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Old 2020-05-02, 00:16   #51
SethTro's Avatar
Apr 2019

23·52 Posts

Originally Posted by chalsall View Post
OK... For my edification, how "deep" into the GPU compute results does your proposal go? As in, would this be useful for catching unreliable GPUs (presumably, only after doing a second run, and not seeing the same residue)?

The question many will ask is it worthwhile to do this? A missed factor doesn't really impact GIMPS much (and certainly won't result in a missed MP). But I think there may be some interest in this ability (if it isn't too computationally expensive -- the second runs could be a random distribution).
my proposal sits at the very end of the GPU compute so it allows us to verify the GPU is correctly computing pow(2, P, test) and not making math errors.

Additionally residuals are randomly distributed (and residuals with many leading zeros are rare) so we are verifying that they are doing a large amount of correct work without having to run a 2nd check.

I'm not sure the amount of description that's needed. If this doesn't make sense I can add more details.
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