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Prime95

Prime95 29.8 Build 6

Latest
August 30th, 2019 - What's New
  • 6.7 MB
    Win 10, 8, 7 (64-bit)
    p95v298b6.win64.zip
    6AC260EF65D259A7CDE9C594353ABD7D
  • 5.4 MB
    Win 10, 8, 7 (32-bit)
    p95v298b6.win32.zip
    4F7D1CC7904D5D9CCB26C8C00B6470A9
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Publisher: GIMPS
Downloaded: 75,612 times (286.6 GB)
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Version History

29.8 Build 6 (August 30th, 2019)

  • Support added for AVX-512 FFTs.
  • FMA3 FFTs now have slightly higher FFT crossover points.
    Soft crossovers are no longer used by default. See undoc.txt.
  • Torture test dialog box options now based on cache sizes.
    Options for performing a weaker torture test are available.
    Torture tests that use all RAM are now more stressful.
    In-place vs. not in-place memory accesses now displayed on screen.
    On machines with more than 5GB of memory, blend defaults to all but 3GB of RAM.
  • Add & subtract operations for AVX-512 FFTs are now multithreaded.
    This should improve performance for P-1 and ECM when using multiple threads. 
  • Benchmark results are now written to results.bench.txt.
  • JSON results are now available for all work performed.
    JSON results are written to results.json.txt.
  • PRP tests with Gerbicz error checking are more immune to hardware errors.

29.8 Build 5 (July 1st, 2019)

  • Benchmark states results are written to results.txt. Changed message to say results.bench.txt
  • For PRP work, TF depth was not being written to worktodo.txt unless P-1 was required. This caused Test/Status to underestimate the chance that the PRP test would find a new Mersenne prime

29.8 Build 3 (May 6th, 2019)

  • Support added for AVX-512 FFTs.
  • FMA3 FFTs now have slightly higher FFT crossover points. Soft crossovers are no longer used by default. See undoc.txt.
  • Torture test dialog box options now based on cache sizes. Options for performing a weaker torture test are available. Torture tests that use all RAM are now more stressful. In-place vs. not in-place memory accesses now displayed on screen. On machines with more than 5GB of memory, blend defaults to all but 3GB of RAM.
  • Add & subtract operations for AVX-512 FFTs are now multithreaded. This should improve performance for P-1 and ECM when using multiple threads.
  • Benchmark results are now written to results.bench.txt. 
  • JSON results are now available for all work performed. JSON results are written to results.json.txt.
  • PRP tests with Gerbicz error checking are more immune to hardware errors.

29.4 Build 8 (February 21st, 2018)

1) GIMPS has a new sub-project -- finding (probable) prime Mersenne cofactors.

This sub-project has two parts: 1) Running PRP tests, and 2) Finding additional factors. To support this new sub-project there are three new work preferences: PRP on Mersenne cofactors, PRP double-checking on Mersenne cofactors, ECM on Mersenne cofactors.

2) Like LL tests, PRP tests now support shift counts to aid in running double-checks. Shift counts are only supported for Mersenne numbers and Mersenne cofactors.

3) PRP tests now support a type of low overhead error checking that almost guarantees correct results even on flaky hardware. We call this Gerbicz error-checking after it was proposed by Robert Gerbicz at mersenneforum.org. This error-check only works for base-2 numbers.

4) Because PRP tests are highly reliable, we now offer the option to do PRP tests instead of Lucas-Lehmer primality tests. There are 3 new work preferences similar to LL work preferences: first-time PRP tests, world record PRP tests, PRP tests on 100 million digit numbers, and PRP double-checking. If you are looking for a 100 million digit prime, PRP testing is recommended rather than LL testing.

5) For non-base-2 PRP tests, there is a new option to run each iteration twice and rollback if a mismatch occurs. Useful only on flaky hardware due to the obvious high overhead.

6) Minor performance tweaks were made to stage 1 of P-1. Save files are incompatible in stage 1. Wait for your P-1 test to reach stage 2 before upgrading.