20190520, 20:14  #1 
"Curtis"
Feb 2005
Riverside, CA
2^{2}×23×47 Posts 
Poly select and planning for 2,2330M
Poly select and ECM have finished for 2330L, so we're on to begin factorization of 2330M:
Code:
201916700580745604776027022665471186255107062245932082076863383752096343903385041484073267281054478199044604641397575671739630499971150912819790916215008125554106571022882316742647109864486081319721103021177161 On 2330L, Vebis did extensive CADO searching. He found a deg 6 at 1.94e15, and deg 5 at 1.76e15 (both after Max' spin efforts, which even he found lucky). Vebis also found a 1.65e15 with CADO, which was not significantly changed by spin (1.66 best, I believe). Vebis' efforts were close to 4 coreyears of poly select!!! By traditional measures, too much; however, he did deg 6 first and then learned that we expected deg 5 to be better, so repeated his search on deg 5. msieveGPU deg 5 produced quite a few hits in the 1.40's, none of which spun into 1.60s so none were testsieved. This C210 is roughly 50% harder than the C207 of 2330L. Poly scores around 1e15 deg 5 before spin are good hits, 1.1e15 for deg 6. The record score is deg 6, found by the CADO team for RSA210, at 1.49e15. The CADO folks indicate deg 6 is preferred for this composite size, but experience in msieve is that deg 5 is more likely to produce a better poly. So, I suggest CADO folks aim at deg 6, msievegpu folks at deg 5. Naturally, anyone can do what they like, and any software/degree combo surely can produce the winning polynomial. As always, please post your search range to this thread before you search, to reduce overlapping efforts among contributors. Last fiddled with by VBCurtis on 20190520 at 20:25 
20190522, 22:52  #2 
"Curtis"
Feb 2005
Riverside, CA
2^{2}·23·47 Posts 
I am poly selecting with CADO: deg 5 admin 10M admax 20M with nq = 15625 and incr = 4620. These are the settings that produced the best prespin score from Vebis' work on 2330L.
It'll be a few days. 
20190523, 13:40  #3 
"Dylan"
Mar 2017
2·257 Posts 
I'll do some polyselect as well on CADO, with the following parameters:
Code:
tasks.polyselect.degree = 5 tasks.polyselect.P = 10000000 tasks.polyselect.admin = 20e6 tasks.polyselect.admax = 25e6 tasks.polyselect.adrange = 4620 tasks.polyselect.incr = 4620 tasks.polyselect.nq = 15625 tasks.polyselect.nrkeep = 120 tasks.polyselect.sopteffort = 20 tasks.polyselect.ropteffort = 0 #Max can handle the spinning tasks.wutimeout = 86400 # one day Last fiddled with by Dylan14 on 20190523 at 14:23 Reason: realizing my mistake 
20190523, 15:17  #4 
"Curtis"
Feb 2005
Riverside, CA
4324_{10} Posts 
I believe the "long time" is caused by sopteffort set to 20. If you delete that, you should be OK. I'm running 4threaded without specifying sopteffort and a 10M range is going to take around 6 days, so your reservation would be around 12threaddays (I'm using all hyperthreads of an i7, so a nonHT machine would be about half this time).
Also, note that adrange = incr means there is just one c5 value to test in each workunit, but default workers are 2threaded. If you use adrange = 4 * incr = 18480 the workers will balance better and more fully utilize the threads allocated. 
20190523, 16:52  #5 
"Dylan"
Mar 2017
2·257 Posts 
Ok, I have removed the sopteffort line and adjusted adrange in my params file and I will carry on with the reservation. I'm running it on a i56400 (4c, 4t) which is also running mmff, so I will keep you posted on progress.
By the way, this is the largest number that I have tried to find a poly for. 
20190523, 21:30  #6 
"Curtis"
Feb 2005
Riverside, CA
2^{2}·23·47 Posts 
I appreciate your effort to help out, Dylan!

20190525, 22:58  #7 
"Dylan"
Mar 2017
2×257 Posts 
Search completed on CADO deg 5, 20M25M. Here is the best poly I found:
Code:
n: 201916700580745604776027022665471186255107062245932082076863383752096343903385041484073267281054478199044604641397575671739630499971150912819790916215008125554106571022882316742647109864486081319721103021177161 skew: 315989367.585 c0: 8270680653880308830460607153894875173790667310385 c1: 3222328796747943800553552491255403933558589 c2: 381701881608412474793873349117993 c3: 763777506196945863233850109 c4: 111143744685556902 c5: 685460160 Y0: 24977029893574927325366834708458313140408 Y1: 1847059793854092133595999 # MurphyE (Bf=3.436e+10,Bg=1.718e+10,area=5.369e+15) = 2.59e08 # found by revision 50ad0f1fd # f(x) = 685460160*x^5111143744685556902*x^4763777506196945863233850109*x^3381701881608412474793873349117993*x^2+3222328796747943800553552491255403933558589*x8270680653880308830460607153894875173790667310385 # g(x) = 1847059793854092133595999*x24977029893574927325366834708458313140408 
20190525, 23:24  #8 
"Curtis"
Feb 2005
Riverside, CA
2^{2}×23×47 Posts 
cownoise says:
skew 239563346.43219 score 8.00005243e16 I'll have a poly Tuesday. 
20190527, 13:31  #9 
Apr 2010
3·47 Posts 
My first poly:
Code:
# norm 1.289220e20 alpha 8.622866 e 9.745e16 rroots 5 skew: 333353621.30 c0: 1330621012689673651205516325031368291157533624229440 c1: 2801419174198604069043508544608185474604632 c2: 68749078877640382414219776780695762 c3: 78231304031873583067593517 c4: 859938876210389022 c5: 202161960 Y0: 15845084526885064580819079083140525077823 Y1: 224396622703251576439 
20190527, 13:39  #10  
Jun 2012
5×571 Posts 
Quote:


20190527, 14:23  #11  
Apr 2010
3·47 Posts 
Quote:
I'm still trying to find the best stage1_norm. Currently I'm using 5e30. 

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