Marin Mersenne2^P-1
2014-09-23 14:21:49 UTC
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Today's Numbers
Teams 743
Users 126,851
CPUs 984,754
TFLOP/s 200.132
GHz-Days100,066
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996
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Contents
  1. Upgrade Instructions for Existing Users
  2. Setup Instructions for New Users
  3. Software Source Code
  4. Other Available Freeware
  5. Questions and Problems

Free Mersenne Prime Search Software

Version 28 released!

This latest version of prime95 has been optimized for Intel's new AVX2 instruction set. Owners of Haswell CPUs (Core i3/i5/i7 4xxx) will see a significant performance increase.

Any modern personal computer with Windows, Mac OS X, Linux, or FreeBSD can participate. The How it Works page answers many questions you may have before downloading the software. You must also agree to the GIMPS free software license.

Unix and non-x86 users should check out Ernst Mayer's Mlucas page and the Glucas page for guidance as to which code is best for their platform.

Some software has been written for NVIDIA and AMD GPUs. Visit the Mersenne GPU Computing Forum for more information.

Upgrade Instructions for Existing Users

If you are upgrading from version 24, then get special instructions needed to first upgrade to the latest version.
  1. Download the appropriate program for your OS: Windows 64-bit, Windows 32-bit, Mac OS X Mavericks, Linux 64-bit, or one of the other ports listed below in the instructions for new users sections.

  2. Upgrade the software. Stop and exit your current version, then install the new version overwriting the previous version. You can upgrade even if you are in the middle of testing an exponent.

  3. Restart the program.

  4. Read whatsnew.txt.

Setup Instructions for New Users

Joining GIMPS is usually as simple as downloading and running the program, answering a few questions, and the program does the rest.

There are cash awards for discovering a new Mersenne prime!

  1. If you have not done so, create your UserID. It's optional, but required to check your account details, computer status and performance statistics and to assign computers to your user ID.

  2. Download the appropriate free program for your OS and proceed to Step 3: Windows 64-bit, Windows 32-bit, Mac OS X Mavericks, Linux 64-bit, or one of the other special versions listed below.
    More details about these programs, plus and a few more versions for other operating systems, are given here:

    Operating System Version Released Size Download Notes
    Windows 8/7/Vista/XP/2008 64-bit28.530 May 20145.1MBp95v285.win64.zip
    .torrent
    Windows 8/7/Vista/XP/2008/2003/2000/NT/Me/98/95 32-bit28.530 May 20144.1MBp95v285.win32.zip
    .torrent
    Linux 64-bit28.530 May 20145.4MBp95v285.linux64.tar.gz
    .torrent
    Linux 32-bit28.530 May 20144.4MBp95v285.linux32.tar.gz
    .torrent
    Mac OS X28.530 May 20143.4MBp95v285.MacOSX.zip
    .torrent
    Requires Mac OS X Mavericks (10.9)
    Mac OS X command line version28.530 May 20143.5MBp95v285.MacOSX.noGUI.tar.gz
    .torrent
    No GUI. Requires Mac OS X 10.7 or later and an Intel CPU.
    Mac OS X pre-Mavericks27.912 Dec 20125.1MBp95v279.MacOSX.zip
    .torrent
    Requires Mac OS X 10.3 to 10.8 and an Intel CPU.
    FreeBSD 64-bit28.530 May 20145.3MBp95v285.FreeBSD10-64.tar.gz
    .torrent
    Requires FreeBSD 10.0
    FreeBSD 64-bit27.912 Dec 20124.5MBp95v279.FreeBSD64.tar.gz
    .torrent
    Requires FreeBSD 8.0. May work on later versions.
    FreeBSD 32-bit26.68 Apr 20114.0MBmprime266-FreeBSD.tar.gz
    .torrent
    Requires FreeBSD 7.0. May work on later versions.
    Windows 8/7/Vista/XP/2008 64-bit Service28.530 May 20145.0MBp95v285.win64.service.zip
    .torrent
    This is for administrators that want the extra security of running a traditional GUI-less service. You will still need to download the standard windows executable to configure the client. This program is for Windows Server experts only.
    Windows 8/7/Vista/XP/2008/2003/2000/NT 32-bit Service28.530 May 20144.0MBp95v285.win32.service.zip
    .torrent
    This is for administrators that want the extra security of running a traditional GUI-less service. You will still need to download the standard windows executable to configure the client. This program is for Windows Server experts only.
    Source code for Windows, Linux, FreeBSD, and Mac OS X28.530 May 201442.7MBp95v285.source.zip
    .torrent
  3. Create a directory and decompress the file you just downloaded. Windows 8, 7, Vista, and XP have built-in unzip features. Other Windows users can choose from a variety of decompression programs. We use 7-zip. Linux and FreeBSD users should use the standard tar and gzip decompression utilities.

  4. Configure Primenet Start the program!
    Linux and FreeBSD users should run the program from the command line with a -m switch, i.e. ./mprime -m

    Enter your optional userID created on the website in Step 1, and optionally name your computer. We recommend Windows users select Options » Start at Bootup or Start at Logon.

    That's all you need to do! The program contacts a central server called PrimeNet to get some work to do. Usually the program and PrimeNet know the best work to assign, but it's up to you! You can administer your account and computers on your userID's account page. Once you complete a workunit you can track your standings on the competitive stats pages the server updates every hour (see Top Producers in the menu, left, for more stats). You can monitor each of your computers' progress, even remote-control the work assignments they request using your userID's CPUs page!
    Linux and FreeBSD versions can also be set up to run every time you restart your computer.
    Ask for help at the Mersenne Forum.

Questions and Problems

Please consult the readme.txt file for possible answers. You can also search for an answer, or ask for help in the GIMPS forums. Otherwise, you will need to address your question to one of the two people who wrote the program. Networking and server problems should be sent to Scott Kurowski. Such problems include errors contacting the server, problems with assignments or userids, and errors on the server's statistics page. All other problems and questions should be sent to George Woltman, but please consult the forums first.

Disclaimers

See GIMPS Terms and Conditions. However, please do send bug reports and suggestions for improvements.

Software Source Code

If you use GIMPS source code to find Mersenne primes, you must agree to adhere to the GIMPS free software license agreement. Other than that restriction, you may use this code as you see fit.

The source code for the program is highly optimized Intel assembly language. There are many more-readable FFT algorithms available on the web and in textbooks. The program is also completely non-portable. If you are curious anyway, you can download all the source code (42.7MB). This file includes all the version 28.5 source code for Windows, Linux, FreeBSD, and Mac OS X. Last updated: 30 May 2014.

The GIMPS program is very loosely based on C code written by Richard Crandall. Luke Welsh has started a web page that points to Richard Crandall's program and other available source code that you can use to help search for Mersenne primes.

Other available freeware

At this time, Ernst Mayer's Mlucas program and Guillermo Ballester Valor's Glucas programs are the best choices for non-Intel architectures. Luke Welsh has a web page that points to available source code of mostly historical interest you can use to help search for Mersenne primes.

Last updated: 16 Sep, 2014
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