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Old 2016-02-27, 20:05   #5
swellman's Avatar
Jun 2012

41·79 Posts

Originally Posted by NorbSchneider View Post
How can I use this .job files in msieve, to do snfs sieving?
msieve -ns, what parameter?, file name and format for the polynomial?
I do use YAFU for most factoring tasks, as Dubslow mentions. It handles things like multithreading and sieving limits pretty cleanly. If you don't have YAFU, it's easy to download and setup. Refer to the documentation or the YAFU subforum if you need help.

If you decide to use YAFU, just remember to rename the .job file of interest to nfs.job and make sure it's in the same directory as the YAFU executable. The command syntax for sieving n on the rational side is

yafu "nfs(n)" -v -r -R -ns x,y
where x = rlim/2 and y = x + range of special_q to be sieved. The algebraic side would use the -a flag in lieu of -r.

I often run a small interval of spec_q of 2000, just to make sure everything is working as it should. Then run the command again with no -ns x,y flag and YAFU will run the job from the last spec_q until sieving is complete, then automatically go through the entire NFS process until factors are found.
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