Prime numbers have long fascinated amateur and professional mathematicians. An integer greater than one is called a prime number if its only divisors are one and itself. The first prime numbers are 2, 3, 5, 7, 11, etc. For example, the number 10 is not prime because it is divisible by 2 and 5. A Mersenne prime is a prime of the form 2P-1. The first Mersenne primes are 3, 7, 31, 127 (corresponding to P = 2, 3, 5, 7). There are only 44 known Mersenne primes.
GIMPS, the Great Internet Mersenne Prime Search, was formed in January 1996 to discover new world-record-size Mersenne primes. GIMPS harnesses the power of thousands of small computers like yours to search for these "needles in a haystack".
What is new in this release:
Version 29.4b7 may include unspecified updates, enhancements, or bug fixes.
What is new in version 29.4b5:
- GIMPS has a new sub-project -- finding (probable) prime Mersenne cofactors.
- Like LL tests, PRP tests now support shift counts to aid in running double-checks.
- PRP tests now support a type of low overhead error checking that almost guarantees correct results even on flaky hardware.
- Because PRP tests are highly reliable, we now offer the option to do PRP tests instead of Lucas-Lehmer primality tests.
- For non-base-2 PRP tests, there is a new option to run each iteration twice and rollback if a mismatch occurs.
What is new in version 29.3:
- Enhanced error checking for LL tests
- Faster step 1 GCD for ECM and P-1 factoring
What is new in version 28.10:
- Faster trial factoring for machines that support FMA (Haswell and later). Multi-threaded trial factoring now supports more than one thread sieving for small primes. Several tuning parameters added - see undoc.txt.
- The portable library, hwloc, for analyzing a machine's topology is now used. This replaces the buggy code prime95 used to detect hyperthreading. It also eliminates the need for AffinityScramble2. Running a benchmark will output this topology information to results.txt.
- AVX-512 trial factoring support added.
- Dialog box for benchmarking added.
- In the Test/Worker Windows dialog box you no longer choose how many threads each worker uses. Instead, you choose how many CPU cores each worker uses. There affinity options have been removed. There are two new options that will decide if each worker also uses hyperthreading.
What is new in version 27:
- This latest version of prime95 has been optimized for Intel's new AVX instruction set. Owners of Sandy Bridge and Ivy Bridge CPUs (Core i3/i5/i7 2xxx and 3xxx) will see a substantial performance boost..
Requirements:
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