20091205, 01:27  #1 
May 2008
Wilmington, DE
101100100100_{2} Posts 
Sieving drive for k=301400 n=1M2M
This is a sieving drive for k=301400 and n=1M2M. With testing complete to n=1M, this has become high priority so we would be grateful for any help that people can give.
Sr2sieve is what we will use for sieving. The easiest way to start the program is to specify the ranges and file name at the command prompt as in: sr2sieve p 4000e9 P 4250e9 i sieve3004001M2M.txt The above would be if you were sieving P=4000G4250G. When complete, you should have a factors.txt file. Please Email the file to us at: gbarnes017 at gmail dot com For new searchers, please post a reservation and we will Email you the latest sieve file. All factors have been removed up to P=108T. We will continue removing factors for contiguous Pranges as we progress. Reservations: Code:
Prange reserved by status est. completion date 0G 3000G MyDogBuster complete 3000G 5000G Flatlander complete 5000G 7000G MyDogBuster complete 7000G 8000G Flatlander complete 8000G10000G Lennart complete 10000G14000G MyDogBuster complete 14000G15000G Flatlander conplete 15000G16000G MyDogBuster complete 16000G17000G Flatlander complete 17000G18000G Lennart complete 18000G22000G MyDogBuster complete 22000G23000G Lennart complete 23000G38000G MyDogBuster complete 38000G40000G Flatlander complete 40000G55000G MyDogBuster complete 55000G57000G Flatlander complete 57000G93000G MyDogBuster complete 93T104T gd_barnes complete 104T113T vaughan complete 113T140T gd_barnes complete Ian Last fiddled with by gd_barnes on 20100321 at 01:14 Reason: status update 
20091215, 18:58  #2 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Sieve for k=301400 n=1M2M
Since the "new" forum at http://www.noprimeleftbehind.net/forum/ will soon be going the way of the dinosaur, I'm copying the main thread of general importance from there, the k=300400 n=1M2M sieve, over here. I'll set up the first post to have Ian's name on it shortly and load it up with the appropriate data.

20091215, 19:06  #3 
A Sunny Moo
Aug 2007
USA (GMT5)
3×2,083 Posts 
Okay, that's all set now. The only thing left, of course, is to copy over all the other posts from the original thread, which would be way too much hassle to do onebyone with the original poster's name on it as with Ian's initial post here. Instead, I've condensed the original thread into two files:
A PDF file of the original thread in printable form: http://www.noprimeleftbehind.net/dow...400sieve.pdf An archive containing all the factor files attached to posts in the original thread: http://www.noprimeleftbehind.net/dow...actors.tar.bz2 All further discussion related to this sieve should take place in this thread, and not the original one. 
20091215, 21:47  #4 
May 2007
Kansas; USA
10200_{10} Posts 
Ian,
Since you started this effort, these are totally your choice but I'll throw out a couple of suggestions: 1. You might consider changing the 1st post to trillions vs. billions. It might be a little clearer. 2. If you can Email the latest sieve file to Max, he could put a link to it in the 1st post here. That'd make it easier for people to get started on it. (including me, lol) Max, if Ian sends you a file, would you mind loading it to the noprimeleftbehind web pages and putting a link to it in the 1st post here? Ian, I hadn't checked the status of this effort in a couple of months. Wow, you've really made some serious effort in the sieving. Thanks! Sometime after I get back, someone remind to compute an optimum sieve depth. My initial thought is that we will break off the sieving and testing efforts in n=1M1.3M, 13M1.6M, and 1.6M2M pieces. Even breaking off the pieces, I'm sure the initial optimum will be P>=100T for n=1M1.3M. If anyone has another suggestion on breaking it up, let us know. Gary Last fiddled with by gd_barnes on 20091215 at 21:48 
20091215, 23:53  #5 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 

20091216, 04:15  #6  
May 2008
Wilmington, DE
5444_{8} Posts 
Quote:
I'll get the file ready (I need too remove the latest factors) and send it to Max sometime tomorrow. I am a little sieved out so I'll be stopping after my current set up to 93T, oops 93000G. Edited: Sent the file to Max with factors removed up to 85000G. Last fiddled with by MyDogBuster on 20091216 at 04:34 

20091216, 04:44  #7 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 

20100106, 00:54  #8 
May 2008
Wilmington, DE
2^{2}×23×31 Posts 
85T93T complete
Who gets the factors to remove them from the main file? I'm all sieved out for the moment. Last fiddled with by MyDogBuster on 20100106 at 00:56 
20100106, 02:03  #9  
May 2007
Kansas; USA
2^{3}·3·5^{2}·17 Posts 
Quote:
You can Email them to me. In the next few days, I'll put a couple of quads here. I've been pouring my machines on David's (Ironbits) port 2000 to dry it out and after that port 8000 to dry it out in advance of getting all servers on my machine. A friend will be coming over sometime this week to build two more machines that I already have parts for, one of which will be the new server machine. With those built, I'll be able to throw them or a couple of my older machines on sieving here and maintain my load on David's servers. Question: How long does it take a quad to do a P=1T range? I'm thinking I'll reserve P=93T100T for two quads and I'm wondering how long that would take. Gary Last fiddled with by gd_barnes on 20100106 at 02:05 

20100106, 05:29  #10 
May 2008
Wilmington, DE
2^{2}×23×31 Posts 
It take a core about 12 days to do 1T.

20100114, 11:15  #11 
May 2007
Kansas; USA
10200_{10} Posts 
I think it probably makes the most sense to break this sieving effort up into 3 nranges: n=1M1.3M, 1.3M1.6M, and 1.6M2M while continuing to sieve the higher nranges at each level. I just did an optimal sieve depth calculation for breaking off n=1M1.3M:
On a 64bit 2.4 Ghz Intel: Test time of an n=1.21M candidate: 1984 secs. Removal rate at P=93T: 1526 secs. Optimum sieve depth: 1984 / 1526 * 93T = ~121T So, we'll make it a nice round P=120T, which means we have just P=27T to go. Anyone have any sieving machines available? If you don't have the file with all factors removed up to P=93T, let me know and I'll Email it to you. In the mean time, reserving P=93T100T. Gary Last fiddled with by gd_barnes on 20100114 at 13:10 
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