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2009-04-19, 13:28   #45
jasonp
Tribal Bullet

Oct 2004

3×1,181 Posts

Quote:
 Originally Posted by mdettweiler Hmm...I see. So, does that essentially negate any efficiency savings otherwise gained by doing that little bit of line sieving at low b-levels?
If previous experience is any guide, about half the relations you found by line sieving are also going to be found by lattice sieving. There are differences in the sievers that mean they won't find exactly the same relations, but also the line sieve will find relations whose large primes are above the limit of the special-q's that you test.

37k relations is not very many in the grand scheme of things; the line siever did find them much more quickly than the lattice siever would have needed. For polynomials with large amounts of skew, you really need to tell the line siever to use much larger lines (maybe with width 10x larger than the default). If you want, open the msieve.fb file and multiply the number next to SLINE by 10, then re-sieve a few lines and note the difference. It will take close to 10x longer though...

 2009-04-19, 16:51 #46 jrk     May 2008 3·5·73 Posts 6.6M to 7.2M done. 1373265 relations. Uploaded: 6.6M_to_7.2M (55.2 MB) Reserving 7.2M to 7.8M.
 2009-04-19, 17:18 #47 Andi47     Oct 2004 Austria 46628 Posts 50M to 54M done, 938271 relations. Reserving 1.7 to 1.8M
 2009-04-19, 17:52 #48 10metreh     Nov 2008 2·33·43 Posts This doesn't seem to be that much of a "team" sieve. (I'm concentrating on my own sequence.)
2009-04-19, 18:14   #49
mdettweiler
A Sunny Moo

Aug 2007
USA (GMT-5)

3×2,083 Posts

Quote:
 Originally Posted by Andi47 50M to 54M done, 938271 relations. Reserving 1.7 to 1.8M
Andi, I don't see your relations on the FTP server. Did you forget to upload them? (Or is the upload still in progress?)

Meanwhile:
* 6.0M- 6.6M jrk (done, 1388768 rels)
* 6.6M- 7.2M jrk (done, 1373265 rels)
Total relations received: 11307391 (56.5% of 20M rels)

 2009-04-19, 18:22 #50 henryzz Just call me Henry     "David" Sep 2007 Cambridge (GMT/BST) 3·1,979 Posts How much longer is this sieve going to take? I will reserve a 1M-2M range if it will last another week.
2009-04-19, 18:23   #51
schickel

"Frank <^>"
Dec 2004
CDP Janesville

2×1,061 Posts

Quote:
 Originally Posted by 10metreh This doesn't seem to be that much of a "team" sieve. (I'm concentrating on my own sequence.)
True, true, but next time I can provide some horsepower. I've got just one more NFS job for myself, so I'll have some spare cycles.

2009-04-19, 18:24   #52
mdettweiler
A Sunny Moo

Aug 2007
USA (GMT-5)

3·2,083 Posts

Quote:
 Originally Posted by henryzz How much longer is this sieve going to take? I will reserve a 1M-2M range if it will last another week.
I'm not sure how much longer it will take; probably another 3 or 4 days at the rate we're going.

jrk, I presume you're using just one machine (possibly with multiple cores?) to run your ranges? If so, then I imagine a 1M range wouldn't take too long for henryzz to crunch on a similar amount of firepower.

2009-04-19, 18:34   #53
henryzz
Just call me Henry

"David"
Sep 2007
Cambridge (GMT/BST)

3·1,979 Posts

Quote:
 Originally Posted by mdettweiler I'm not sure how much longer it will take; probably another 3 or 4 days at the rate we're going. jrk, I presume you're using just one machine (possibly with multiple cores?) to run your ranges? If so, then I imagine a 1M range wouldn't take too long for henryzz to crunch on a similar amount of firepower.
I can definitely do a 1M range in that time on 2 cores.
Where is the thread for the c132? I could judge my timing from that.
reserving 7.8M-8.8M

2009-04-19, 19:02   #54
Andi47

Oct 2004
Austria

9B216 Posts

Quote:
 Originally Posted by Andi47 50M to 54M done, 938271 relations.
Quote:
 Originally Posted by mdettweiler Andi, I don't see your relations on the FTP server. Did you forget to upload them? (Or is the upload still in progress?)

Last fiddled with by Andi47 on 2009-04-19 at 19:03

 2009-04-19, 19:12 #55 jrk     May 2008 3×5×73 Posts I'm using one core. So henryzz should be able to do his range in a few hours on two cores.

 Similar Threads Thread Thread Starter Forum Replies Last Post jrk Aliquot Sequences 38 2011-05-16 17:58 schickel Aliquot Sequences 26 2011-02-24 23:19 schickel Aliquot Sequences 64 2011-02-19 02:28 jrk Aliquot Sequences 31 2010-12-30 21:33 10metreh Aliquot Sequences 77 2009-05-27 20:39

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