20200508, 23:26  #1882  
Jun 2012
2×3×491 Posts 
Quote:
https://www.mersenneforum.org/showpo...9&postcount=74 I’m working c5 < 1M, using msieveGPU. Any help welcome! 

20200509, 00:15  #1883  
"Ed Hall"
Dec 2009
Adirondack Mtns
2·3^{2}·197 Posts 
Quote:


20200509, 14:57  #1884 
"Ed Hall"
Dec 2009
Adirondack Mtns
6732_{8} Posts 
I'm sure this is a poor poly, but am I on the right track?
Code:
skew: 23193644.637 c0: 27677017276391468847497030636368115901471780 c1: 10552743874205252207093977517839426343 c2: 1210164270654515308018946622990 c3: 43735071840910583726351 c4: 886925003073138 c5: 6165600 Y0: 120879887180705227225827835478045022 Y1: 1217953568360884501991 # MurphyE (Bf=4.295e+09,Bg=2.147e+09,area=2.416e+16) = 1.110e08 # f(x) = 6165600*x^5886925003073138*x^4+43735071840910583726351*x^3+1210164270654515308018946622990*x^210552743874205252207093977517839426343*x27677017276391468847497030636368115901471780 # g(x) = 1217953568360884501991*x120879887180705227225827835478045022 Code:
Best Skew: 31354947.23598 . . . 31354947.23598 5.51074631e14 . . . 
20200509, 16:01  #1885  
"Curtis"
Feb 2005
Riverside, CA
3×1,543 Posts 
Quote:
I'd guess 6.5e14 is a good goal for this composite, and a 7 would not surprise me. 

20200509, 18:11  #1886 
Jun 2012
B82_{16} Posts 
C182
I got a decent poly searching down low with msieveGPU
Code:
n: 26521232090195873108384905824300492852413283081683568418163219479089273132380406501680155963531361683795706304607082425988301635509432877463621844114521741860720947862338201013214619 # norm 1.051570e17 alpha 9.121892 e 6.462e14 rroots 5 skew: 148988649.66 c0: 6813699213478967095358229786320166183214771200 c1: 534615773158213719542512689605226366504 c2: 9522073202739549597183040910818 c3: 51164897082315737549521 c4: 420892801747988 c5: 965712 Y0: 122390924023389854749571531023242691 Y1: 2233936328262373 Threshold: 6.28e14 Objective: > 7.23e14 Best found to date: 6.732e14 Searching 810M next using msieveGPU 
20200509, 21:24  #1887 
"Ed Hall"
Dec 2009
Adirondack Mtns
DDA_{16} Posts 
Thanks Guys!
I've got another run going. I had to adjust some scripts. I couldn't get a Colab GPU session compiled. I thought I had made the necessary changes, but I need to go look through some threads to see if I missed something. How do you derive threshold and objective? 
20200509, 21:55  #1888 
Jun 2012
2·3·491 Posts 
It’s output by msieve at the start of poly search. They are hard coded values based on GNFS difficulty. Finding a poly with a score above threshold is “good enough” to start sieving in most circumstances.
In this case, I mentioned this composite in the thread for finding better CADO parameters in case that work went beyond C180. We now have a baseline for a C182, if the work continues. But even though the poly found is above threshold, it was found in < 60 hours by msieveGPU. CADO can probably do much better. Heck, even msieveGPU will likely keep finding better polys with higher search ranges for c5. So I’ll go on searching until it’s clearly counterproductive. Think we can find a 7handle? 
20200509, 22:11  #1889  
"Ed Hall"
Dec 2009
Adirondack Mtns
2·3^{2}·197 Posts 
Quote:
See what you did by putting my name on a list? Last fiddled with by EdH on 20200509 at 22:12 Reason: Added two letter missing word  identification of which word is left as an exercise. . . 

20200510, 02:17  #1890 
"Curtis"
Feb 2005
Riverside, CA
3·1,543 Posts 
I can't let a poly search just sit there with others having all the fun.
Taking 1415M on CADO with incr=2310, P=3M, nq=15625. That's about 3% of a full search, just to see what turns up. 
20200510, 02:54  #1891 
"Ed Hall"
Dec 2009
Adirondack Mtns
2×3^{2}×197 Posts 
Earlier today I started a default CADONFS run with the minor machines here. I expect to add the major machines when they finish sieving. How does my default run affect your 1415M area? Is it full duplication, or is there enough randomness to not worry? I left everything at the values in your modified params.c180.

20200510, 04:51  #1892 
"Curtis"
Feb 2005
Riverside, CA
3×1,543 Posts 
I believe the default settings only go to 23M; I went for 14M to avoid any duplication.
That said, I used admin 14e6 and admax 15e6; after running all the workunits, it thinks it is 99.6% done and won't proceed to rootopt. I've tried changing admax to a multiple of 2310, changing admax to far below 15e6 so that it is clearly more than 100% done, and tried setting admin/admax/adrange all to zero to try to force it to finish sizeopt, no joy. So, I guess I won't be providing a poly for this after all. 
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