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Old 2020-07-19, 12:27   #483
ATH
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Dec 2003
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Both with and without -r roundoff error detection PFGW AVX-512 fails on iteration 15177501:

Quote:
Special modular reduction using AVX-512 FFT length 864K, Pass1=192, Pass2=4608, clm=4, 4 threads on 10^4568899-1
Detected in MAXERR>0.45 (round off check) in prp_using_gwnum
Iteration: 15177501/15177550 ERROR: ROUND OFF 0.5>0.45
PFGW will automatically rerun the test with -a1
Special modular reduction using AVX-512 FFT length 896K, Pass1=2K, Pass2=448, clm=1, 4 threads on 10^4568899-1
Detected in MAXERR>0.45 (round off check) in prp_using_gwnum
Iteration: 15177501/15177550 ERROR: ROUND OFF 0.5>0.45
PFGW will automatically rerun the test with -a2
Special modular reduction using AVX-512 FFT length 960K, Pass1=1536, Pass2=640, clm=1, 4 threads on 10^4568899-1

mprime AVX-512 864K base3 type1 test matches the Prime95 FMA3 type1 residue: 1858D4AA742E6849

Last fiddled with by ATH on 2020-07-19 at 12:30
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