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Old 2012-04-25, 03:34   #1
Prime95
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Default Prime95 version 27.6

Prime95 version 27.6 build 4 is available. If no major problems are reported it will become the official GIMPS client.

What's new? Multithreading in pass 1 has been overhauled. It might be a little faster especially when running many threads as the threads are less dependent on one another. Also, the FFT crossovers have been tweaked.

This version also fixes a number of mostly minor bugs in 27.4 (see http://mersenneforum.org/showpost.ph...83&postcount=2).

Download links:
Windows 64-bit: ftp://mersenne.org/gimps/p64v276.zip
Windows 32-bit: ftp://mersenne.org/gimps/p95v276.zip
Linux 64-bit: ftp://mersenne.org/gimps/mprime276-linux64.tar.gz
Linux 32-bit: ftp://mersenne.org/gimps/mprime276.tar.gz
Mac OS X: ftp://mersenne.org/gimps/Prime95-MacOSX-276.zip
FreeBSD 64-bit: ftp://mersenne.org/gimps/mprime276-FreeBSD64.tar.gz
Source code: ftp://mersenne.org/gimps/source276.zip
Windows 64-bit service: ftp://mersenne.org/gimps/win64nt276.zip
Windows 32-bit service: ftp://mersenne.org/gimps/winnt276.zip

It would be useful to run a few multithreaded doublechecks.

Last fiddled with by Prime95 on 2012-05-02 at 01:12
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Old 2012-04-25, 03:36   #2
Prime95
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1. A slower trial factoring algorithm is chosen sometimes. Fixed in version 27.6 build 2.
2. The round off error can be incorrectly calculated. Fixed in 27.6 build 3.
3. Mprime -v does not print out the build number. Fixed in version 27.6 build 4.
4. Torture test on small FFTs gets round off errors or crashes after a while. Partially fixed in version 27.6 build 4.
5. Torture test on small FFTs gets round off errors or crashes after a while. In very rare cases, regular tests could crash or raise a round off error. Fixed in version 27.7.
6. Multithreaded FFTs could deadlock. Fixed in version 27.7.

Last fiddled with by Prime95 on 2012-05-04 at 01:51
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Old 2012-04-25, 04:53   #3
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http://www.mersenneforum.org/gimps/

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Old 2012-04-25, 05:38   #4
ixfd64
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What happened to version 27.5?
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Old 2012-04-25, 05:50   #5
LaurV
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Quote:
Originally Posted by Xyzzy View Post
Be-a-utiful!!

[offtopic] I tried the "slash mfaktc" and it is working too, but tried "slash cudalucas" and got the rabbit with the pancake between the ears. Any idea?[/offtopic]

edit:
@George: just to make it clear, for me and others, "official" means that core2 workers should update too? (gains? penalties? would they feel the speedup, or is only for heavy artillery like AVX?) or they should better live with v26?

Last fiddled with by LaurV on 2012-04-25 at 05:55
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Old 2012-04-25, 06:09   #6
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Default Trial factoring slows down?

I just did some benchmarks on both version 26.6 and 27.6. It turned out that the result puzzled me a lot. On my laptop (running 64-bit Windows 7), the benchmark results are normal. But on my desktop (running 32-bit Windows XP), it seems that trial factoring significantly slows down on version 27.6.
All results are attached.
Attached Files
File Type: zip results.zip (4.1 KB, 135 views)
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Old 2012-04-25, 07:13   #7
Dubslow
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Quote:
Originally Posted by ixfd64 View Post
What happened to version 27.5?
Take a look at the link George posted to the list of bug fixes; gwnum went through a 27.5 revision which fixed Bulldozer, but Prime95 was not re-released.
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Old 2012-04-25, 10:08   #8
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Quote:
Originally Posted by Dubslow View Post
Take a look at the link George posted to the list of bug fixes; gwnum went through a 27.5 revision which fixed Bulldozer, but Prime95 was not re-released.
So 27.6 works with Bulldozer's AVX? Anyone did a benchmark already?
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Old 2012-04-25, 10:41   #9
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Buldozder AVX ? I must test it rihgt now!
and new version of llr is also "on the way"?
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Old 2012-04-25, 13:55   #10
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I guess this solves my quandry about my new laptop. I'll put this new version on when I get it and it will be better all around.
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Old 2012-04-25, 14:21   #11
Prime95
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Quote:
Originally Posted by BigBrother View Post
So 27.6 works with Bulldozer's AVX? Anyone did a benchmark already?
Bulldozer uses the SSE2 FFTs. AVX FFTs on Bulldozer are slower than the SSE2 FFTs.
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