20120810, 05:38  #628  
"Lucan"
Dec 2006
England
194A_{16} Posts 
Quote:
Time taken to LL is proportional to exponent^{2}. So probability/year of finding a prime is proportional to 1/exponent^{3}. Humble toilers such as myself like these plums, and resent them being reserved for Chalsall's Chums. Look after the waveFRONT speed, and let the tail look after itself. If Primenet can't exploit GPUs properly yet, it should retire all the hoarded TF assignments >53M. D 

20120810, 10:48  #629 
"Lucan"
Dec 2006
England
2·3·13·83 Posts 

20120810, 14:01  #630 
P90 years forever!
Aug 2002
Yeehaw, FL
2×17×241 Posts 
Some of your erato.cu optimizations are also in my GPU sieving code. I guess that also makes you one of the two dozen or so that have contributed actual working code  thanks! PM me, if you'd like a copy of the new sieve code to see if you can find some more microoptimizations.

20120812, 06:42  #631  
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2×5,471 Posts 
Quote:
All exponents below 41,060,057 have been tested at least once. Countdown to testing all exponents below M(42643801) once: 13 Countdown to testing all exponents below M(43112609) once: 18 Countdown to proving M(25964951) is the 42nd Mersenne Prime: 70 Countdown to proving M(30402457) is the 43rd Mersenne Prime: 28,626 It looks like 3 of these milestones will get retired by the end of 2012. 

20120812, 13:34  #632 
May 2004
New York City
5·7·11^{2} Posts 
GIMPS is close to testing all Mersenne numbers up to 2^431126091,
which will eventually prove that M47* = M47. As long as we have no proof that the Mersenne Primes are infinite in number, continuing the search beyond any given limit such as M47 is of course interesting but unbounded. Hence my question: is there any way to measure the probability that M47 is the last Mersenne Prime? 
20120812, 13:34  #633 
Aug 2002
Termonfeckin, IE
2768_{10} Posts 
A few observations:
1. The pfrakes exponent that chalsall linked to above is most likely the same user testing it twice. I suspect this was because the firsttime test was done in v4 and the second time test done in v5 and v5 does not remember the v4 IDs for checking if the same user returned two LLs for the same test. Also, George has a second check  the shift count  and if both results are submitted using Prime95 it becomes very hard  if not impossible  to fake these. 2. George's reply on what GPU72 has done for us is pretty much to the point. I would just like to point out that I am one of those who runs his own script periodically to get plum DCs and I found that I was able to get what I wanted even when GPU72 was grabbing exponents. I do think George's idea of leaving 1 mod 4 or even just 1 mod 4n where n>1 exponents for nonGPU72 users is a good idea. 3. My count of exponents between 2526M is now 23/72. So I am keeping with the pace. 
20120812, 16:20  #634  
Oct 2011
7·97 Posts 
Quote:
xx,xxx,801  10.90% on 5/9, 11.00% on 8/12 xx,xxx,607  61.20% on 4/8, 61.20% on 5/7, reassigned on 5/9, no progress to date. 

20120812, 21:14  #635 
Einyen
Dec 2003
Denmark
6566_{8} Posts 
Since you are following this thead, I want to ask: Do you plan to implement any assignment recycling rules like these or similar?: http://www.mersenneforum.org/showpos...&postcount=443
I think it would be nice with something preventing assignments for getting stuck and running 2+ years with little progress. Last fiddled with by ATH on 20120812 at 21:16 
20120813, 01:06  #636 
P90 years forever!
Aug 2002
Yeehaw, FL
2·17·241 Posts 

20120813, 01:38  #637 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 

20120813, 02:37  #638 
If I May
"Chris Halsall"
Sep 2002
Barbados
5×2,237 Posts 

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