Credit over-reporting

Questions and Answers : GPU applications : Credit over-reporting
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Message 904062 - Posted: 5 Jun 2009, 19:10:27 UTC
Last modified: 5 Jun 2009, 19:11:35 UTC

I have a Q9300 with a 9500GT video card, processing with the stock CUDA app. CUDA WU's processed on this combo always seem to request more credits than the other, non-CUDA apps that the WU's are matched to. Is this normal? or Is this something that should be looked into?

The WU's seem to match up, credit-wise, with other stock CUDA apps on the few times (I've seen, at least...) that both WU's have been processed by CUDA. (although a different NVidia GPU was used...)
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Message 904064 - Posted: 5 Jun 2009, 19:25:22 UTC

Yes, it is a known issue with CUDA clients to overclaim, as has been said around here a few times.

The problem stems from the fact that there's no way to properly count GPU seconds so that a proper claim can be made. In fact, only the CPU time is counted when making the claim, and the only thing the CPU does is load the WU and save the results, thus spending very little time. Since BOINC thinks the CPU completed so many FLOPs so fast, it claims higher thinking it performed a lot of work quickly.

Until the devs figure out a way to properly count GPU seconds within BOINC, this will always be an issue.
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Message 904078 - Posted: 5 Jun 2009, 20:04:57 UTC - in response to Message 904064.  
Last modified: 5 Jun 2009, 20:08:01 UTC

Oh... I haven't hung around the CUDA boards enuf to have seen that, and it isn't apparent from the (first page, at least) thread titles...

There does seem to be some proportionality to the claim disparity that I've seen, though... for example, CUDA claims 12 credits when the CPU app it's paired with claims 10, CUDA claims 43 when the CPU claims 38, etc...
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Questions and Answers : GPU applications : Credit over-reporting


 
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