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Thread: P-1 coordination thread - discussion

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  1. #1
    I switched over from prime v25.6 to v25.7.
    Since I switched over I see an extra text at the result.txt.
    With 25.6 I had results like:

    [Fri Oct 10 20:25:04 2008]
    21181*2^15854852+1 completed P-1, B1=130000, B2=2200000, Wd1: 9A15E8A8

    And now with 25.7 I mostly get results like:

    [Tue Oct 14 22:45:12 2008]
    55459*2^16041334+1 completed P-1, B1=130000, B2=2200000, E=6, Wd1: 9F09E1E8

    What does E=6 mean?

  2. #2
    Quote Originally Posted by Joh14vers6 View Post
    I switched over from prime v25.6 to v25.7.
    Since I switched over I see an extra text at the result.txt.
    With 25.6 I had results like:

    [Fri Oct 10 20:25:04 2008]
    21181*2^15854852+1 completed P-1, B1=130000, B2=2200000, Wd1: 9A15E8A8

    And now with 25.7 I mostly get results like:

    [Tue Oct 14 22:45:12 2008]
    55459*2^16041334+1 completed P-1, B1=130000, B2=2200000, E=6, Wd1: 9F09E1E8

    What does E=6 mean?
    I'm getting the same thing on my 32 bit client, but not on the 64 bit client.

    Edit: I now see that this has been answered on mersenneforum: http://www.mersenneforum.org/showthread.php?t=10902

  3. #3

    Found an already found factor

    Today I found the factor:
    P-1 found a factor in stage #2, B1=130000, B2=2200000.
    21181*2^16496492+1 has a factor: 13825033371936547

    But I will not get any credit for it because user 13796 (PrimeGrid) already found this factor.
    I found that out here: http://www.seventeenorbust.com/sieve/results.txt.bz2
    I searched for more tests with already found factors in my worktodo.txt and found another two already found factors by PrimeGrid. So I deleted them from the worktodo.txt.

    How can I prevent PrimeGrid finding my factors first?

  4. #4
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    It is always annoying when not getting credit for a factor found. There is of course no way to prevent sieving finding factors in your factoring range. It is only possible check for found factors before starting factoring. The factor you post is 13.8P which is in a sieve range PrimeGrid did a some time ago and when I look in the "worktodo_16000000_16500000.zip" posted in the "P1 coordination thread", the test you post have been excluded. You should use an updated worktodo file.

  5. #5
    Moderator Joe O's Avatar
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    Quote Originally Posted by Joh14vers6 View Post
    How can I prevent PrimeGrid finding my factors first?
    By checking your worktodo.txt against results.txt on a daily basis and removing k n pairs from your worktodo.txt that have already been factored and posted in results.txt.

    Edit:
    Quote Originally Posted by shauge View Post
    You should use an updated worktodo file.
    Thanks shauge. I wrote my answer before seeing your post. I did not consider that Joh14vers6 would have used an obsolete worktoto file. Actually, even my advice to check it daily would not always work. You are correct in saying that there is no way to prevent this from happening.
    Last edited by Joe O; 03-28-2009 at 01:35 PM.
    Joe O

  6. #6
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    I can recommend the "make worktodo" site my team mate runesk made to get a worktodo file which eliminates the factors found in the current online results.txt.bz2 file and I will mention my own tool that checks a local worktodo.txt against a locally copied version of results.txt and displays already found factors (take care not to overwrite the prime95 output file "results.txt")

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