20190730, 02:49  #1 
Mar 2004
509 Posts 
I think I need to factor some more
I have two 100M digit mersennes that it was suggested should be prefactored deeper than they are so far. Both of them look like this:
Code:
PRP=HEX,1,2,EXPONENT,1,77,2 
20190730, 03:45  #2 
Apr 2019
CD_{16} Posts 
100M digit numbers would be in the exponent range of around 332million.
mfaktc, using CUDA/Nvidia gpu can TF exponents up to roughly 4.2billion (2^32). If you have AMD gpu, you can use mfakto (not sure if it has exact same limit). If you have a decent GPU, this is a good use for it to run concurrently with prime95, since it uses very little CPU. edit: also I'm not sure if that's true Prime95 not handling TF for that. As far as I knew it works on any exponent up to 1 Billion, but I have not tried it. (Primenet certainly tracks factoring up to 1B at least). Last fiddled with by hansl on 20190730 at 03:49 
20190730, 04:32  #3  
Mar 2004
509 Posts 
Quote:
//Edit re Prime95 not taking care of it, what I was told was Prime95 is 80x slower on that and that it doesn't bother anymore. Last fiddled with by JuanTutors on 20190730 at 04:34 

20190730, 04:41  #4  
Apr 2019
5·41 Posts 
Quote:
https://www.mersenne.ca/status/tf/0/0/3/33000 Last fiddled with by hansl on 20190730 at 04:42 

20190730, 05:38  #5 
Jul 2014
3·17 Posts 
i can run TF on a gpu upto 81bits for you.
it will take about a day for each. you can run LL or PRP while i do TF PM me or post the exponents 
20190730, 15:11  #6  
Mar 2004
509_{10} Posts 
Quote:
I don't remember what my brand new laptop has but I won't be taxing that one too much ... too expensive ($3000). I don't want to risk any damage. Last fiddled with by JuanTutors on 20190730 at 15:11 

20190730, 17:04  #7 
Apr 2019
5×41 Posts 
You can try mfakto (the "o" is for OpenCL), if those chips have suppor for it. Intel graphics have not been as widely tested with mfakto, compared to Radeon/AMD, but it might work. Just keep in mind that integrated graphics are on the same die as cpu, so thermals may be even more of a concern if running alongside prime95.

20190730, 22:17  #8  
Mar 2004
509 Posts 
Quote:
Code:
 Use the VS2010 solution to build the 32bit or 64bit binary, or  use the Makefile to build using MinGW and gcc 

20190730, 22:44  #9 
Apr 2019
5×41 Posts 
If you don't know what that means (two different ways of compiling from source), I would recommend trying a prebuilt release, such as from here:
https://download.mersenne.ca/mfakto/mfakto0.15pre6 
20190803, 16:27  #10  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
5,113 Posts 
Quote:
Not sure why you enjoy wasting other forum users' time. 

20190803, 17:48  #11 
Einyen
Dec 2003
Denmark
2·5·313 Posts 
I factored his exponents to 2^81.

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