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Thread: Prime95

  1. #1
    Xtreme Mentor stasio's Avatar
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    Prime95

    Prime95 v26.5

    ftp://mersenne.org/gimps/p95v265.zip
    ftp://mersenne.org/gimps/p64v265.zip

    1) Pentium 4s and Celerons with L2 cache size of 256K or less choose a length 4M FFT when they could use an FFT between 1600K and 4M in size. Fixed in next release.
    2) The on screen message reporting that errors have occurred during the LL test was wrong. The counts for "SUM(INPUTS) != SUM(OUTPUTS)" and "ROUNDOFF > 0.4" were reversed. Fixed in next release.
    3) Dual-boot users running a 32-bit and 64-bit executable on the same exponent may experience "Unable to initialize FFT" message. This happens when prime95 writes an FFT size to worktodo.txt and that FFT size is only supported by just one of the two executables. For example, the 2240K FFT length is supported for 64-bit Core 2 but not 32-bit Core 2. Fixed, somewhat inelegantly, in 26.5 -- unimplemented FFT lengths are ignored when worktodo.txt is read.
    4) Prime95 will sometimes inexplicably unreserve exponents. I think this happens when prime95 incorrectly calculates the CPU speed. Version 26.5 will only use a new slower CPU speed measurement after several slower CPU measurements. Hopefully, this will resolve the unreserve problem caused by a single erroneous CPU speed measurement.
    5) Prime95 would lose the how_far_factored and tests_saved information on PRP= lines in worktodo.txt. Fixed in 26.5.
    5) Prime95 did not offer an option to delete P-1 save files when a work unit completes. Fixed in 26.5.
    6) Prime95 did not fully understand Sandy Bridge CPUID output. Fixed in 26.5.
    7) Prime95 did not accurately report the CPU speed. Fixed in 26.5.
    8) At startup, the workers threads do not start up properly until communication with the server completes. If you have a large worktodo.txt file, this will result in wasted CPU time and many "use count" error messages. Fixed in 26.5.
    9) Time estimates for trial factoring to 2^79 and above were incorrect. Fixed in 26.5.
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  2. #2
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    Prime95 v26.5 Build 2

    ftp://mersenne.org/gimps/p95v265.zip
    ftp://mersenne.org/gimps/p64v265.zip

    1) Minor bug fixes.
    2) Starting in build 2, P-1 work will display the chance of finding a factor.
    The worktodo.txt line must include how_far_factored using the new syntax:
    Pminus1=k,b,n,c,B1,B2[,how_far_factored][,B2_start][,"factors"]
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  3. #3
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    Prime95 v26.5 Build 3

    ftp://mersenne.org/gimps/p95v265.zip
    ftp://mersenne.org/gimps/p64v265.zip

    Starting with build 3, at startup the program tries to determine which
    hyperthreaded logical CPUs comprise one physical CPU. If this isn't working
    properly, see the AffinityScramble2 setting in undoc.txt. The previous
    version's AffinityScramble setting is no longer supported!
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  4. #4
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    Need a Gigabyte latest BIOS?
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  5. #5
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    Prime95 v26.5 Build 5

    ftp://mersenne.org/gimps/p95v265.zip
    ftp://mersenne.org/gimps/p64v265.zip

    -Fixes the dual-core non-SSE2 benchmark crash
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  6. #6
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    My download always dies between 17 and 23% :/

  7. #7
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    Quote Originally Posted by nullface View Post
    My download always dies between 17 and 23% :/
    Fine here try again or use the links below I just uploaded them too.

    http://www.mediafire.com/file/du85lt...6p/p95v265.zip

    http://www.mediafire.com/file/fbxg58...bl/p64v265.zip


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  8. #8
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    Quote Originally Posted by C-N View Post
    Thanks man, I can't DL anything form ftp://mersenne.org it seems

  9. #9
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    Quote Originally Posted by nullface View Post
    Thanks man, I can't DL anything form ftp://mersenne.org it seems
    You're v welcome

    I hate getting stuck knowing where something I want is & not being able to get it.


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  10. #10
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    Prime95 v26.6 Build 1-x64 only

    ftp://mersenne.org/gimps/p64v266.zip

    -For rare cases where the program cannot figure out the number of cores and hyperthreading,
    the NumPhysicalCores option may help.
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  11. #11
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    Quote Originally Posted by stasio View Post
    Prime95 v26.6 Build 1-x64 only

    ftp://mersenne.org/gimps/p64v266.zip

    -For rare cases where the program cannot figure out the number of cores and hyperthreading,
    the NumPhysicalCores option may help.
    I have tried to download from this link for days now and it just seems to stop about half way through. Is anyone else having this problem or does anyone have another link?

  12. #12
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    Works perfectly for me. Try a different browser.
    Donate to XS forums
    Quote Originally Posted by jayhall0315 View Post
    If you are really extreme, you never let informed facts or the scientific method hold you back from your journey to the wrong answer.

  13. #13
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    Quote Originally Posted by Fire488 View Post
    I have tried to download from this link for days now and it just seems to stop about half way through. Is anyone else having this problem or does anyone have another link?
    http://www.mediafire.com/?ptwdc2vats6r722


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  14. #14
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    Last edited by stasio; 04-03-2011 at 12:56 AM.
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  15. #15
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    Prime95 v26.6 Build 3

    ftp://mersenne.org/gimps/p95v266.zip
    ftp://mersenne.org/gimps/p64v266.zip

    http://www.mediafire.com/?1m7y1kfv9vbj618

    1) Occasionally, P-1 stage 2 would report 100% complete before stage 2 completed. This bug has been around forever. I've finally found the cause! Fixed in 26.5 build 2.
    2) Worktodo.txt was not updated properly when P-1 completed for a PRP test. Fixed in 26.5 build 3.
    3) In 26.5 build 3, when benchmarking and measuring CPU speed the program will keep all cores busy by launching auxiliary threads that loop indefinitely. This should prevent Intel Turbo boost from kicking in. This should prevent cases where the CPU speed is reported as 1.87 GHz, yet a benchmark reports very fast timings because the CPU core has been boosted to 3.2 GHz because only one core is active.
    4) In 26.5 build 3, the OS's mapping of hyperthreaded logical CPU numbers to physical CPUs is determined automatically at startup. The AffinityScramble setting (see undoc.txt) is no longer supported. It is replaced by the AffinityScramble2 setting.
    5) In 26.5 build 3, the message "set affinity to run on any cpu" instead listed all the CPU numbers and as well as CPU #31. Fixed in build 4.
    6) In 26.5 build 3 and 4, benchmarking a dual-core non-SSE2 machine will crash. Fixed in build 5.
    7) KeepPminus1SaveFiles=0 option described in undoc.txt did not work when a factor was found. Fixed in 26.6.
    8) The 32K,64K,80K length FFTs with sumout checking for Pentium 4's with 256K or less cache were not implemented. Symptom is a torture test failure. Fixed in 26.6.
    9) Prime95 does not load on Sandy Bridge CPUs running Win XP. I've got a trial fix in 26.6.
    10) Prime95 chooses very inefficient FFT implementations for Core 2 Celerons (they have 512K L2 cache). Working on a fix for for 26.6.
    11) Logical CPU numbers were sometimes output zero-based and sometimes one-based. In 26.6, they are all one-based.
    Last edited by stasio; 04-08-2011 at 05:56 PM.
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  16. #16
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    Prime95 v27.1 Build 1

    ftp://mersenne.org/gimps/p95v271.zip

    From developer:
    A very early pre-beta prime95 version 27.1 is available. It has support for most, but not all AVX FFT lengths. I have not done any of the 64-bit optimizations.

    I've been using this version on my Sandy Bridge for the last few days without incident. You are free to do so too. I'm fairly confident it will produce valid results as it has passed some torture testing and QA runs. If you do not have a Sandy Bridge CPU (or maybe a Bulldozer) there is absolutely no reason to download this version. In fact it would be dangerous to do so as I have not tested the SSE2 or x87 FFTs to see if I've broken something!
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  17. #17
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    Prime95 v27.3 Build 1

    ftp://mersenne.org/gimps/p95v273.zip
    ftp://mersenne.org/gimps/p64v273.zip

    This version supports 64-bit optimized AVX FFTs. 32-bit AVX FFTs are also a little bit faster. I haven't done full benchmarks so I'm not sure how much faster it is than versions 27.2 or 26.6.

    The good/bad news is these FFTs are so fast that they are limited by memory bandwidth -- standard Sandy Bridge CPUs will experience a slow down when running all 4 cores. I'd like to hear from Sandy Bridge-E users to see if they also suffer slow downs when all 4 cores are running
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  18. #18
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    Prime95 v27.4 Build 1

    ftp://mersenne.org/gimps/p95v274.zip
    ftp://mersenne.org/gimps/p64v274.zip

    This version fixes a number of bugs in 27.3 - mostly related to LLR and PFGW issues. There are no speed improvements over 27.3. Hopefully, Bulldozer processors now properly run SSE2 FFTs.
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  19. #19
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    Prime95 v27.6 Build 1

    ftp://mersenne.org/gimps/p95v276.zip
    ftp://mersenne.org/gimps/p64v276.zip

    1) Multi-threaded tests might be a little bit faster especially when using a lot of threads.
    Of course, single-threaded usage still gives the best throughput.
    2) FFT crossover points were adjusted. Many higher, a few lower.
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  20. #20
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    Prime95 v27.6 Build 2

    ftp://mersenne.org/gimps/p95v276.zip
    ftp://mersenne.org/gimps/p64v276.zip

    1. A slower trial factoring algorithm is chosen sometimes. Fixed in version 27.6 build 2.
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  21. #21
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    Prime95 v27.6 Build 3

    ftp://mersenne.org/gimps/p95v276.zip
    ftp://mersenne.org/gimps/p64v276.zip

    The round off error can be incorrectly calculated. Fixed in 27.6 build 3.
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  22. #22
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    Prime95v.27.6 Build 4 (32/64-bit)

    ftp://mersenne.org/gimps/p95v276.zip
    ftp://mersenne.org/gimps/p64v276.zip

    - Mprime -v does not print out the build number. Fixed in version 27.6 build 4.
    - Torture test on small FFTs gets round off errors or crashes after a while. Fixed in version 27.6 build 4
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  23. #23
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    - Torture test on small FFTs gets round off errors or crashes after a while. Fixed in version 27.6 build 4

    Wow for those of us stability testing this really throws a wrench in things. Guess I have to try my failed overclock again with this build.

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  24. #24
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    Quote Originally Posted by dnottis View Post
    - Torture test on small FFTs gets round off errors or crashes after a while. Fixed in version 27.6 build 4

    Wow for those of us stability testing this really throws a wrench in things. Guess I have to try my failed overclock again with this build.
    Until this is fully sorted it is best to use LinX with Win7 SP1 and run it with the all available memory option for stability testing.

  25. #25
    Xtreme Mentor stasio's Avatar
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    Prime95v.27.7 Build 1 (32/64-bit)

    ftp://mersenne.org/gimps/p95v277.zip
    ftp://mersenne.org/gimps/p64v277.zip

    Torture test on small FFTs gets round off errors or crashes after a while. In very rare cases, regular tests could crash or raise a round off error. Fixed in version 27.7.
    Multithreaded FFTs could deadlock. Fixed in version 27.7.
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