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paleseptember 2010-02-08 01:01

Just checking in with some ongoing benchmarks.
In the 5.7M ranges, prime95 is using a zero-padded FFT length 640K, with iteration times of approximately 0.015s/iteration on a stock Q6700 @ 2.66GHz running on three (of the four) cores. That translates to pretty much exactly 24 hours per test per core.
(This update was prompted by [URL=""]this thread concerning the efficacy of ECM and P-1 testing.[/URL])

Cybertronic 2010-02-08 10:00

Also a benchmark from me.

2^5720440+40291 is done in 19h on a 3.4 Ghz Phenom.

(Only estimated.)

Jeff Gilchrist 2010-09-16 15:25

Anyone try the new Prime95 v26 to see how much of a speed difference in any it makes with 5orB PRP tests?



geoff 2010-09-19 00:47

For 896K FFT, the per iteration time went from 0.020 with version 25.11 to 0.018 with version 26.2 on my Core 2 Duo 2.66GHz, so should save about 2 hours per test.

geoff 2010-09-24 03:06

More accurately, for the current PRP tests at ~8M (896K FFT) the new mprime version 26.2 takes 41h20m on my C2D 2.66GHz, which is a savings of almost 4 hours per test compared to version 25.11.

enderak 2010-09-25 00:04

v26 seems to be quite a bit faster on my i7 as well. Still early to tell exactly how much faster, but it seems to be about the same speedup as geoff.

Jeff Gilchrist 2010-09-25 10:20

Even my older Pentium D machine when from 0.032 sec/iter down to 0.027 sec/iter.

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