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Forum: 3*2^n-1 Search

2008-03-13, 17:00

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

I am ashamed to say there was a bug in the merge...

I am ashamed to say there was a bug in the merge routine for 321 sieve files. This does not mean there is a possibility of a prime being missed, but rather the opposite -- some factored numbers were...

Forum: 3*2^n-1 Search

2007-01-11, 08:13

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Initial tests show this is a great improvement --...

Initial tests show this is a great improvement -- on a pentium 4 the time dropped from 25 minutes to 17 minutes . We are running some more tests. It might be time to do more 321 sieving :lol:

Forum: 3*2^n-1 Search

2005-10-14, 16:49

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

I ran some tests: 753 kp/s Combined 1124...

I ran some tests:

753 kp/s Combined
1124 kp/s Odd
989 kp/s Even

If I spent a second doing the "odds" and another second doing the "evens" I would have raised the sieve by about 1000 kp....

Forum: 3*2^n-1 Search

2005-10-14, 15:10

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Are you saying that splitting the file in to odd...

Are you saying that splitting the file in to odd and even exponents and running them separately as two sieves is quicker than running just one combined sieve? How much quicker do you find running the...

Forum: 3*2^n-1 Search

2005-09-24, 20:23

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Thanks for your help Citrix. I tested...

Thanks for your help Citrix.

I tested "NewPGen" against "proth_sieve" on an Athlon 2000+ each over half an hour:

157991210844160 --> 157992664710736 (NewPGen)
157991210844160 -->...

Forum: 3*2^n-1 Search

2005-09-24, 19:25

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

I don't really want to start afresh. I would...

I don't really want to start afresh. I would rather convert the present 321-sieve file to Sob format and then test proth_sieve to see if is really quicker...

Forum: 3*2^n-1 Search

2005-09-24, 18:34

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

I found "proth_sieve" here...

I found "proth_sieve" here (http://81.233.34.19/proth_sieve.php) . I could not get it going because I don't have a program to convert between NewPGen format to SoB format.

I am interested in a...

Forum: 3*2^n-1 Search

2005-09-23, 21:27

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

You might find someone here to help you, but why...

You might find someone here to help you, but why don't you think about booking out a "321" LLR range instead?

We're nearly up to 175G==175T on the sieving front and will finish sieving completely...

Forum: 3*2^n-1 Search

2004-08-22, 13:44

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Okay. As soon as Paul releases a new newpgen.exe...

Okay. As soon as Paul releases a new newpgen.exe I will chop up what has to be sieved and distribute it to you.

At the moment I am sieving n=2-3m for 1<p<30 trillion. Thomas Ritschel is doing...

Forum: 3*2^n-1 Search

2004-08-22, 07:32

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Those Althons of yours would certainly speed up...

Those Althons of yours would certainly speed up the sieving.

I have written again to Paul Jobling reminding him to alter newpgen.exe so that it remembers to log removed candidate 321 numbers when...

Forum: 3*2^n-1 Search

2004-08-03, 22:09

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Okay. When Paul Jobling has modified NewPGen I...

Okay. When Paul Jobling has modified NewPGen I will contact you. Your range will have to be, I suppose, no more that 5 trillion... :smile:

Forum: 3*2^n-1 Search

2004-08-03, 18:38

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Probabaly not much help if it's part-time. How...

Probabaly not much help if it's part-time. How many hours per week is it on? Also the the Windoze version of NewPGen has to be modified to make it suitably automatic -- I am waiting for Paul Jobling...

Forum: 3*2^n-1 Search

2004-08-03, 11:33

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Well, I have started sieving n=2-3 million with...

Well, I have started sieving n=2-3 million with the view of doing any sieving for higher values when we are LLR'ing 2-3m. I have created 20 10trillion blocks which is more than plenty. After the...

Forum: 3*2^n-1 Search

2004-08-03, 11:17

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Your P4 is best suited to LLR work. I have...

Your P4 is best suited to LLR work.

I have decided to sieve only 2-3 million. Anybody wanting to help out please email me. You will probably have an Athlon/PIII and be prepared to run it for a few...

Forum: 3*2^n-1 Search

2004-08-03, 02:35

Replies: 53

Sieving

Views: 25,881

Posted By paulunderwood

Sieving

Okay we have the new LLRs from Jean and George and we will reach n=2 million all the sooner... but then what? I have started to sieve 2-7million not with aim of completely doing it but with that of...

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