>Marc Getty <[EMAIL PROTECTED]> wondered previously
>
>How does the CPU time contributed get calculated? I would assume that
>there is a
>standard credit for each FFT size, but I can't find what that credit is
>anywhere
>on mersenne.org.
>
>Can anyone help fill in the following?
Taking the data from the status page on mersenne.org where it gives timings
per fft size per iteration, taking the mid-point exponent for each fft size
and then multiplying by the 5.5 conversion factor that George quotes gives
the following
FFT Exponent Credit (P90 years)
160 2972750 0.043
192 3612500 0.062
224 4266500 0.089
256 4924000 0.113
320 5882500 0.177
384 7122500 0.262
448 8375000 0.368
512 9670000 0.474
640 11575000 0.751
768 14050000 1.110
896 16560000 1.548
1024 19125000 2.001
1280 22865000 3.094
1536 27715000 4.515
1792 32600000 6.328
2048 37675000 8.056
2560 45075000 12.861
3072 54650000 18.967
3584 64200000 26.648
4096 74150000 33.675
And yes there are a few of us using fft's in excess of 1792, like up in the
4096 range.....so when my exponent gets done in 2004 I should get about 36
years of credit in one hit <G>
regards
G
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