Discrepancy in outstanding credits
21 May 2014 11:03:53 UTC
Topic 197591
(moderation:
Hallo!
Since some time I observe a hughe discrepancy between the outstanding credits listed in my account and the one I do calculate from pending tasks. For excample, at now I have 230 pending tasks from S6CasA and 8 pending tasks from BRP5 giving outstanding credits at all of 230*390.83 + 8*3333 = 116,554.90 . But in my account I do find at the same time listed 21,257.00. This is just 18.24% of that, what it should be. There is only a neglible rate of invalid tasks. So why a so low figure in my account? Is this only to mee, or also to all other participants, I aasume.
Kind regards and happy crunching
Martin
Discrepancy in outstanding credits
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Are you talking about your RAC? If so it is a complicated formula based on what have you done lately, with diminishing importance based on yesterdays and the day befores results. Here a couple of pretty generic explanations:
http://en.wikipedia.org/wiki/BOINC_Credit_System#Recent_average_credit
and http://boinc.berkeley.edu/wiki/Computation_credit
Lastly here is a downloadable spreadsheet, I think, from 2010 with a short discussion on it:
http://boinc.berkeley.edu/dev/forum_thread.php?id=5548
I found one more 'sorta' explanation of RAC:
"RAC is something like this: The sum of 1/2 the recent weeks credit + 1/4 the previous weeks credit + 1/8 the credit of the third week back, etc, all divided by seven to indicate average credit per day. It's probably something like the exponential moving average of the prices of stocks, commodities, etc. used to spot a trend."
I am guessing Richard Haselgrove could find a current explanation for you if you PM him, he has been helpful to me in the past when I had questions I couldn't find the answer too.
RE: Hallo! Since some time
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Try counting up the claimed credit, and not the actual credit you get when the task valids.
Claggy
RE: I am guessing Richard
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Yes. When a task is first reported - before it has been validated by a 'wingmate' - this project still shows the "claimed credit" calculated by BOINC (most projects have now suppressed that information, because it's arbitrary, erratic and (for GPUs) downright wrong). But it's still available here, and it's what they show as 'pending credit' on your account page.
But, as Bernd said recently:
As you have noticed, 'scientific' credit is not the same thing as BOINC credit. It's been that way, certainly as long as GPUs have been used at this project, maybe longer - and that's several years now.
Hallo! Thank-you for all of
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Hallo!
Thank-you for all of your encourage.
Claggy is right, they´re summing the Claimed Credits. Maybe for historical reasons? As all participants get the same earnage per task of an application, independent how cappable their CPU/GPU is. I think, it would be much easier to calculate this as I did. But offcourse, it do require extra work for changing the code. But as it is now, this figure has very little significance to me.
Thank-you all of you.
Kind regards and happy crunching
Martin
If you run only a single
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If you run only a single flavor of task, and don't have any invalidation trouble, then the claimed credit pending is a simple proportion to the expected to be rewarded credit.
Otherwise, if you are interested in combining pending with awarded credit to get a smoother update on your actual production, you could do as I do, and use a spreadsheet to post the pending work by task count by task type, and make your own pending credit by simple multiplication and adding.
I go this far, but don't take the extra step of accounting for variation in the amount of partially completed work. As most of my credit comes from Perseus GPU jobs which take a while to run on my hosts, this does leave some roughness I've not take the trouble to smooth out.