20210829, 02:48  #496 
Jul 2003
So Cal
2^{2}·547 Posts 
Overnight last night I ran stage 1 on 2560 curves with B1=85e7 using the new gpu ecm using CGBN. I have stage 2 on those distributed across 8 nodes right now, and I'm running another 2560 stage 1's on the gpus.

20210901, 17:17  #497 
Apr 2020
499_{10} Posts 
Is there still a need for more ECM here, or is Greg doing all the 850M curves?

20210901, 19:33  #498 
"Oliver"
Sep 2017
Porta Westfalica, DE
654_{10} Posts 
Besides the curves from frmky in #496 I do not know of anyone other than me who did some. We overshot the goal suggested by VBCurtis with 30k curves @ 260M, so I guess we need less 850M curves than he suggested. If frmky's curves are done, together with mine we are only at ~7k curves here. So there could certainly be done more, if you like.
Last fiddled with by kruoli on 20210901 at 19:35 Reason: Clarifications. 
20210901, 20:01  #499 
Jun 2012
3,203 Posts 
I have completed 6432 of my committed 10000 curves @B1=260M. Seeing we’ve already overshot the target amount of ECM at t60, would it be better for me to cease that work and do say 1000 curves @B1=850M?
Sean 
20210901, 20:38  #500 
Jul 2003
So Cal
2^{2}×547 Posts 
I have run a total of 10240 curves at B1=850M with no factor found.
Last fiddled with by frmky on 20210901 at 20:39 
20210901, 21:09  #501  
Jun 2012
110010000011_{2} Posts 
Quote:
ETA: I can help with the poly search if needed. Last fiddled with by swellman on 20210901 at 22:25 

20210902, 08:55  #502 
"Oliver"
Sep 2017
Porta Westfalica, DE
654_{10} Posts 
Since we were discussing whether to use CADO or NFS@home, does it make a difference which poly selection to use? (IIRC, CADO yields better polynomials on CPU but has no GPU port.) With a CADO server, it would automagically distribute polyselect working units, correct?
For a few c140c150, I experimented in the past with polynomial selecting on msieve and using that result in CADO, resulting every time in an LA phase taking around 50 % of the computation time, so decided to stop experimenting until I get a better understanding of everything. We are looking at around 1000 core days of polyselect, right? For about five days already, I have been running GPU polyselect on a lousy 1030. The resulting polynomial was abominable. I guess the badness of the poly above at least does make sense... Code:
R0: 1914165953547080696287480071699336060476 R1: 4996785037918941149 A0: 5557784762717745111741234027368983334161163620943009595 A1: 709924490299956872317450962824671796034061769 A2: 176580573731696825434979940746709615 A3: 839292886902290685831381 A4: 483459688232660 A5: 5100 skew 20143410012.87, size 8.676e20, alpha 9.773, combined = 3.745e15 rroots = 5 
20210902, 11:06  #503 
Jun 2012
3,203 Posts 
I don’t think the siever “cares” where the poly was generated. For a c201 I would use CADO for a degree 5 poly search.
Sieve it by ggnfs or CADO, either will work. If you’re looking for assistance with the search, I hereby reserve a range of 510M using CADO. 
20210902, 12:58  #504 
Aug 2020
79*6581e4;3*2539e3
3·7·19 Posts 
I could also do a 1M range. Should the same parameters be used as for the c220 search just with an nq of 5^n?

20210902, 13:28  #505  
Apr 2020
499 Posts 
I've done 2400 curves at 850M, no factor.
I think the CADO default of P=10M for c200 is probably too big: Curtis's optimized c195 polyselect parameters have P=3M. I'll do 05M with P=5M, nq=15625, incr=420, sopteffort=10, ropteffort=100. Quote:


20210902, 14:18  #506  
Jun 2012
3,203 Posts 
Quote:
As charybdis points out, P should probably be lower. I’m using P=8M, but that’s maybe a touch high. Last fiddled with by swellman on 20210902 at 14:18 

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