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Old 2010-02-08, 01:01   #78
paleseptember
 
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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 this thread concerning the efficacy of ECM and P-1 testing.)

Last fiddled with by paleseptember on 2010-02-08 at 01:05
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Old 2010-02-08, 10:00   #79
Cybertronic
 
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Also a benchmark from me.

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

(Only estimated.)

Last fiddled with by Cybertronic on 2010-02-08 at 10:49
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Old 2010-09-16, 15:25   #80
Jeff Gilchrist
 
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Anyone try the new Prime95 v26 to see how much of a speed difference in any it makes with 5orB PRP tests?

http://www.mersenneforum.org/showthread.php?p=229780

Jeff.
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Old 2010-09-19, 00:47   #81
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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.
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Old 2010-09-24, 03:06   #82
geoff
 
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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.
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Old 2010-09-25, 00:04   #83
enderak
 
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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.
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Old 2010-09-25, 10:20   #84
Jeff Gilchrist
 
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Even my older Pentium D machine when from 0.032 sec/iter down to 0.027 sec/iter.
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