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New Prime95- version 26.3, build 3

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#1
A new version of Prime95 has been released.
Version 26.3, build 3

x86 version: p95v263.zip

64 bit version: p64v263.zip

New features in Version 26.3 of prime95.exe
-------------------------------------------

1) A few crash bugs were fixed that affected only some CPU architectures and some
FFT lengths. Other minor bugs were fixed.

Enjoy :)

EDIT: Thank You, stasio, for keeping this thread updated.:)
 
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#2
Prime95 v26.4

ftp://mersenne.org/gimps/p95v264.zip
ftp://mersenne.org/gimps/p64v264.zip

1) The length 160K x87 FFT crashes. Fixed in 26.3 build 2.
2) The length 4M FFT crashes on Northwood and Willamette Pentium 4. Fixed in 26.3 build 3.
3) On a brand new install, the default on hyperthreaded machines was 2 threads per worker. This was slower for most users. In the next release, the default will be 1 thread per worker.
4) Testing 522*928^24576-1 in 64-bit executables crashes. Fixed in 26.4.
5) You cannot edit the affinity settings from the Linux menus. Fixed in 26.4.
6) Running a multi-threaded torture test on AMD machines failed. Fixed in 26.4.
7) Setting a specific FFT length in worktodo.ini sometimes selects the next larger FFT length. This would most commonly occur when an exponent being tested is near the FFT crossover point and a specific FFT length is automatically chosen based on the roundoff error in the first 1000 iterations. Fixed in 26.4.
8) Multi-line additional information from the Primenet server was not parse properly. Only the first line was parsed. Thus, when successfully completing a double-check only the successful completion was written to prime.log. The cpu credit amount was not written to prime.log. Fixed in 26.4.
9) When doing PRP on non-base-2 numbers the time estimate in Test/Status was off by a factor of log2(base). Fixed in 26.4.
10) On a 32-bit Mac, some FFT implementations were missing. Fixed in next release.
 
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#3

Its working. My q9550 is producing such a little amount of heat. That my temps barly drop like 5-8c after i stop prime 95.

and All my cores stay at or under 40c at full load, for hours.

yay prime 95!!!!!
 
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#6
Thank you stasio. I found 26.4 x64 once but lost it and all I could find was the x86 version.
 
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#7
Prime95 v26.5

ftp://mersenne.org/gimps/p95v265.zip
ftp://mersenne.org/gimps/p64v265.zip

1) Pentium 4s and Celerons with L2 cache size of 256K or less choose a length 4M FFT when they could use an FFT between 1600K and 4M in size. Fixed in next release.
2) The on screen message reporting that errors have occurred during the LL test was wrong. The counts for "SUM(INPUTS) != SUM(OUTPUTS)" and "ROUNDOFF > 0.4" were reversed. Fixed in next release.
3) Dual-boot users running a 32-bit and 64-bit executable on the same exponent may experience "Unable to initialize FFT" message. This happens when prime95 writes an FFT size to worktodo.txt and that FFT size is only supported by just one of the two executables. For example, the 2240K FFT length is supported for 64-bit Core 2 but not 32-bit Core 2. Fixed, somewhat inelegantly, in 26.5 -- unimplemented FFT lengths are ignored when worktodo.txt is read.
4) Prime95 will sometimes inexplicably unreserve exponents. I think this happens when prime95 incorrectly calculates the CPU speed. Version 26.5 will only use a new slower CPU speed measurement after several slower CPU measurements. Hopefully, this will resolve the unreserve problem caused by a single erroneous CPU speed measurement.
5) Prime95 would lose the how_far_factored and tests_saved information on PRP= lines in worktodo.txt. Fixed in 26.5.
5) Prime95 did not offer an option to delete P-1 save files when a work unit completes. Fixed in 26.5.
6) Prime95 did not fully understand Sandy Bridge CPUID output. Fixed in 26.5.
7) Prime95 did not accurately report the CPU speed. Fixed in 26.5.
8) At startup, the workers threads do not start up properly until communication with the server completes. If you have a large worktodo.txt file, this will result in wasted CPU time and many "use count" error messages. Fixed in 26.5.
9) Time estimates for trial factoring to 2^79 and above were incorrect. Fixed in 26.5.
 
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#8
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#9
Prime95 v26.5 Build 3

ftp://mersenne.org/gimps/p95v265.zip
ftp://mersenne.org/gimps/p64v265.zip

Starting with build 3, at startup the program tries to determine which
hyperthreaded logical CPUs comprise one physical CPU. If this isn't working
properly, see the AffinityScramble2 setting in undoc.txt. The previous
version's AffinityScramble setting is no longer supported!
 
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#11
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#12
Prime95 v26.6 Build 1-x64 only

ftp://mersenne.org/gimps/p64v266.zip

-For rare cases where the program cannot figure out the number of cores and hyperthreading,
the NumPhysicalCores option may help.
 
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#13
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#14
Prime95 v26.6 Build 3

ftp://mersenne.org/gimps/p95v266.zip
ftp://mersenne.org/gimps/p64v266.zip

http://www.mediafire.com/?1m7y1kfv9vbj618

1) Occasionally, P-1 stage 2 would report 100% complete before stage 2 completed. This bug has been around forever. I've finally found the cause! Fixed in 26.5 build 2.
2) Worktodo.txt was not updated properly when P-1 completed for a PRP test. Fixed in 26.5 build 3.
3) In 26.5 build 3, when benchmarking and measuring CPU speed the program will keep all cores busy by launching auxiliary threads that loop indefinitely. This should prevent Intel Turbo boost from kicking in. This should prevent cases where the CPU speed is reported as 1.87 GHz, yet a benchmark reports very fast timings because the CPU core has been boosted to 3.2 GHz because only one core is active.
4) In 26.5 build 3, the OS's mapping of hyperthreaded logical CPU numbers to physical CPUs is determined automatically at startup. The AffinityScramble setting (see undoc.txt) is no longer supported. It is replaced by the AffinityScramble2 setting.
5) In 26.5 build 3, the message "set affinity to run on any cpu" instead listed all the CPU numbers and as well as CPU #31. Fixed in build 4.
6) In 26.5 build 3 and 4, benchmarking a dual-core non-SSE2 machine will crash. Fixed in build 5.
7) KeepPminus1SaveFiles=0 option described in undoc.txt did not work when a factor was found. Fixed in 26.6.
8) The 32K,64K,80K length FFTs with sumout checking for Pentium 4's with 256K or less cache were not implemented. Symptom is a torture test failure. Fixed in 26.6.
9) Prime95 does not load on Sandy Bridge CPUs running Win XP. I've got a trial fix in 26.6.
10) Prime95 chooses very inefficient FFT implementations for Core 2 Celerons (they have 512K L2 cache). Working on a fix for for 26.6.
11) Logical CPU numbers were sometimes output zero-based and sometimes one-based. In 26.6, they are all one-based.
 
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#15
Prime95 v27.1 Build 1

ftp://mersenne.org/gimps/p95v271.zip

From developer:
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!
 
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#16
Prime95 v27.3 Build 1

ftp://mersenne.org/gimps/p95v273.zip
ftp://mersenne.org/gimps/p64v273.zip

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.
 
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#17
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#18
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#22
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#23
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#24
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#25
Prime95 v27.7 Build 2


Windows 64-bit: ftp://mersenne.org/gimps/p95v277.win64.zip
Windows 32-bit: ftp://mersenne.org/gimps/p95v277.win32.zip

1. 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.