Great Internet Mersenne Prime Search GIMPS Finding World Record Primes Since 1996
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Free Mersenne Prime Search Software
Prime95 Version 30.19 build 20
Prime Movie -
Elias, a projectionist with ink-stained fingers and a permanent squint, lived for the rhythmic click-clack of the reels. In a world of instant streaming and digital ghosts, the Prime was a cathedral of light and dust.
The projector roared, the light grew blinding, and as the reel reached its end, the theater fell silent. When the usher checked the booth five minutes later, the projector was empty, and the only thing left was a single, silver canister lying on the floor, still warm to the touch. Prime Movie
He watched his own digital shadow on the screen as he stood in the booth. On the screen, a door behind him opened. Elias spun around in the real world. The booth was empty. But on the screen, a figure in a heavy trench coat was standing directly behind him, reaching out. Elias, a projectionist with ink-stained fingers and a
The neon hum of the "Prime Movie" theater was the only thing keeping the fog at bay in the rain-slicked city of Oakhaven. It wasn't just a cinema; it was the last place on Earth where you could see a film on actual celluloid.
The temperature in the booth plummeted. Elias looked back at the screen and saw the figure whisper into his ear. At that exact moment, he felt a cold breath against his neck.
Elias realized the Prime Movie wasn't showing a story; it was consuming one. He was the lead actor now, and the third act was just beginning. He reached for the power switch, but his hand passed right through it like smoke. He looked down and saw his boots turning into flickering gray pixels.
Elias, a projectionist with ink-stained fingers and a permanent squint, lived for the rhythmic click-clack of the reels. In a world of instant streaming and digital ghosts, the Prime was a cathedral of light and dust.
The projector roared, the light grew blinding, and as the reel reached its end, the theater fell silent. When the usher checked the booth five minutes later, the projector was empty, and the only thing left was a single, silver canister lying on the floor, still warm to the touch.
He watched his own digital shadow on the screen as he stood in the booth. On the screen, a door behind him opened. Elias spun around in the real world. The booth was empty. But on the screen, a figure in a heavy trench coat was standing directly behind him, reaching out.
"Don't stop the film," the voice rasped, not from the speakers, but from the air itself.
The neon hum of the "Prime Movie" theater was the only thing keeping the fog at bay in the rain-slicked city of Oakhaven. It wasn't just a cinema; it was the last place on Earth where you could see a film on actual celluloid.
The temperature in the booth plummeted. Elias looked back at the screen and saw the figure whisper into his ear. At that exact moment, he felt a cold breath against his neck.
Elias realized the Prime Movie wasn't showing a story; it was consuming one. He was the lead actor now, and the third act was just beginning. He reached for the power switch, but his hand passed right through it like smoke. He looked down and saw his boots turning into flickering gray pixels.
CPU Stress / Torture Testing
Prime95 has been a popular choice for stress / torture testing a CPU since its introduction, especially with overclockers and system builders.
Since the software makes heavy use of the processor's integer and floating point instructions, it feeds the processor a consistent and verifiable
workload to test the stability of the CPU and the L1/L2/L3 processor cache. Additionally, it uses all of the cores of a multi-CPU / multi-core
system to ensure a high-load stress test environment.
From the most recent "stress.txt" file included in the download:
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 Prime95 Wikipedia page 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.
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.
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 . 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 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 (37.7MB). This file includes all the version 30.19b21 source code for Windows, Linux, FreeBSD, and Mac OS X. Last updated: 2024-09-14.
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
is the best choice 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.
