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Old 2021-07-12, 09:25   #78
axn
 
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Originally Posted by kriesel View Post
Thanks. It looks like it is doing the right thing and should be, in theory, little bit (10-15%) faster than v6 stage 2.

I believe you said there was a general FFT regression from v6 to v7. Could this explain why v7 stage 2 is slower than v6, despite having a better stage 2 algorithm?
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Old 2021-07-12, 13:51   #79
kriesel
 
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Originally Posted by axn View Post
I believe you said there was a general FFT regression from v6 to v7.
It depends on the fft length apparently, per https://www.mersenneforum.org/showpo...35&postcount=2

Note due to the time required for even a single PRP benchmark per fft length across all supported lengths per selected Gpuowl version and single OS version, the tabulated values are single measurements each

Quote:
Could this explain why v7 stage 2 is slower than v6, despite having a better stage 2 algorithm?
Partially. It does not explain the full magnitude of discrepancy in V7/v6 P-1 performance ratio, between ~112% expectation and ~75% observation.

Last fiddled with by kriesel on 2021-07-12 at 13:55
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