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Prime95 v27.xx
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TSstasio
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 Dec 7 2011, 04:33 PM
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Prime95 v27.1 Build 1
-(64bit) ftp://mersenne.org/gimps/p95v271.zipFrom developer: QUOTE A very early pre-beta prime95 version 27.1 is available. It has support for most, but not all AVX FFT lengths. I have not done any of the 64-bit optimizations.
I've been using this version on my Sandy Bridge for the last few days without incident. You are free to do so too. I'm fairly confident it will produce valid results as it has passed some torture testing and QA runs. If you do not have a Sandy Bridge CPU (or maybe a Bulldozer) there is absolutely no reason to download this version. In fact it would be dangerous to do so as I have not tested the SSE2 or x87 FFTs to see if I've broken something! This post has been edited by stasio: Dec 7 2011, 04:48 PM
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TSstasio
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Feb 17 2012, 12:56 PM
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Prime95 v27.3 Build 1ftp://mersenne.org/gimps/p95v273.zipftp://mersenne.org/gimps/p64v273.zip» Click to show Spoiler - click again to hide... « This version supports 64-bit optimized AVX FFTs. 32-bit AVX FFTs are also a little bit faster. I haven't done full benchmarks so I'm not sure how much faster it is than versions 27.2 or 26.6.
The good/bad news is these FFTs are so fast that they are limited by memory bandwidth -- standard Sandy Bridge CPUs will experience a slow down when running all 4 cores. I'd like to hear from Sandy Bridge-E users to see if they also suffer slow downs when all 4 cores are running. This post has been edited by stasio: Feb 17 2012, 12:57 PM
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TSstasio
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Mar 9 2012, 11:23 AM
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Prime95 v27.4 Build 1ftp://mersenne.org/gimps/p95v274.zipftp://mersenne.org/gimps/p64v274.zip» Click to show Spoiler - click again to hide... « This version fixes a number of bugs in 27.3 - mostly related to LLR and PFGW issues. There are no speed improvements over 27.3. Hopefully, Bulldozer processors now properly run SSE2 FFTs.
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TSstasio
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Apr 27 2012, 09:11 AM
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Prime95 v27.6 Build 2ftp://mersenne.org/gimps/p95v276.zipftp://mersenne.org/gimps/p64v276.zip1. A slower trial factoring algorithm is chosen sometimes. Fixed in version 27.6 build 2.
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TSstasio
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May 16 2012, 10:08 AM
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Prime95 v27.7 Build 2
http://mersenneforum.org/showthread.php?t=16779Windows 64-bit: ftp://mersenne.org/gimps/p95v277.win64.zipWindows 32-bit: ftp://mersenne.org/gimps/p95v277.win32.zip1. SoB cannot package a default prime.txt with the Mac OS X version because the Mac version changes the working directory to ~/Prime95. Mac version changed to copy a prime.txt file from the application bundle to ~/Prime95. Fixed in version 27.7 build 2. 2. Root cause of several false prime reports in recent years found. Fixed in version 27.7 build 2. This post has been edited by stasio: May 16 2012, 10:15 AM
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