I just finished testing an exponent (M32391847) on a computer that had not returned any results for almost two years (since that computer is rarely on).

[QUOTE]UID: S277288/CED8C4F41, M24840883 is not prime. Res64: 450A9841CAF934**. Wc1: 248D802D,2090018,00000000
[B][Sun Apr 23 16:53:28 2006][/B]
Self-test 1792K passed!
[Mon Jun 12 20:49:35 2006]
UID: S277288/CED8C4F41, M32391847 completed P-1, B1=330000, B2=1650000, Wc1: 461CD2B4
[B][Fri Jan 18 12:41:24 2008][/B]
UID: S277288/CED8C4F41, M32391847 is not prime. Res64: CACE5B6D7DFAC6**. Wc1: 967FDA53,13451935,00000000[/QUOTE]

Unfortunately, it wasn't prime. :(

[QUOTE=Mini-Geek;122835]It's not the standard self-test that makes sure your computer is stable. It's a special self-test because the number was just outside of the range. It's not common, in fact it's the first I've had to do that in 11 tests (and, statistically speaking, should be far rarer than 1 in 11). Therefore, it's unlikely that you would have it in your results.txt file. Here it is from my results.txt: [code]Trying 1000 iterations for exponent 39509597 using 2048K FFT.
If average roundoff error is above 0.2425, then a larger FFT will be used.
Final average roundoff error is 0.24118, using 2048K FFT for exponent 39509597.[/code][/QUOTE]
The file whatsnew.txt explains when Prime95 tries to use a lower FFT size.
[QUOTE=whatsnew.txt][code]New features in Version 22.8 of prime95.exe
-------------------------------------------

1) Soft FFT crossovers have been implemented. If you test an exponent that
is within 0.2% of the old hard FFT crossover point, then 1000 test
iterations are run to determine if the smaller or larger FFT is
appropriate for the exponent. Although not recommended, you can adjust
prime95's behavior to be more aggressive using the SoftCrossover and
SoftCrossoverAdjust features discussed in undoc.txt.[/code]
[/QUOTE]

It would be interesting to find out how far you can exceed
the limit for a given FFT size before the chance of a fatal error
outweighs the % time increase for using the larger FFT size.

On the Jan. 15 update to the GIMPS (not Primenet) Top Producers list, I made it into the Top 500 for the first time. I was ranked #499 with 692.84 CPU years and 274 LL tests.

fork()

3860g, 52cm

[quote=S00113;125665]fork()

3860g, 52cm[/quote]

Congratulations! Watch out for that first nappy change!

btw I think 'fork()' would make a great name.

Just passed 3000 P90 CPU years of LL testing.[CODE]Account ID LL P90* Exponents Fact.P90 Exponents P90 CPU
CPU yrs LL Tested CPU yrs* w/ Factor hrs/day
-------------- ------- --------- -------- --------- -------
patrik 3001.28 1914 100.326 105 8057.55[/CODE]

[code]
Last activity : 07 May 2008 17:39 UTC
Account created: 07 May 1998 16:45 UTC
[/code]

10 years of work! :smile:

Just passed 600 years of LL ... need the Quad to make top 500 I think.

This is my 2,002nd posting since joining mersenneforum.org in August of the year 2002.

I completed my 300th LL test:

[CODE]20004709 67 D 0x________________ 29-May-08 06:41 CD69AEA7D[/CODE]