20220715, 19:01  #34  
P90 years forever!
Aug 2002
Yeehaw, FL
3×5^{2}×107 Posts 
Quote:
11285 × ( 950 + 293.4 ) = 14,031,769 This is not best configuration for this computer though. The fact that only one core is used during stage 1 is a big issue. 

20220715, 23:19  #35 
"GIMFS"
Sep 2002
Oeiras, Portugal
2^{3}×3×5×13 Posts 

20220716, 02:40  #36 
P90 years forever!
Aug 2002
Yeehaw, FL
3·5^{2}·107 Posts 
Best setup for you is likely 4 workers an MaxHighMemWorkers set to 2

20220716, 17:37  #37 
Einyen
Dec 2003
Denmark
2^{3}·3^{2}·47 Posts 
Here are some tests with the old Core i75960X with 24000MB RAM for Prime95, only using 1 core for both Stage 1 + 2, since I was not sure what number of cores was best to test with in Stage 2, and if multiple cores did much difference at these ultra low FFTs.
The ones with "*" is the auto chosen B2 values. Is there any value in doing more tests with this old CPU ? Like T50, T45, etc. or tests with more cores in Stage2 or different amounts of RAM? Code:
Actual GMPECM B1 B2 B2 B2/B1 RAM(MB) curves Curve time Total Txx time  M2719T65 800M 8e11 8.2978e11 1037 3124 116870 5563s + 61s 182577 h M2719T65 800M 8e12 8.045e12 10057 11772 81086 5563s + 221s 130278 h *M2719T65 800M 5.04656e13 63082 23542 61656 5563s + 684s 109465 h M2719T65 800M 8e13 8.411e13 105138 23542 57270 5563s + 1035s 104963 h M2719T65 800M 2.4e14 2.51416e14 314270 21644 48983 5563s + 1694s 98742 h M2719T65 800M 8e14 8.411e14 1051375 22023 40963 5563s + 3487s 102976 h M6073T60 260M 2.6e11 2.6796e11 1031 4686 62444 3598s + 74s 63693 h M6073T60 260M 2.6e12 3.1039e12 11938 14570 42901 3598s + 306s 46524 h *M6073T60 260M 1.50228e13 57780 22957 32933 3598s + 774s 39995 h M6073T60 260M 2.6e13 2.7935e13 107443 23036 30158 3598s + 1141s 39700 h M6073T60 260M 7.8e13 8.411e13 323500 22682 25965 3598s + 2478s 43823 h M6073T60 260M 2.6e14 2.73764e14 1052939 19984 21807 3598s + 4927s 51640 h M10303T55 110M 1.1e11 1.2416e11 1129 4362 25075 2228s + 78s 16062 h M10303T55 110M 1.1e12 1.1174e12 10158 14451 16758 2228s + 294s 11740 h *M10303T55 110M 4.34546e12 39504 22945 13511 2228s + 689s 10947 h M10303T55 110M 1.1e13 1.2018e13 109257 22913 11712 2228s + 1150s 10990 h M10303T55 110M 3.3e13 3.3644e13 305855 21090 10000 2228s + 2229s 12381 h M10303T55 110M 1.1e14 1.2456e14 1128691 23596 8373 2228s + 5225s 17334 h Last fiddled with by ATH on 20220716 at 17:59 
20220717, 02:17  #38  
P90 years forever!
Aug 2002
Yeehaw, FL
1111101011001_{2} Posts 
Quote:
BTW, interesting to see the optimal B2/B1 is dropping as exponents get larger and t# gets lower. My earlier statement of B2/B1 > 1000 not being valuable may have been correct in the M900000 area I tried but is clearly wrong for these small exponents. 

20220717, 18:55  #39 
Feb 2012
the Netherlands
61 Posts 
I like to do ECM, so gave 30.9b1 a go, got a factor on the very first exponent!
Code:
Factor: 352867573711979454617014177 / (ECM curve 242, B1=50000, B2=38914785, Sigma=861408202433943) Last fiddled with by Stef42 on 20220717 at 18:57 
20220718, 13:19  #40 
Jun 2003
2^{2}·7·193 Posts 
Another success:
Code:
ECM found a factor in curve #1, stage #2 Sigma=3154775547629108, B1=250000, B2=235419030. UID: axn/c1, M903407 has a factor: 1066347780167947196737336563937 (ECM curve 1, B1=250000, B2=235419030) 
20220718, 18:44  #41 
P90 years forever!
Aug 2002
Yeehaw, FL
3·5^{2}·107 Posts 

20220718, 18:54  #42 
Bemusing Prompter
"Danny"
Dec 2002
California
2^{4}×5×31 Posts 
Am I correct to assume this is based on the new stage 2 implementation that doesn't support the Brent–Suyama extension?

20220719, 01:22  #43 
P90 years forever!
Aug 2002
Yeehaw, FL
3·5^{2}·107 Posts 

20220721, 14:24  #44 
Jun 2003
2^{2}·7·193 Posts 
Couple of hits in quick succession:
Code:
ECM found a factor in curve #17, stage #2 Sigma=3692827876263630, B1=250000, B2=235419030. UID: axn/c2, M905621 has a factor: 11139426256343765204839823 (ECM curve 17, B1=250000, B2=235419030) Group Order: 2^3 · 3 · 89 · 4349 · 73819 · 75437 · 215337467 ECM found a factor in curve #14, stage #2 Sigma=6883129626396355, B1=250000, B2=235419030. UID: axn/c3, M905629 has a factor: 875812073686928536845781855983559 (ECM curve 14, B1=250000, B2=235419030) Group Order: 2^4 · 3^2 · 13 · 673 · 37337 · 39397 · 43961 · 157733 · 68154937 
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