my Recent average credit will be decreased day by day, why?


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Questions and Answers : Windows : my Recent average credit will be decreased day by day, why?

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Crazy Alien
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Taiwan
Message 755516 - Posted: 19 May 2008, 9:11:40 UTC

hello guys!

my Recent average credit will be decreased day by day even I upload new finished jobs every time, I only can see my Recent average credit be decreased, why? the Recent average credit should be increased since upload new finished jobs
I don't know what problem be happened? could you answer to me? Thanks!

Profile Ageless
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Message 755528 - Posted: 19 May 2008, 10:34:39 UTC
Last modified: 19 May 2008, 10:34:54 UTC

The recent average credit will only increase if you get continuous credit. Checking your computers, I see that most of the tasks you returned are pending, meaning they are waiting for your wingmen to return the same tasks so credit can be given out.

So while waiting for that credit to be given, the natural decay on the RAC will let it go down. Still nothing to worry about as it'll go back up when a lot of those tasks will get credit.
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Jord

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Crazy Alien
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Message 755532 - Posted: 19 May 2008, 10:41:39 UTC - in response to Message 755528.

Thanks for your response,I know the reason, Thanks you!

Profile Scott Amerland (N5ZOW)
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Message 759337 - Posted: 27 May 2008, 12:16:26 UTC - in response to Message 755528.

So while waiting for that credit to be given, the natural decay on the RAC will let it go down. Still nothing to worry about as it'll go back up when a lot of those tasks will get credit.



The average is determined over what span of time?


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Message 759342 - Posted: 27 May 2008, 12:28:16 UTC - in response to Message 759337.

http://www.boinc-wiki.info/RAC
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Profile jim
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Message 759761 - Posted: 28 May 2008, 4:25:35 UTC

OK, well, Ive just read that link above. . . but I can't see the answer? RAc is determined over just what span? Maybe it's me, but I thought it was calculated over 30 days????
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Profile Gundolf Jahn
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Message 759803 - Posted: 28 May 2008, 7:41:47 UTC - in response to Message 759761.
Last modified: 28 May 2008, 7:43:02 UTC

OK, well, Ive just read that link above. . . but I can't see the answer? RAc is determined over just what span? Maybe it's me, but I thought it was calculated over 30 days????

Citation from the link above:
If an entire week passed since the last credit was granted, the Recent Average Credit for the object will be divided by 2. The actual calculation is exponential.

And the given formula for Recent Average Credit is
RAC(new) = RAC(old)*d(t) + (1-d(t))*credit(new)

Where d(t) is the decay function, and t is the time (in seconds) since the last Recent Average Credit recalculation.

d(t) = e^(-ln(2)*t / 604800)

where 604800 seconds are 7 days.

So you can say that in a way the "span" is a week, though the calculation isn't that of the "normal" mean value where you divide a sum of values by the accumulated time.

Gruß,
Gundolf
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Questions and Answers : Windows : my Recent average credit will be decreased day by day, why?

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