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Old 2021-12-26, 19:55   #2751
ewmayer
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Quote:
Originally Posted by Prime95 View Post
I suspect if you run the same exponent on an AMD GPU you would have the same problem. But maybe not as gpuowl chooses different default optimizations for the different architectures.

IIRC, Mihai was pretty aggressive in choosing FFT size. Something like willing to tolerate a 0.5% chance or a bad run. I think I lobbied for at most 0.1%. I don't remember what finally happened. No matter what target we choose, this scenario was going to be a possibility -- even a likelihood.
Still, there's no good reason the run should just abort, since the context - exponent close to an FFT-length breakover point - points to fatal ROE (not detected by gpuOwl except in this backdoor way) as the likely cause of the repeated GEC errors. The easy thing to do is for the program to auto-switch to the next-larger FFT length. Or rerun an iteration interval bracketing the error with ROE checking enabled. Or restart from the last savefile and fiddle the residue shift - one more reason supporting shift is useful - since different shift at same iteration yields different error behavior.
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Old 2022-01-03, 14:57   #2752
ATH
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Originally Posted by ATH View Post
I can find 19 "PRP Bad" which is a lot more than I thought, but it is only 4 different users:
A new PRP DC mismatch: 85090169
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