20080916, 15:56  #1 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2^{3}·661 Posts 
Is it time for a 100M digit option?
In the same way that Prime95 currently allows us to:
"Choose 10,000,000 digit numbers to test" Does there now need to be an option to: "Choose 100,000,000 digit numbers to test" Sure it will take a LONG time but then my first 10M test 6 years ago took 15 months on my PIII400. Would the 100M tests take any longer than that on current hardware? OR as Mr. Silverman suggested in post #710 of the "BATMAN" thread, is it time to fill in the gaps? 
20080916, 16:03  #2 
Account Deleted
"Tim Sorbera"
Aug 2006
San Antonio, TX USA
10267_{8} Posts 
Prime95v25/PrimeNetv5 allow you to choose to search 100M digit candidates only. I think the default will still be to search the smallest firsttime that are available (assuming a fast computer), i.e. filling in the gaps.

20080916, 16:18  #3 
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
2^{3}·661 Posts 
My bad for not checking there first....

20080916, 17:27  #4 
6809 > 6502
"""""""""""""""""""
Aug 2003
101ร103 Posts
25306_{8} Posts 
I was hoping for a 100M TF option. BTW, how far would make sense and the settings for P1 (or ECM)?

20080917, 01:21  #5 
Dec 2003
Hopefully Near M48
2·3·293 Posts 
I think so. My test of M100,000,039 on one core of a desktop with Core 2 Duo E6700 will take over a year. Assuming that the amount of work required to complete a test is proportional to FFT size and proportional to the number of iterations, a test of M332,192,831 (the first Mersenne number above 100 million digits) would require over 11 times as much work. I think such a test would take at least 4 years on current hardware.

20080917, 04:41  #6  
Sep 2008
Krefeld, Germany
2×5×23 Posts 
Quote:
1 Thread: 0.586 sec. per Iteration = about 6 years 2 Threads: 0.318 sec. per Iteration = 3 Years, 4 Months 3 Threads: 0.258 sec. per Iteration = 2 Years, 8 Months 4 Threads: 0.202 sec. per Iteration = 2 Years, 1 Month. 

20080917, 05:05  #7 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
10096_{10} Posts 
Your memory chips are apparently good/fast. This is rather good scaling.
Would one expect to have no errors for 2 years on 4 cores? That is the question to ponder before embarking. That reminds me to look for the origins of a citation that I long remembered but now completely unsure. From some scifi novel... It goes like this  "Should we depart for Alpha Centauri next year and arrive there in 50,000 years, or should we wait for another 50 years and then get there in 25,000 years?" (don't nitpick about the exact numbers, though, ok?) Serge 
20080917, 08:48  #8  
Banned
"Luigi"
Aug 2002
Team Italia
43×113 Posts 
Quote:
Luigi 

20080917, 08:54  #9  
Undefined
"The unspeakable one"
Jun 2006
My evil lair
3×2,239 Posts 
Quote:


20080917, 09:18  #10  
Bamboozled!
"๐บ๐๐ท๐ท๐ญ"
May 2003
Down not across
5^{2}×7×67 Posts 
Quote:
Might not be economically viable though. Paul 

20080917, 09:22  #11 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
3×2,239 Posts 
Sure, but then what was the point of the first group leaving so early? they might as will hang around partying and then jump on the second ship when it leaves.

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