Message boards : Number crunching : "Dummy" Work units complete after less than 0,1sec ?
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Profile dr_mabuse
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Message 16301 - Posted: 12 Feb 2007, 15:15:58 UTC

Hi experts,
today I got, after long time of waiting, 10 work units which were finished almost instantaneously.
They were uploaded with correct result,
They brought up no credits, of course.
I never had such short runs; are these workunits dummiees to test the distribution system ?

thanks for help
Jochen from Old Germany
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Profile [SETI.USA]Tank_Master
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Message 16302 - Posted: 12 Feb 2007, 17:14:13 UTC

I got around 60 of those pending. Total credit expected: .23 :D
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Message 16304 - Posted: 12 Feb 2007, 18:26:18 UTC - in response to Message 16301.  

Hi experts,
today I got, after long time of waiting, 10 work units which were finished almost instantaneously.
They were uploaded with correct result,
They brought up no credits, of course.
I never had such short runs; are these workunits dummiees to test the distribution system ?

thanks for help
Jochen from Old Germany


Hi Jochen,

I think you were just unlucky - LHC gives out work that is very short sometimes but not as a deliberate 'dummy' run. As you know the software looks at how stable the orbits of the particles are in the simulated LHC, and it does this by following the particle round 100,000 or 1,000,000 turns of the machine.

Sometimes the particle hits the wall on the first or second turn. Then there is no point carrying on. Unfortunately, jobs come in series with similar parameters, so when you get one of these short runs you tend to get several in the same download.

How you could tell for sure is that a real dummy job would have an estimated time to completion of a few seconds before it was run; wheras a real job that runs short would have a more reasonable estimate, but then finish well before the estimate.

Hope that helps, and better luck next time!

R~~
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Message boards : Number crunching : "Dummy" Work units complete after less than 0,1sec ?


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