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Old 2011-10-11, 18:40   #45
MrHappy
 
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28.0M - 32.0M is already at 68 bits and most exponents up to 28M are assigned for TF or DC so if 68 bits is the breakeven point we are almost done in the current DC range.
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Old 2011-10-11, 18:47   #46
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If someone else can chime in with their numbers we can be more sure of that. BTW my 40min estimate was for 24M as was the LL-DC estimate. The post above has been revised to reflect that. My guess is that 69 might be good for 28Ms but not for 25Ms. Hard numbers anyone else?

Last fiddled with by garo on 2011-10-11 at 18:49
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Old 2011-10-11, 23:03   #47
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Read the two copious threads on this subject in the Lounge
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Old 2011-10-12, 03:12   #48
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A lucky number from ckdo -- another LL test no longer needed:
found 1 factor(s) for M27775613 from 2^67 to 2^68 [mfaktc 0.17 barrett79_mul32]
tf(): total time spent: 35m 24.609s

Hardware: GT440 at 55M candidates/sec, sieveprimes 28803 with one core of an AMD Phenom II x6 running 64-bit xubuntu 10.10.

I got a 38 hour run time for an LL test at 25,4xx,xxx on a GT480 I use, but will have to wait a bit to upload mersarch.txt. It was not and still is not running mfaktc again.

Others here can *beat* (or run circles around) me...

Garo, don't forget to factor in the core that is feeding pseudoprimes to mfaktc....what's your value of sieveprimes?
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Old 2011-10-12, 05:38   #49
Dubslow
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Quote:
Originally Posted by Christenson View Post
A lucky number from ckdo -- another LL test no longer needed:
found 1 factor(s) for M27775613 from 2^67 to 2^68 [mfaktc 0.17 barrett79_mul32]
tf(): total time spent: 35m 24.609s

Hardware: GT440 at 55M candidates/sec, sieveprimes 28803 with one core of an AMD Phenom II x6 running 64-bit xubuntu 10.10.

I got a 38 hour run time for an LL test at 25,4xx,xxx on a GT480 I use, but will have to wait a bit to upload mersarch.txt. It was not and still is not running mfaktc again.

Others here can *beat* (or run circles around) me...

Garo, don't forget to factor in the core that is feeding pseudoprimes to mfaktc....what's your value of sieveprimes?
No kidding. I can do that assignment in 13-14 minutes.
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Old 2011-10-12, 07:48   #50
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I do four such assignments every 22 minutes with the GPU not even saturated. Still, every contribution is valued. 101 mph...
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Old 2011-10-13, 00:03   #51
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Wait, what are you using?
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Old 2011-10-19, 20:05   #52
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If I remember a previous comment correctly, CKDO has a GTX5xx with a big number, possibly 80, filling the last two digits.
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Old 2011-10-19, 22:42   #53
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And I keep salivating over one of those...A GT580....but I was cheap about my GT440, only spent a hundred bucks or so, and the 580 costs probably half a grand....
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Old 2011-10-20, 00:49   #54
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Quote:
Originally Posted by Christenson View Post
And I keep salivating over one of those...A GT580....but I was cheap about my GT440, only spent a hundred bucks or so, and the 580 costs probably half a grand....
I feel very fortunate that I picked up a GTX460 for about a hundred (after rebate). But I do need to send the rebate stuff off, or not get the 30 bucks back.
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Old 2011-11-28, 05:39   #55
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Quote:
Originally Posted by MrHappy View Post
Hi folks!

I want to propose some well-defined mini-projects or tasks and a combined approach to finish/achieve it, some selfmade milestones... with the overall goal of speeding up GIMPS in the present or near future...
like: no DC should be handed out without TF-attempts up to the 69 bit level.
or: same with LL up to the XX bit level
but not: Let's do the 600M range up to 80 bit! (no offense! that is fun too!)

It's the same we do now, but with a team and a goal...
Thanks to chalsall, this has been implemented! Woooooooooo!
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