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  1. Thread: New SoB client

    by prime95
    Replies
    1
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    355

    Um, 28.5 just came out. Great for Haswell CPUs.

    Um, 28.5 just came out. Great for Haswell CPUs.
  2. Replies
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    1,057

    That 0.4375 is just the kind of round off error I...

    That 0.4375 is just the kind of round off error I wouldn't worry about. BTW, what number are you testing.
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    Again look at the size of the roundoff errors. ...

    Again look at the size of the roundoff errors. 0.40625 and 0.4375 are OK, 0.4999 is really bad.

    I think a roundoff error of 0.40625 and 0.4375 may sometimes not be reproducible because there...
  4. Replies
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    1,057

    Can you post the numbers that are getting...

    Can you post the numbers that are getting roundoff errors? I'll look into whether the FFT size selection code needs a little fine tuning.
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    If you are getting small reproducible roundoff...

    If you are getting small reproducible roundoff error values like 0.40625 and 0.4375 then it is likely due to testing a value near the limits of what that FFT size can test. In other words, nothing...
  6. Thread: New Prime95

    by prime95
    Replies
    19
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    4,141

    This is probably normal. On a Pentium 4, some...

    This is probably normal. On a Pentium 4, some FFT lengths are actually faster using FFTs optimized for the Core 2. Prime95 knows this and selects the right one accordingly. Admittedly, the "Core2...
  7. Thread: New Prime95

    by prime95
    Replies
    19
    Views
    4,141

    Yes. A quick edit of worktodo.txt will fix the...

    Yes. A quick edit of worktodo.txt will fix the problem
  8. Thread: New Prime95

    by prime95
    Replies
    19
    Views
    4,141

    Your best configuration is likely to be 4 worker...

    Your best configuration is likely to be 4 worker threads with no multi-threading. Use Test/Worker-windows to change turn off the multi-threading.

    Time it to see which is faster.
  9. Thread: New Prime95

    by prime95
    Replies
    19
    Views
    4,141

    New Prime95

    Prime95 version 26.2 is available for beta testing. See http://www.mersenneforum.org/showthread.php?t=13887

    It wouldn't hurt to have an SoB user or two give it a try.
  10. Has anyone else noticed this problem? I just...

    Has anyone else noticed this problem? I just tried replicating the problem and couldn't. Please check your results.txt files and let me know if this was a one time occurrence or if finding P-1...
  11. Thread: P-1 factorer

    by prime95
    Replies
    385
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    28,607

    If you have 128MB of physical memory, then you...

    If you have 128MB of physical memory, then you shouldn't tell the program to use more than 96MB or so (assumes OS and various programs need 32MB). If you tell the program to use too much memory, you...
  12. Thread: P-1 factorer

    by prime95
    Replies
    385
    Views
    28,607

    The optimal bounds picker changed too. I...

    The optimal bounds picker changed too.

    I remembered what the P4 optimal bounds bug was - the routine addr_offset in gwnum.c used uninitialized global variable FFTLEN rather than the local...
  13. Thread: P-1 factorer

    by prime95
    Replies
    385
    Views
    28,607

    Two observations: Sbfactorer does not seem to...

    Two observations:

    Sbfactorer does not seem to be based on the v23.4 gimps sources. Stage 2 was rewritten two months ago to use more memory if it can, use fewer multiplies, and to be more...
  14. Replies
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    Official verification is always done using...

    Official verification is always done using different hardware and software. In this case a 1 GHz MIPS machine using Ernst Mayer's Mlucas program
  15. Poll: GIMPS is currently testing exponents near...

    GIMPS is currently testing exponents near 20,000,000 - so you can be sure the new find is under 6 million digits.
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