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daemion

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Message 2949 - Posted: 26 Sep 2007, 15:21:06 UTC

Hello all,

I recently crunched this Result where my computer, which is slower than my wingman's, completed the result within a fraction of the time it took the other result to complete. the odd thing is that my result was seen as valid.

anyone have any ideas as to what happened here?
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Profile Mr.Pernod
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Message 2950 - Posted: 26 Sep 2007, 15:30:32 UTC

did you by any chance restart BOINC or the computer during this particular result?
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Message 2951 - Posted: 26 Sep 2007, 16:06:01 UTC
Last modified: 26 Sep 2007, 16:06:13 UTC

From the stderr_out it looks to me like the result got restarted severeral times.

The current app (correct me if I'm wrong) only hands over the last running time, so the result probably took longer to crunch than it seems.


mic.


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Profile Jord
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Message 2952 - Posted: 26 Sep 2007, 16:13:16 UTC - in response to Message 2951.  

From the stderr_out it looks to me like the result got restarted severeral times.

The current app (correct me if I'm wrong) only hands over the last running time, so the result probably took longer to crunch than it seems.


That's correct. Each time the result is restarted after you exited BOINC, did a system restart or something else, the counter will start from zero. The application does internal checkpointing though. So a 4.5 hour result ran with halts and breaks can show as having run for 3.5 minutes and still get the credit.
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Message 2953 - Posted: 26 Sep 2007, 16:36:27 UTC

ahh i see. i don't exactly recall turning off the computer but it certainly is possible. i knew that the CPU time counter reset in the boinc manager when the result was paused, i just didn't know that total CPU time which shows up on the server didn't factor in the checkpointing and just posts the total time from the last pause to completion.

thank you for your fast, clear and succinct responses!
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Message 2954 - Posted: 26 Sep 2007, 17:05:22 UTC

ahh i see. i don't exactly recall turning off the computer but it certainly is possible.


If you got another project running on that machine, the switching from one project to another can be cause for the restarts...


mic.


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Forums : Technical Support : Odd Result