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Old 2011-10-08, 02:34   #23
Christenson
 
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You do know that a given TF bit level gets easier as the size of the exponent increases, because only factors of form 2kp-1 are considered, where 2^p-1 is the number we are trial factoring.

If using P95, I believe you can do a DC yourself, because of the randomisation of the data. But CUDALucas might be quicker....
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Old 2011-10-08, 03:01   #24
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Just got a week of TF-DC assignments. Early judgement indicates I can knock out quite a few DC's.
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Old 2011-10-08, 04:43   #25
LaurV
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Quote:
Originally Posted by Christenson
because only factors of form 2kp-1 are considered, where 2^p-1 is the number we are trial factoring
2kp+1
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Old 2011-10-10, 02:28   #26
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In about a day, maybe a bit more of work, going from 67 to 68, I've knocked out 2 exponents already. Quite a bit faster than DC, even on CUDALucas. That's 1 factor a day going to 69 bits, so that is still faster than the DC on CUDALucas (around 2.5 days on my card).

(Incidentally ckdo, as of 20 mins ago (already one unreported assignment done) I've reported all results up to and including M25494233.)

Last fiddled with by Dubslow on 2011-10-10 at 02:29
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Old 2011-10-10, 02:30   #27
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Dang. After finishing the previous post, I checked that one unreported assignment I mentioned. Turns out it found a factor. So that's 3 in around a day.
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Old 2011-10-10, 02:38   #28
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Just counted. In around 20 +/- 1 hr, I've reported 91 results, with 2 factors found, or if you add an hour, 3 factors in 95 candidates.
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Old 2011-10-10, 04:11   #29
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Quote:
Originally Posted by Dubslow View Post
Just counted. In around 20 +/- 1 hr, I've reported 91 results, with 2 factors found, or if you add an hour, 3 factors in 95 candidates.
That's the statement that we need to do one or two more bit levels or so on the range you are working, before returns diminish to the point where it's better to do LL testing.

Remember that we can ask your card to do a DC with CUDAlucas at the same time we can ask a core to do it, so 1.25 days per single factor for you is the optimum, the point of indifference.

Keep up the good work!
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Old 2011-10-10, 05:15   #30
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Well, actually my card's at about 90% on mfaktc, running CUDALucas at the same time would slow them both down quite a bit
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Old 2011-10-10, 08:13   #31
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Quote:
Originally Posted by MrHappy View Post
26M: 21387 at 67 bit (only 7158 still needing a DC)
27M: 11719 at 67 bit and 9902 at 68
28M: 21421 at 68 bit

54M-59M: 3631 at 68 bit and 17646 at 69 bit
26M: 21353 at 67 bit (only 7101 still needing a DC)
27M: 11303 at 67 bit and 10305 at 68
28M: 21051 at 68 bit

54M-59M: 3405 at 68 bit and 16785 at 69

Can someone easily get the TF-Depth for exponents in a range that are not DCed already?
Like: in 27M range XXX are at 67 bit and have no DC-LL and YYY at 68 bit ...
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Old 2011-10-10, 15:21   #32
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Quote:
Originally Posted by MrHappy View Post
Can someone easily get the TF-Depth for exponents in a range that are not DCed already?
Nope.

For the sake of it, here's the count of exponents in my TF pool, by range:

Code:
25M:  583 @ 67
26M: 2392 @ 67
27M: 1612 @ 67
28M: 6313 @ 68
That will keep the gang busy until late November at yesterday's rate.
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Old 2011-10-10, 17:39   #33
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On the subject of TF, I'm surprised that George hasn't added GPU support to Prime95 yet. I mean, the code (mfaktc, etc.) is already available, so what is he waiting for?
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