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Old 2014-09-21, 16:17   #1
jasonp
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Default M991 discussion

Nobody seems to have come forward to coordinate the factorization of M991, and a few forum members see value in completing the job, so I'll put this here as a placeholder.

Here is a thread for the last time this came up. Finishing 2,991- will complete the base 2- Cunningham tables to 1000 bits. It's a big job, but Tom has done slightly smaller jobs singlehanded so it's well within our combined capabilities.

I have reserved 2,991- with Sam, attributed to 'mersenneforum'.

Just to make things clear, I personally only have the time to keep this thread current. The tasks I can think of are as follows, volunteers should just step forward and reply in this thread.

- come up with a GGNFS input file. This will need 2 algebraic and 3 rational large primes and a really hefty factor base.

Bob needs to be in charge of his own siever. If it can't handle a job this big, and he can't compile the GGNFS siever, and he can't run outside binaries, then either he has to be responsible for changing one of those three or he can handle all the small special-q.

- list out the special-Q ranges up for reservation. I can handle that; since the reservations will have to be manual, I'd recommend biting off a week of work at a time.

- find a place to host the relations. If Tom still has ftp space this would be the best option. Otherwise Carlos has offered his cloud storage, and in the worst case I've been meaning to buy a hard drive from this decade so I can do it. We will need on the order of 150GB or so.

- find someone to convert Bob's relations to GGNFS format. Serge previously volunteered to do this. Bob will probably have to snailmail a CD or something.

- do the postprocessing. I have really nice high-memory machines at work but Tom is best qualified to get this one done, using MPI on his monster box.

Okay, over to you...
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Old 2014-09-21, 16:49   #2
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I wouldn't feel comfortable doing the coordinating, but I can throw 18 threads worth of computer at this to generate relations.
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Old 2014-09-21, 17:52   #3
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Quote:
Originally Posted by jasonp View Post
- find someone to convert Bob's relations to GGNFS format. Serge previously volunteered to do this. Bob will probably have to snailmail a CD or something.
I will do that.
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Old 2014-09-21, 18:31   #4
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I don't seem to have ftp space at the moment. Also at present all my sieving CPUs are involved in factoring Fib(1373) ... of course the offer to do the linear algebra stands.

I'll tell you if either of those changes.

Last fiddled with by fivemack on 2014-09-21 at 19:48
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Old 2014-09-21, 18:39   #5
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I'm unsure of the boundaries of ECM vs. NFS, would it be worth taking it to T60/65 etc. or would that be a waste of time?
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Old 2014-09-21, 18:40   #6
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Quote:
Originally Posted by jasonp View Post
- find a place to host the relations. If Tom still has ftp space this would be the best option. Otherwise Carlos has offered his cloud storage, and in the worst case I've been meaning to buy a hard drive from this decade so I can do it. We will need on the order of 150GB or so.
I can't realistically do the post-processing but I can offer some sieving and any relation format conversion (I've received CDs/DVDs from Bob on a number of occasions). Since my connectivity upgrade I can also offer relation storage, as I've terabytes of free space. If Tom can do the post-processing then sneaker-net is the obvious way for me to get the relations to him as we live only a few miles apart and I've a spare 1TB USB disk or two.


Paul
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Old 2014-09-21, 19:51   #7
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Quote:
Originally Posted by legendarymudkip View Post
I'm unsure of the boundaries of ECM vs. NFS, would it be worth taking it to T60/65 etc. or would that be a waste of time?
http://mersenneforum.org/showpost.ph...3&postcount=16 : Thorsten Kleinjung has run 56k curves with B1=10^9 on 2^991-1, which I think is at least enough.
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Old 2014-09-21, 20:49   #8
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Okay, all that's left is to point to the lasieve5 binaries we need, and work out the parameters for them. Sam has confirmed the reservation.
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Old 2014-09-21, 20:56   #9
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Is there a Windows 64-bit version of lasieve5? I have lasieve4 64-bit.
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Old 2014-09-21, 22:50   #10
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I have not yet acquired a windows binary with the 33-bit largeprime limit removed, nor lasieve5.

Should this be a 33 or 34 bit project? If 33, do we expect ~1G raw relations?

I am interested in contributing 1% or so of the relations, on the order of a desktop-month of CPU.
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Old 2014-09-22, 00:07   #11
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M1061 required lasieve5 because it required special-Q above 2^32. I just assumed M991 was not smaller by enough to merit the smaller siever.
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