.

                But if problem is much less frequent now (as you wrote), it means still exists.. So what can I do? Nothing... :o)


                Fran,

                You can do some things to avoid the problem. They involve a little managing of BOINC and controlling when you shutdown and/or restart your computer. The objective is to only stop SZTAKI after it has written a \"good checkpoint\". That is, to avoid stopping SZTAKI after it has written a potentially \"bad checkpoint\".

                SZTAKI writes a \"good checkpoint\" after finishing a \"Line\" of work - as indicated by a discrete \"jump\" in \"Progress\" (2% for a 50 line WU). \"Bad checkpoints\" happen somewhere \"between the lines\".

                There is a BOINC General Preference setting entitled \"Write to disk at most every\". (Mine is set to 300 seconds.) For SZTAKI, this preference setting determines when a potentially \"bad checkpoint\" might be written. For me, it means that, when SZTAKI finishes a line and writes a \"good checkpoint\", it could then write a \"bad checkpoint\" 300 seconds later. But, if it finishes the next line before the 300 seconds are up, it will write another \"good checkpoint\" and start counting another 300 seconds, etc. Therefore, if you set your BOINC \"Write to disk at most every\" preference to a high value, the probability of SZTAKI writing a \"bad checkpoint\" is reduced. However, if you are also running other BOINC projects, there is a \"downside\" to doing this. Higher values mean more potential \"lost work\" (for the other projects) following computer shutdowns. In other words, it\'s a \"trade-off\".

                Another thing you can do (if you are planning to shutdown your computer) is to make sure it is \"safe\" for SZTAKI to stop. That is, you can go to BOINC Manager and force SZTAKI to run (by suspending all other projects). Then watch for the next \"jump\" in \"Progress\" before shutting down. As long as you start the \"shutdown\" process before SZTAKI can write another checkpoint, you will be OK.

                Hope this helps!

                Stick

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                Stick
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                Message 6538 - Posted 14 Aug 2007 18:09:59 UTC - in response to Message 6535.

                  Last modified: 14 Aug 2007 18:26:39 UTC

                  Have a look at this WU:
                  WU:560281
                  It was not interupted, but still got 0 credits, validate state is initial.
                  My Result was crunched on a Linux machine, the other 2 on a Windoes machine.
                  So there really seems to be a problem with mixed results!!!!
                  And one of the Windows results that got credit was interupted.


                  IMO, this warrants starting a new thread.

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                  Fran
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                  Message 6541 - Posted 15 Aug 2007 3:30:56 UTC - in response to Message 6537.

                    Another thing you can do (if you are planning to shutdown your computer) is to make sure it is \"safe\" for SZTAKI to stop. That is, you can go to BOINC Manager and force SZTAKI to run (by suspending all other projects). Then watch for the next \"jump\" in \"Progress\" before shutting down. As long as you start the \"shutdown\" process before SZTAKI can write another checkpoint, you will be OK.


                    This is really good advice, I`ll try. Thanks a lot again!

                    Maybe, restarting computer is usually not so necesary that I couldn`t wait, until the task is done (with other suspended). I just must watch...

                    Simple solutions are the greatest...

                    I`m running more Boinc projects, so I would not to change the frequncy of writing to disk.



                    Profile kadam
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                    Message 6544 - Posted 15 Aug 2007 10:48:14 UTC

                      Read here.
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                      Wabbit98
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                      Message 6579 - Posted 27 Aug 2007 5:41:29 UTC

                        Will there be a way to get credit for these, since I have gotten one myself and it took about 5 hours to complete the WU.

                        http://szdg.lpds.sztaki.hu/szdg/workunit.php?wuid=567637
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                        Profile Nightbird
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                        Message 6583 - Posted 27 Aug 2007 15:37:12 UTC - in response to Message 6579.

                          Will there be a way to get credit for these, since I have gotten one myself and it took about 5 hours to complete the WU.

                          http://szdg.lpds.sztaki.hu/szdg/workunit.php?wuid=567637

                          In the past, Adam granted credits manually.

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                          Profile KPX
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                          Message 6627 - Posted 5 Sep 2007 13:51:02 UTC

                            Could I please also get credit for a unit I spent many hours calculating..., claimed credit 111, awarded credit 0:

                            1659004 570055 19 Aug 2007 7:55:42 UTC 31 Aug 2007 20:27:53 UTC Over Success Done 137,281.69 111.08 0.00

                            Stick
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                            Message 6629 - Posted 5 Sep 2007 14:23:48 UTC - in response to Message 6627.

                              Could I please also get credit for a unit I spent many hours calculating..., claimed credit 111, awarded credit 0:

                              1659004 570055 19 Aug 2007 7:55:42 UTC 31 Aug 2007 20:27:53 UTC Over Success Done 137,281.69 111.08 0.00


                              You should read the Validation Problems - Windows vs. Linux thread. Your unit probably got a \"zero\" because it was a Linux result and the other two results were Windows.
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