exorbitantly long computation time

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daemion
daemion
Joined: 13 Jul 06
Posts: 5
Credit: 1616676
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20 Jul 2006 0:10:08 UTC
Topic 191593
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    this ancient computer of mine usually crunches a WU in 5-6 hours, but look at this one

    http://einsteinathome.org/workunit/11065399

    any idea why it took about 5 times longer for the same credit

    thanks in advance


    Dave Burbank
    Dave Burbank
    Joined: 30 Jan 06
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    exorbitantly long computation time

    20 Jul 2006 1:00:44 UTC
    Message 42671
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      It looks like BOINC stopped the science application, restarted it, stopped it again, and then resumed at the first checkpoint; re-crunching what had already been computed. From your stderr out file:

      2006-07-18 04:16:18.7812 [normal]: Start of BOINC application 'projects/einstein.phys.uwm.edu/einstein_S5R1_4.02_windows_intelx86.exe'.
      2006-07-18 04:16:18.7968 [normal]: Started search at lalDebugLevel = 0
      2006-07-18 04:16:20.6406 [normal]: Checkpoint-file 'Fstat.out.ckp' not found.
      2006-07-18 04:16:20.6406 [normal]: No usable checkpoint found, starting from beginning.
      Detected CPU type 0

      2006-07-18 20:15:30.4062 [normal]: Start of BOINC application 'projects/einstein.phys.uwm.edu/einstein_S5R1_4.02_windows_intelx86.exe'.
      2006-07-18 20:15:30.6875 [normal]: Started search at lalDebugLevel = 0
      2006-07-18 20:15:42.4218 [normal]: Found checkpoint-file 'Fstat.out.ckp'
      2006-07-18 20:15:42.4218 [normal]: Trying to read Fstat-file into toplist ...
      2006-07-18 20:15:43.3750 [normal]: Checksum Ok. Successfully read_toplist_from_fp()
      2006-07-18 20:15:43.3750 [normal]: Resuming computation at (14052/32981178/663789).
      Detected CPU type 0

      2006-07-18 21:39:08.0937 [normal]: Start of BOINC application 'projects/einstein.phys.uwm.edu/einstein_S5R1_4.02_windows_intelx86.exe'.
      2006-07-18 21:39:08.0937 [normal]: Started search at lalDebugLevel = 0
      2006-07-18 21:39:10.4531 [normal]: Found checkpoint-file 'Fstat.out.ckp'
      2006-07-18 21:39:10.4531 [normal]: Trying to read Fstat-file into toplist ...
      2006-07-18 21:39:10.9531 [normal]: Checksum Ok. Successfully read_toplist_from_fp()
      2006-07-18 21:39:10.9531 [normal]: Resuming computation at (14052/32981178/663789).
      Detected CPU type 0
      2006-07-19 19:25:35.1320 [normal]: Search finished successfully.

      Why this would happen I'm not too sure. You might check to make sure under BOINC general preferences 'Write to disk at most every' is not set very high, the default is 60 seconds. If it is set high and BOINC switches apps, your progress may not have been written to disk. The next time einstein is called it returns to the original checkpoint, re-crunching what had already been calculated but not saved.

      There are 10^11 stars in the galaxy. That used to be a huge number. But it's only a hundred billion. It's less than the national deficit! We used to call them astronomical numbers. Now we should call them economical numbers. - Richard Feynman

      daemion
      daemion
      Joined: 13 Jul 06
      Posts: 5
      Credit: 1616676
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      thanks for the imput dave, i

      20 Jul 2006 1:49:03 UTC
      Message 42672
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        thanks for the imput dave, i have not changed the default settings for BOINC (it is still writing atleast every min) and this is the only project i am running on this machine.

        the obvious question is why would BOINC recrunch a WU 3 times.....

        oh well, i guess ill just have to cross my fingers and hope it doesnt happen again


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