mersenneforum.org n=390000 discussions and old reservations
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 2010-05-03, 22:34 #1 Mini-Geek Account Deleted     "Tim Sorbera" Aug 2006 San Antonio, TX USA 2×5×7×61 Posts n=390000 discussions and old reservations Not sure if interest in this will continue, but I'll help a bit. Reserving k=500k-1M. This is a rather small and easy chunk of work. One core of my i5, taking 0.640 ms per iteration, (or 4 minutes and 9.6 seconds per candidate) should finish all 262 candidates in about 18 hours and 10 minutes. A multiple-million reservation would be a more typically-sized piece of work for most people. Last fiddled with by Oddball on 2010-05-24 at 00:07 Reason: changing title
2010-05-04, 18:41   #2
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

2×5×7×61 Posts

This file is too undersieved to do primality testing already. With NewPGen (I'm running an i5 on 32-bit XP; tpsieve with one thread is around half the speed) I can eliminate about one k every 2 seconds compared to one LLR test every 250 seconds. Unless I'm mistaken, (or shouldn't be ignoring things like accounting for double checks) that means that the sieve depth needs roughly 7 doublings (2 with 7 doublings is 2*2^7=256, just about 250) before it's optimally sieved for 32-bit (if you can get 64-bit sievers, sieve speed might approximately double, which might mean about another doubling). That puts it at roughly 400-450T (3.33*2^7=426.24) before primality tests ought to be run on this range.

I'm not putting a serious effort to sieving this at the moment, but I sieved it to 3.38T (107 factors in 267 seconds) with NewPGen. The new file is attached. (you might need to rename it to remove the ".zip" before it'll open, as the forum doesn't like .7z but only .7z will compress to under the attachment limit)
Attached Files
 390-3.38T.7z.zip (191.7 KB, 197 views)

Last fiddled with by Mini-Geek on 2010-05-04 at 19:04

 2010-05-05, 04:57 #3 Oddball     May 2010 499 Posts Hmmm, it looks like I can't edit the first post. Maybe that's because I'm not a mod. But anyway, I'm reserving 1M-1.2M. So far, we have: Code: Range Reserved by Status Primes found 0.0M-0.3M Oddball complete 0 0.3M-0.5M Oddball complete 0 0.5M-1.0M Mini-Geek complete 0 1.0M-1.2M Oddball in progress ? I'm planning to sieve more, so that range might not get done for some time. Last fiddled with by Oddball on 2010-05-05 at 05:11 Reason: typo
 2010-05-06, 17:45 #4 gribozavr     Mar 2005 Internet; Ukraine, Kiev 11×37 Posts My Core i5 can help sieving with all 4 cores (running 64-bit Linux of course). I just want to ensure that neither my nor anyone else's CPU hours would be wasted.
2010-05-06, 20:51   #5
Oddball

May 2010

1111100112 Posts

Quote:
 Originally Posted by gribozavr My Core i5 can help sieving with all 4 cores (running 64-bit Linux of course). I just want to ensure that neither my nor anyone else's CPU hours would be wasted.
Thanks for offering to help out!

Right now, just sieve 10G-150G to 8.1T. When you're done, merge that file into the 1M-10G file (which is also sieved to 8.1T) uploaded here:

http://www.sendspace.com/file/dfee42

You can then sieve the whole 1M-150G file at once from that point on. I couldn't do that because my PC didn't have enough RAM, but the RAM that usually comes with a core i5 should be enough to do the job.

I'll keep the old system for the credits the same. If/when a twin is found, the finder shares the credit with both the top siever and the top LLR tester.

2010-05-06, 20:55   #6
Oddball

May 2010

1F316 Posts

Those of you who want to jump right into LLR testing can start by downloading the attached file. It contains k=1M-10M, sieved to 8.1T. There are about 470 candidates per 1M.
Attached Files
 twin.txt (67.0 KB, 202 views)

2010-05-07, 10:29   #7
gribozavr

Mar 2005
Internet; Ukraine, Kiev

11×37 Posts

Quote:
 Originally Posted by Oddball Right now, just sieve 10G-150G to 8.1T.
Could you point me to the file? I don't seem to see it.

2010-05-07, 11:46   #8
Mini-Geek
Account Deleted

"Tim Sorbera"
Aug 2006
San Antonio, TX USA

2×5×7×61 Posts

Quote:
 Originally Posted by gribozavr Could you point me to the file? I don't seem to see it.
I don't think it exists yet, you'll have to start it from the beginning.
Apparently Oddball decided to change the scope of this. The only older files posted were for k=200k-200M, and now he's talking about 1M-10G and 10G-150G.

2010-05-07, 15:16   #9
Historian

Mar 2010

2B16 Posts

I haven't been on mersenneforum for quite some time, but I'll give this project a try. Reserving 1.2M-1.4M.

Quote:
 Originally Posted by Mini-Geek Apparently Oddball decided to change the scope of this. The only older files posted were for k=200k-200M, and now he's talking about 1M-10G and 10G-150G.
Another possibility could be that 1-10G was sieved, but he only chose to release 200k-200M because the whole 1-10G sieve file would take too long to download. As far as I can tell, he mentioned 1-150G all along, but he only sieved 1-10G because he lacked the resources to do so.

From: http://www.mersenneforum.org/showthread.php?t=13375

Quote:
 I'm proposing a new goal: test n=390,000 from k=1-150G.

2010-05-08, 09:01   #10
Oddball

May 2010

499 Posts

Quote:
 Originally Posted by Historian I haven't been on mersenneforum for quite some time, but I'll give this project a try. Reserving 1.2M-1.4M.
Welcome to TPS!

Quote:
 Another possibility could be that 1-10G was sieved, but he only chose to release 200k-200M because the whole 1-10G sieve file would take too long to download. As far as I can tell, he mentioned 1-150G all along, but he only sieved 1-10G because he lacked the resources to do so.
That is correct.

Anyway, I'm done with my old range (results attached). No primes were found, so I'm getting 1.4M-1.7M. Here's the current status:
Code:
Range		Reserved by		Status		Primes found
0.0M-0.3M	Oddball			complete	0
0.3M-0.5M	Oddball			complete	0
0.5M-1.0M	Mini-Geek		complete	0
1.0M-1.2M	Oddball			complete	0
1.2M-1.4M	Historian		complete	0
1.4M-1.7M	Oddball			in progress	?
1.7M+		available
Attached Files
 lresults.txt (9.3 KB, 195 views)

 2010-05-08, 09:13 #11 kar_bon     Mar 2006 Germany 24·3·61 Posts Looking at the First Twin k (see bottom, first graph) the estimated k-value for n=333333 using the formula k=0.2784*n^1.9652 is k=19871455920. The real values was k=65516468355. So for n=390000 it's estimated for k=27053869866 or about 27G.

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