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Contents. Version 29.4 build 7 - See the latest file for a full list of changes. Highlights of version 29.4 include. 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.
Highlights of version 29.3 include. Enhanced error checking for LL tests. Faster step 1 GCD for ECM and P-1 factoring Any modern personal computer with Windows, Mac OS X, Linux, or FreeBSD can participate.
The page answers many questions you may have before downloading the software. You must also agree to the GIMPS. Unix and non-x86 users should check out Ernst Mayer's and the for guidance as to which code is best for their platform. Some software has been written for NVIDIA and AMD GPUs. Visit for more information. 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 for discovering a new Mersenne prime!.
If you have not done so,. It's optional, but required to and to assign computers to your user ID. Download the appropriate free program for your OS and proceed to Step 3:, or one of the other special versions listed below. Today's computers are not perfect. Even brand new systems from major manufacturers can have hidden flaws. If any of several key components such as CPU, memory, cooling, etc. Are not up to spec, it can lead to incorrect calculations and/or unexplained system crashes.
Overclocking is the practice of increasing the speed of the CPU and/or memory to make a machine faster at little cost. Typically, overclocking involves pushing a machine past its limits and then backing off just a little bit. For these reasons, both non-overclockers and overclockers need programs that test the stability of their computers.
This is done by running programs that put a heavy load on the computer. Though not originally designed for this purpose, this program is one of a few programs that are excellent at stress testing a computer. The has an excellent overview on using Prime95 to test your system and ensure it is working properly. The tips presented there should be helpful regarding how long to run the torture test and provide a solid guideline on how long to run the Prime95 stress test. Performing a stress test is simple:. and unzip the files to your desired location. Run the Prime95 executable and select 'Just Stress Testing' when asked.
The default options are sufficient to do a well balanced stress test on the system. Wholesale the crystal bible by judy hall. Upgrade Instructions for Existing Users If you are upgrading from version 24, then get needed to first upgrade to the latest version. Upgrade Instructions for upgrading from v24 (or older) to current versions.
If you have not done so,. Optional, but required to link your v4 account(s) to keep work credit earned prior to.
You can then and to your new PrimeNet v5 ID. All of your V4 computers will appear as a single virtual V5 computer, called v4computers. Each v4 account linked should:.
Appear in the list of linked accounts on the v4 migration page. Associate one v4computers virtual CPU on your v5 account for each v4 account linked. Note that the v4computers virtual CPU is initially assigned to ANONYMOUS until you link your v4 account. Create TWO fat CPU credits, one each for LL and TF, which contain the ENTIRE v4 credit accumulated prior to.
These two fat credits should appear on your v5 account summary page. Your V4 computers will continue to run, receive work assignments, return work results. We will soon provide a way to distribute V4 shared work credit with other V5 users. Some work credits may be applied or corrected after we complete our data reconciliation in late November.
Not linking your v4 and v5 accounts is optional, but your V4 computer(s) will run under the v5 ANONYMOUS user. Upgrading several computers incrementally over time is OK. There's no hurry.
To see each of your computers individually by name again you will need to upgrade the software. You can check the. Upgrade the software. You can upgrade even if you are in the middle of testing an exponent. Save file and prime.spl formats are different so there is no going back.
First allow the program to sync with PrimeNet to unspool and delete the prime.spl file of unsent results. Stop and exit the current version of the program.
You should make a backup copy of the entire directory before upgrading. Upgrading in the middle of P-1 stage 2 will restart stage 2 from scratch.
On dual and quad core machines, all CPUs are now managed by a single program instance. You must manually merge the worktodo.ini files into the v25 worktodo.txt (note the change in file suffix). In the instances of Prime95 you will no longer need, uncheck Start at Bootup before you exit the program. Save files must be copied to the new v25 directory. for your OS:, or one of the other ports listed below in the sections. 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. Restart the program. Questions and Problems Please consult the file for possible answers. You can also search for an answer, or ask for help in the. Otherwise, you will need to address your question to one of the two people who wrote the program.
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Networking and server problems should be sent to. 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, but please consult the forums first. Disclaimers See GIMPS. 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. 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 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 that you can use to help search for Mersenne primes. Other available freeware At this time, Ernst Mayer's program and Guillermo Ballester Valor's programs are the best choices for non-Intel architectures. Luke Welsh has a web page that points to of mostly historical interest you can use to help search for Mersenne primes.
Ever notice how people texting at night have that eerie blue glow? Or wake up ready to write down the Next Great Idea, and get blinded by your computer screen? During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun. F.lux f.lux fixes this: it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day. It's even possible that you're staying up too late because of your computer.
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