20191103, 14:54  #12 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
3·2,281 Posts 
So, the ~30% performance loss in grmfaktc relative to mfaktc means Mersenne factorers should stick with the mainstream mfaktc.

20191103, 15:02  #13 
Mar 2011
Germany
141_{8} Posts 
For now yes. At a later point I might create a version that uses the original code path for Mersenne primes, probably once I have included negative bases...

20191105, 13:32  #14 
Random Account
Aug 2009
Not U. + S.A.
2331_{10} Posts 
Something I was thinking about late yesterday evening: Below is a line from your work example file in the archive.
Code:
Factor=base=10,1055167,1,64 
20191105, 21:22  #15  
Mar 2011
Germany
97 Posts 
Quote:
The search boundaries are always a power of 2. Last fiddled with by MrRepunit on 20191105 at 21:22 

20191113, 18:49  #16 
Jul 2003
2·307 Posts 
hi,
i tried out grmfaktc0.21 with base=6, n=600k to 1000k on a gtx1050ti and the performance is good 
20191113, 20:44  #17  
Mar 2011
Germany
97 Posts 
Quote:
Code:
Stages=0 Code:
GPUSieveSize=8 Last fiddled with by MrRepunit on 20191113 at 20:44 

20191113, 20:57  #18 
Jul 2003
266_{16} Posts 
hi,
i think that i need stages=1 because i do use StopAfterFactor=2 in mfaktc.ini 
20191116, 15:31  #19  
Random Account
Aug 2009
Not U. + S.A.
100100011011_{2} Posts 
Quote:
Code:
Factor=N/A,96751147,73,75 

20191213, 14:48  #20  
Random Account
Aug 2009
Not U. + S.A.
4433_{8} Posts 
Quote:
Question: Would you be willing to do a custom build for a single individual? 

20191215, 00:15  #21  
Mar 2011
Germany
97 Posts 
Quote:
But anyway, let me know what you need... 

20191215, 01:18  #22  
Random Account
Aug 2009
Not U. + S.A.
3^{2}×7×37 Posts 
Quote:
An example: I have a very old factoring program called Factor5. It uses the CPU only. A while back, I gave it a small exponent, M1619 I believe it was. Start and end bits in the mid 60's. It stayed at 0.000% for 20 minutes or so before it changed. I did the math to 100%. Hundreds of years, or maybe thousands. So, it would not be anywhere near practical to do anything like this, even with a GPU. 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
mfaktc: a CUDA program for Mersenne prefactoring  TheJudger  GPU Computing  3541  20220421 22:37 
mfakto: an OpenCL program for Mersenne prefactoring  Bdot  GPU Computing  1684  20220419 20:25 
The P1 factoring CUDA program  firejuggler  GPU Computing  753  20201212 18:07 
World's seconddumbest CUDA program  fivemack  Programming  112  20150212 22:51 
World's dumbest CUDA program?  xilman  Programming  1  20091116 10:26 