20211129, 14:43  #342  
Feb 2017
Nowhere
2×5^{2}×107 Posts 
Quote:
From the Fermat Search News page: Quote:


20211129, 15:24  #343  
"Mark"
Apr 2003
Between here and the
6,529 Posts 
Quote:


20211129, 16:02  #344 
Banned
"Luigi"
Aug 2002
Team Italia
11345_{8} Posts 
Whops SORRY!!!
Nov 24th, 2021 New Fermat factor from Gary Gostin and FermatSearch! 205071338665 . 2^{1382}+1 is a Factor of F_{1379}!!! Gary Gostin discovered the fifth Fermat factor of this year! This was discovered on an Intel i99900K CPU with an RTX 2080 GPU running a new GPUbased factoring program. We now have 360 Fermat factors known, one for each degree of the circle! Congratulations to Gary from FermatSearch! Last fiddled with by Dr Sardonicus on 20211129 at 17:15 Reason: xignif topsy 
20211129, 18:52  #345 
Banned
"Luigi"
Aug 2002
Team Italia
12E5_{16} Posts 

20211130, 04:30  #346 
"Gary Gostin"
Aug 2015
Texas, USA
67 Posts 
The program is called “gfs” for GPU Fermat Search. It is a “Sieve + Trial Division” program that supports integers (trial divisors) up to 2046 bits and can search for factors of either Fermat numbers only or of Fermat numbers and GFNs (a^2^n + b^2^n). The sieve is performed by all cores of the CPUs, in parallel with the trial division calculations which are performed on the GPU. The program has 62 CUDA assembly libraries, one for integers of each multiple of 32 bits in size from 96 to 2048 bits. The libraries are generated by a separate program and contain a total of > 150K lines of CUDA assembly. As Luigi mentioned, gfs is still in development with a long list of tasks / issues to address. So far it has only been tested on Ubuntu with Pascal and Turing GPUs. Performance is currently 10x – 2x slower than mmff for 40 <= n <= 200, 40% to 20% faster than Feromantcuda for 200 <= n <= 600, and 30x to 6x faster than pmfs for 600 <= n <= 2000. (for each comparison performance vs n is ordered: 10x @ 40 increasing to 2x @ 200, etc).
Thanks! Last fiddled with by Gary on 20211130 at 04:35 
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