20080721, 17:30  #1 
(loop (#_fork))
Feb 2006
Cambridge, England
14357_{8} Posts 
5^4211 sieving (reservations closed)
The .poly file is
Code:
n: 856747567165509732120757534754047466186338557004916269612235956443230634437193149247989845404816349224130750819510131856088353227722964229252203600736528648205287332264407802189199 skew: 1287906.31 c5: 5767280580 c4: 12525357190853198 c3: 23832471548163085528052 c2: 16917954271985164657592650551 c1: 14831413561315809659995278076458170 c0: 5682335232801110703624206006414844672400 Y1: 46531574816134967669 Y0: 10823715308709192191932199683059669 lpbr: 31 lpba: 32 mfbr: 62 mfba: 64 rlambda: 2.6 alambda: 2.6 rlim: 80000000 alim: 150000000 A millionQ range should take about ten CPUdays to sieve (using the 64bit ggnfs executable on a Core2/2400) and produce a bit over a million relations; we want about 400 million, so there's lots of reservation space. Use ggnfslasieve4I15e; the jobs take about ten minutes to get started, and use 900M of virtual and 400M of physical memory (450M under Windows). (12 Sep 2008)Please make reservations in the 40M80M region before carrying on from 328M (24 Sep 2008) Not taking any more reservations; this lot should suffice! Reservations Code:
bsquared 40M53M (done 30/09) batalov 53M55M (done 27/09) bsquared 55M75M (done 25/09) fivemack 75M90M (done 26/09) smh 90M100M fivemack 100M120M (done 14/09) smh 120M124M (done 07/09) fivemack 124M130M (done 02/09) smh 130M136M (done 31/08) andi47 136M140M smh 140M145M (done 07/08) frmky 145M150M (done 02/08) fivemack 150M162M (done 02/08) FactorEyes 162M170M (done 12/09) andi47 170.03M172.27M (done 01/09) fivemack 172.27M174M (done 13/09) Batalov 174M180M (done 19/09) bsquared 180M200M (done 31/07) bsquared 200M220M (done 08/08) fivemack 220M236M (done 18/08) bsquared 236M256M (done 18/08) fivemack 256M268M (done 30/08) bsquared 268M288M (done 27/08) bsquared 288M308M (done 10/09) bsquared 308M328M (done 19/09) bsquared 328M338M (done 24/09) fivemack 338M340M (done 29/09) Code:
40M92M 100M136M 140M340M Last fiddled with by fivemack on 20081001 at 10:52 Reason: Reservations Update 
20080721, 19:20  #2 
Tribal Bullet
Oct 2004
110111010001_{2} Posts 
With these parameters, your job will be the first test of msieve with 32bit large primes. The entire library is supposedly '32bit clean', but I expect postprocessing trouble commensurate with the epic size of this job. Did your 8G machine ever run the lanczos solver reliably?
Last fiddled with by jasonp on 20080721 at 19:21 
20080721, 21:36  #3 
(loop (#_fork))
Feb 2006
Cambridge, England
1100011101111_{2} Posts 
I managed to run a small job (29bit large primes) to completion with four threads on that 8G machine at one point, but I've had no luck getting the machine to misbehave on anything other than msieve, or reliably enough to be diagnosed when running msieve. So I'm contemplating getting another machine; I've got the money in the bank, but I'll wait until the sieving has finished in the hope that Nehalem exists by then.
[there's a 16GB 8core Penryn machine at work, but it's the fileserver, and running jobs that use most of it for months will not make me popular] 
20080722, 04:33  #4  
Oct 2004
Austria
2·17·73 Posts 
Nehalem
Quote:
Edit: For a longerterm test (a few days up to a few weeks) on your big machine you can possibly doublecheck M100,000,007 using prime95 version 25.6 (multithreaded). There are several interim residues posted in this thread, beginning at ~iteration #12M, and further every few million iterations. Last fiddled with by Andi47 on 20080722 at 04:45 

20080722, 09:38  #5 
Oct 2004
Austria
2·17·73 Posts 

20080723, 00:00  #6 
Oct 2006
vomit_frame_pointer
2^{3}×3^{2}×5 Posts 
How long for the seiving on this one?
If we assume that 11 volunteer sievers step up with an average of 36 million Q values apiece, that's 1 coreyear (=360 coredays) per volunteer, to get the sieving done. I'm assuming all have the 64bit optimized 4I5e running, which is optimistic. At 4 cores per volunteer, that's 3 months' running time.
Obviously there are the odd free cycles from clusters, which will likely do 1/3 of the work, so we're down to, say, 2 solid months from each volunteer with 4 cores available. Over the next 45 days I can easily finish my commitment of 8 million Q values, and I'll toss in more if they're needed, but I doubt I could sieve more than 20 million Q in six months. Give me a year, and I could toss in at least 30 million. It seems as if 45 months of sieving is the bare minimum here, unless there is substantial enthusiasm for this project. I think it's worth doing, especially since the linear algebra will push things a bit. I'm trying to get an idea of how to prioritize my current stack of fun integers. Do my ideas about the timeline sound about right? 
20080723, 07:38  #7  
(loop (#_fork))
Feb 2006
Cambridge, England
13×491 Posts 
Quote:
Quote:


20080723, 10:10  #8  
Oct 2004
Austria
2·17·73 Posts 
Quote:
Shortly before I leave for vacation I will reserve a second range (for the second thread of the core2duo). I can't start this right now, because it would take ~9092% of the available memory and thus will make it nearly impossible to work at this computer. 

20080723, 19:41  #9 
"Ben"
Feb 2007
3,433 Posts 
To be fair, I personally have very small compute resources; one lowly Athlon 4200+ X2 to be precise. The compute resources I have *access* to are quite a bit more substantial. Which reminds me that I'd like to make sure Sam Wagstaff is informed of that fact so the various universities can be acknowledged in the cunningham book. Hopefully that's possible.
I'm also grateful to Tom for organizing efforts like these, otherwise said resouces would be woefully underutilized. I can manage to launch a few scripts to aid projects which have already been skillfully researched and organized but a 3 year old and a 5 month old tend to otherwise occupy any time not spent working or sleeping :) Looking forward to seeing this one through!  ben. 
20080726, 04:43  #10  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
9416_{10} Posts 
Quote:
The file will be about 150Mb in size, and after "bzip2 9", 72Mb. Please remind where we should upload them and what's the secret city this time. Serge 

20080726, 20:45  #11 
(loop (#_fork))
Feb 2006
Cambridge, England
18EF_{16} Posts 
Code:
ftp chiark.greenend.org.uk user: anonymous pass: your email address cd special/twomackrelations/malmo put 150M151M.bz2 
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