mersenneforum.org

mersenneforum.org (https://www.mersenneforum.org/index.php)
-   Cunningham Tables (https://www.mersenneforum.org/forumdisplay.php?f=51)
-   -   Contributing to Cunningham Project (https://www.mersenneforum.org/showthread.php?t=24211)

frmky 2019-04-12 05:09

I don't have 2,1165+ reserved. The forum is welcome to do it as a team project. If you prefer, I'm happy to run the sieving on NFS@Home. Entirely up to y'all.

pinhodecarlos 2019-04-12 05:53

I did point my cores to NFS@home, there’s a mersenneforum.org team in there.

ET_ 2019-04-12 11:52

[QUOTE=VBCurtis;513465]I think 2,1165+ is GNFS at C217. This would make a nice size for a forum-team-sieve, if we can round up enough CADO users willing to pledge CPU cycles.
Rather than clutter this thread, anyone interested can start a new thread for 2,1165+ specifically and we can coordinate ECM / poly select / sieve pledges / etc.
(I didn't check whether Greg already has plans for this number, it may already be reserved to NFS@home)[/QUOTE]

I could be interested as well.

swellman 2019-04-12 12:15

I will help poly search for 2,1165+.

Max0526 2019-04-12 13:02

C217 2,1165+ poly select
 
Could we please drop an intro message on [URL]https://mersenneforum.org/showthread.php?t=18368&page=159[/URL] about this C217? And post msieve/CADO and ranges for everybody involved? Thank you!

VBCurtis 2019-04-12 16:37

It's not clear that 2,1165+ has been ECM'ed enough to jump into poly select.
That said, since frmky is willing to sieve it in case we don't have enough forum interest for a team sieve, we have every reason to poly select it once ECM is nearly-done.
I'm not personally up on how much ECM has been done on which Cunningham numbers; this project gets a lot of attention so I wouldn't be surprised if a t65 has already been done, but we should be sure of that before we spend cycles on poly select.

Using 0.31 * GNFS size = as a heuristic for ECM depth, we get 67.27 which is just over 2*t65. I wonder what the Bayesian tool suggests?

Mr Silverman kindly PMed me to point out that there are also 2,2210M C211, 2,2330L C207, and 2,2330M C210 as GNFS targets in the Cunningham project. I personally like 2,1165+ more than these for a forum project (for one, it ought to be degree 6 poly), but at C217 it's more than twice as hard. I'm willing to get behind whichever candidate gets best support from the forum.

Max0526 2019-04-12 17:32

next C200+
 
I would vote for 2,2330L C207. It is the smallest, it could potentially be degree 5 or degree 6 for the poly, and we already have a goal for the poly score from two years ago on 5- or 6-side: E = 1.6e-15.

swellman 2019-04-12 19:25

[QUOTE=Max0526;513524]I would vote for 2,2330L C207. It is the smallest, it could potentially be degree 5 or degree 6 for the poly, and we already have a goal for the poly score from two years ago on 5- or 6-side: E = 1.6e-15.[/QUOTE]

Ditto. It’s the smallest GNFS job left in the bunch though I would not call it easy.

Adding the four GNFS composites for ECM to t65. Chasing t65 beyond ~70K curves is not currently planned.

BTW, yoyo just found a [url=http://www.rechenkraft.net/yoyo//y_factors_ecm.php]p64 factor for 2,1087+[/url], which is now fully factored!

lukerichards 2019-04-12 19:33

[QUOTE=VBCurtis;513516]I personally like 2,1165+ more than these for a forum project (for one, it ought to be degree 6 poly).[/QUOTE]

Me too. :tu:

xilman 2019-04-12 19:44

[QUOTE=swellman;513542]BTW, yoyo just found a [url=http://www.rechenkraft.net/yoyo//y_factors_ecm.php]p64 factor for 2,1087+[/url], which is now fully factored![/QUOTE]Yay!

VBCurtis 2019-04-12 22:28

[QUOTE=Max0526;513524]I would vote for 2,2330L C207. It is the smallest, it could potentially be degree 5 or degree 6 for the poly, and we already have a goal for the poly score from two years ago on 5- or 6-side: E = 1.6e-15.[/QUOTE]

Pretty sure the transition from deg 5 to deg 6 lies between 215 and 220 digits. Our poly search for that C206 from XYYX had deg 5 and deg 6 scoring similarly, but the deg 5 performed something like 30% faster; another reminder of jasonp's admonition that scores from different degrees cannot be compared.

We can do C207 as a 34LP project on CADO, and I can host server tasks running I=16 for those with memory to spare and I=15 for those with lower-memory machines (say, 12GB and 3GB available for CADO client). I think I know how to merge the relations files from two runs into something CADO can handle; if not, msieve can likely put up with ~1.2G unique relations for postprocessing.

I'll set a core or two doing high-bound ECM on 2,2330L; I'll also PM user bdodson to see how much ECM he may have done on these numbers (thanks again to Mr Silverman for the suggestion).


All times are UTC. The time now is 07:40.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.