Fast Mersenne Testing on the GPU using CUDA - Page 5

ixfd64 · 2011-01-12, 06:22

Any updates?

moebius · 2011-03-09, 05:00

I am very interested in the runtimes for a GTX560 Ti related to Phenom II 955, Linux64.
How many hours will it take to prove primality of M4264380 on it?
I would of course be available with this card for a test.

ckdo · 2011-03-10, 05:41

Quote:

Originally Posted by moebius

How many hours will it take to prove primality of M4264380 on it?

Saving you the heartache: It's not prime.

sdbardwick · 2011-03-10, 09:35

Just for clarification: 4264380 is not prime, so (2^4264380)-1 cannot be prime.

axn · 2011-03-10, 10:22

Quote:

Originally Posted by ckdo

Saving you the heartache: It's not prime.

Quote:

Originally Posted by sdbardwick

Just for clarification: 4264380 is not prime, so (2^4264380)-1 cannot be prime.

All this for a simple typo?

ckdo · 2011-03-10, 15:00

Quote:

Originally Posted by axn

All this for a simple typo?

Yes.

If moebius receives any time estimates for an exponent an order of magnitude smaller than the one he's (supposedly) interested in, they aren't gonna help him that much, either, so hinting at what happened seemed like a reasonable route to follow.

Mini-Geek · 2011-03-10, 15:10

Quote:

Originally Posted by ckdo

Yes.

If moebius receives any time estimates for an exponent an order of magnitude smaller than the one he's (supposedly) interested in, they aren't gonna help him that much, either, so hinting at what happened seemed like a reasonable route to follow.

Considering the intended exponent is pretty obvious, it would be better if we could just say something to the effect of:
"M42643801 would take X hours."
But the program isn't released, so nobody so far has really been able to answer it...

moebius · 2011-03-10, 19:20

Quote:

Originally Posted by sdbardwick

Just for clarification: 4264380 is not prime, so (2^4264380)-1 cannot be prime.

Too bad, I thought I had found the first even prime number ... haha

xilman · 2011-03-10, 19:39

Quote:

Originally Posted by moebius

Too bad, I thought I had found the first even prime number ... haha

ITYM the second even prime number. HTH, HAND.

Paul

moebius · 2011-03-10, 20:23

Quote:

Originally Posted by xilman

ITYM the second even prime number. HTH, HAND.

Paul

I do not think in such a trivial range of numbers.

Christenson · 2011-03-13, 04:37

Back to King Kurly's question: Which GPU should be in my future, assuming my budget is only $500 or so? 100GHz days per day makes my Phenom II x6 seem, well, puny!

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2011-01-12, 06:22	#45
ixfd64 Bemusing Prompter "Danny" Dec 2002 California 7⁴ Posts	Any updates?

2011-03-09, 05:00	#46
moebius Jul 2009 Germany 607 Posts	I am very interested in the runtimes for a GTX560 Ti related to Phenom II 955, Linux64. How many hours will it take to prove primality of M4264380 on it? I would of course be available with this card for a test.

2011-03-10, 09:35	#48
sdbardwick Aug 2002 North San Diego County 5×137 Posts	Just for clarification: 4264380 is not prime, so (2^4264380)-1 cannot be prime.

2011-03-13, 04:37	#55
Christenson Dec 2010 Monticello 5·359 Posts	Back to King Kurly's question: Which GPU should be in my future, assuming my budget is only $500 or so? 100GHz days per day makes my Phenom II x6 seem, well, puny!