20090906, 17:53  #298 
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
5722_{10} Posts 
is there any chance of a number of factors found counter + seconds per factor counter at some point?

20090906, 17:53  #299 
A Sunny Moo
Aug 2007
USA (GMT5)
3·2,083 Posts 
Indeed, that would be very useful in determining optimal depth. Once you have the removal rate and an estimated yield, it's a simple matter of plugging stuff into a formula to project the target depth.
Last fiddled with by mdettweiler on 20090906 at 17:56 
20090906, 18:50  #300 
Jan 2005
Caught in a sieve
2×197 Posts 
I've never been able to figure out the math for a factorspersecond counter. Even NewPGen isn't quite right, sometimes claiming it's slower when it finds two factors quickly in a row. Plus, that wouldn't tell you *unique* factors per second anyway, since the sieve file never gets updated.
axn, I noticed your 2GHz comment, so I rebenchmarked at 2GHz and got 17.5/14.25M for x64/SSE2 respectively. 
20090907, 03:54  #301  
Jun 2003
37×127 Posts 
Quote:
Holy crap, batman! That means we can take my earlier estimate of 300T and straight out multiply that by 10  so 3P. It also means that your original calculation of 5P is indeed in the right ball park  maybe more, if you factor in doublechecks. 

20090907, 04:31  #302 
Mar 2003
New Zealand
13·89 Posts 
The qmax=10e6 option in the default tpconfig.txt file should probably be removed/commented out, or at least made much larger, as the 10e6 value was intended for singlen sieving and will slow down the current project once p > 100e12.

20090907, 04:37  #303  
Jun 2003
37·127 Posts 
Quote:
* Manual sievers take the sieve blocks to ~100T. * Then feed into BOINC sieve, 1000n at a time. * As each block reaches optimal depth, they get put into LLR (manual/BIONC/whatever). Once one group is done with their "work unit", they move on to the next batch. The project doesn't have to end at any particular N  this thing scales very well. Last fiddled with by axn on 20090907 at 04:40 

20100529, 08:12  #304  
May 2010
499 Posts 
I've spent the past half hour or so browsing through this thread, and two things come to mind.
First, the sieve files for n=500000 seem to have vanished into thin air, as nothing ever gets uploaded. From what I've seen, at least three people had the files at some time: pacionet, cipher, and MooooMoo. Lets start from the beginning. At first, pacionet started sieving 050G. From: http://www.mersenneforum.org/showpos...5&postcount=90 Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:


20100529, 08:33  #305  
May 2010
499 Posts 
Quote:
http://tech.groups.yahoo.com/group/p...m/message/8342 http://tech.groups.yahoo.com/group/p...m/message/8344 Lets look at the first message by Mr. Underbakke: Quote:
Quote:
Here's the message from Mr. Broadhurst: Quote:
Thanks in advance for your help. 

20100530, 07:42  #306 
May 2010
499 Posts 
Well, it seems that part of the file has been found. Here's an email I've just received:
Dear Oddball, I happened to have come across your post this morning, and I would like to tell you that the file was not completely lost. MooooMoo was a real life friend of mine, and he sent me this file for safekeeping, which I have zipped and uploaded. The bad news, as you'll soon discover, is that only the first part of the range is available; the rest was either sent to someone else or is on an old computer I no longer own. I hope this is of some use to you, and even if it isn't, I am happy to have done my part to help close an unsolved chapter in the project's history. Warm regards, (name withheld) So now we finally have the uploaded link: http://www.sendspace.com/file/9t4rmo n=500,000 range= 50100G sieving depth= 135.9 T candidates= 19,651,092 Avg K per 1M = 393 Odds that a random candidate in the file will yield a twin: 1 in 36 million Odds that a random candidate in the file will yield a prime: 1 in 6000 Estimated number of (single) primes in the file: 3300 Probability that one of the candidates in the file will yield a twin: 42% 
20100530, 10:08  #307 
May 2010
499 Posts 
And here's another part:
http://www.sendspace.com/file/8l2wci I was emailed literally a few minutes ago by someone else (not the person who sent me the 50G100G file) who left me a message: Got this a few winters ago. You might want it. Enjoy. n=500,000 range= 100G208G sieving depth= 78.36 T candidates= 43,914,579 Avg K per 1M = 407 I suppose this provides some closure to the mystery files. If you have some cores to spare, I'd prefer that you work on the variable n range project instead of LLRing the n=500000 candidates or sieving either of these files further. Right now, the focus is on getting the variable n range to the optimal sieve depth, and we could use all the help we can get 
20100930, 15:33  #308 
Jan 2005
Caught in a sieve
110001010_{2} Posts 
FYI, I have a new version of TPSieve out, based on and in the same archive with the newer PPSieve, v0.3.10 (source)
Despite being newer, this version is unfortunately a little slower in many cases. But it's likely to be faster for people with AMD processors. If anyone finds it more than 10% slower than the old version on their machine, let me know. I plan to work on speedups later. By the way, if you're looking for the SSE2 version, it's rolled into the regular 32bit version and used automatically. Last fiddled with by Ken_g6 on 20100930 at 15:33 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
S9 and general sieving discussion  Lennart  Conjectures 'R Us  31  20140914 15:14 
Sieving discussion thread  philmoore  Five or Bust  The Dual Sierpinski Problem  66  20100210 14:34 
Combined sieving discussion  ltd  Prime Sierpinski Project  76  20080725 11:44 
Sieving Discussion  ltd  Prime Sierpinski Project  26  20051101 07:45 
Sieving Discussion  R.D. Silverman  Factoring  7  20050930 12:57 