[QUOTE=Dubslow;293145]I think it's like this: There are a certain number of k's for which one factor is between B1 and B2, while the other factors are <B1. Imagine a list:

K1
K2
K3
K4
K5
K6
etc...

Lets assume that this is a list of Ks with a factor >B2, in order. Now, bear in mind that this is a very very rough analogy, but I [I]believe[/I] it's something like with 480 RPs, you are able to check every second K on that list with E=12. But with RPs <480, you can check if every third K is a factor. You can see then that with different RPs you check different K values, and it happens that this particular factor can be found with those given bounds and the right number of RPs. This is also why I said that BS is "random" with respect to what factors with K > B2* it can possibly find. Your computer is working just fine.

*Of course here I mean (one factor of K)>B2, but shorthand FTW!

Edit: Let me re-emphasize that this is a very stretched analogy based on a rough idea of the math. Anyone who's studied it is probably able to be more precise/accurate.[/QUOTE]
That makes sense. I'm running it one more time with no memory setting to see what happens (I wouldn't have done this, but I accidentally left the pminus1 line in and it was already at 63% S-1, so I changed it to [CODE]pfactor=N/A,1,2,54699223,-1,74,2[/CODE] and I'll let it finish. After that, I'll just let the system run away with normal settings (unless someone has a better suggestion :smile:)

[QUOTE=flashjh;292804]Ok, looking for some help here.

I have a machine that does nothing but P-1. I had UDIMM memory in it and the memory kept going bad, I was getting restarts, etc.

I replaced the UDIMM memory with RDIMM ECC memory on the KGPE-D16 QVL. The system has been very stable, but I noticed it stopped finding S-2 factors.

It had been so long since it found S-2 factor that I gave it [URL="http://mersenne-aries.sili.net/exponent.php?exponentdetails=54699223"]M54699223[/URL] to work on since Dubslow found one:



So when I ran it, the system didn't find the factor:

[CODE]
[Mon Mar 12 14:48:12 2012]
UID: flashjh/P1Main, M54699223 completed P-1, B1=475000, B2=9025000, E=12, We4: 878AB6EE
[/CODE]

My B2 was a little higher than Dubslow's, but that shouldn't matter, correct? Anyone have any ideas why the system isn't fining S-2 factors?[/QUOTE]

Same results as before:

[CODE]
[Fri Mar 16 03:48:54 2012]
UID: flashjh/P1Main, M54699223 completed P-1, B1=475000, B2=9025000, E=12, We4: 878AB6EE
[/CODE]

Relative primes (and max memory) is the difference. Dubslow, you seem to find a lot of BS factors, I wonder if less memory is actually better for P-1?

Just two, I think. I'm quite sure it's just statistical noise.


I do have my own problem though. Since switching to 27.4, all my P-1s have gone from E=12 to E=6 (except for like 2 or 3 out of 15+ total). I didn't change anything, and they all use up to 10,000 MB of RAM like I told flash. Any ideas? Because I have found those 2 BS factors, this does have me a bit more worried than it would otherwise. (George already said he did not modify the bounds algorithm.)

[QUOTE=Dubslow;293215] (George already said he did not modify the bounds algorithm.)[/QUOTE]

AVX FFTs consume a little more memory than SSE2 FFTs.

27.3 and 27.2 had E=12.

[QUOTE=Dubslow;293224]27.3 and 27.2 had E=12.[/QUOTE]

Curious. 27.4 uses a little less memory than 27.3.

I went forever without a S-2 factor and then it finds a S-1 and a S-2 in the same morning :smile:

[URL="http://mersenne-aries.sili.net/exponent.php?exponentdetails=52606901"]M52606901[/URL]
[URL="http://mersenne-aries.sili.net/exponent.php?exponentdetails=52591241"]M52591241[/URL]

[QUOTE=Dubslow;293215]Just two, I think. I'm quite sure it's just statistical noise.


I do have my own problem though. Since switching to 27.4, all my P-1s have gone from E=12 to E=6 (except for like 2 or 3 out of 15+ total). I didn't change anything, and they all use up to 10,000 MB of RAM like I told flash. Any ideas? Because I have found those 2 BS factors, this does have me a bit more worried than it would otherwise. (George already said he did not modify the bounds algorithm.)[/QUOTE]

Did you figure out the issue?

[QUOTE=flashjh;293584]
Did you figure out the issue?[/QUOTE]
Nope, it's randomly gone back to E=12, and for my most recent result (as of this post, the file is a symlink), it didn't print E at all.

[url]http://dubslow.tk/gimps/results.txt[/url]

It would be preferable if you guys wouldn't shorten Brent-Suyama to BS.
(B.Sc. to BS is OK, that's pretty much fair in my book.)

[QUOTE=Batalov;293589]It would be preferable if you guys wouldn't shorten Brent-Suyama to BS.
(B.Sc. to BS is OK, that's pretty much fair in my book.)[/QUOTE]
No problem :smile:

[BREAK]
Unbelievable... two S-2 in as many days:[CODE][Mar 20 05:31] P-1 found a factor in stage #2, B1=550000, B2=12650000, E=12.
[Mar 20 05:31] [URL="http://mersenne-aries.sili.net/exponent.php?exponentdetails=52605569"]M52605569[/URL] has a factor: 1499018992232168845493327[/CODE]

[QUOTE=Dubslow;293588]Nope, it's randomly gone back to E=12, and for my most recent result (as of this post, the file is a symlink), it didn't print E at all.

[url]http://dubslow.tk/gimps/results.txt[/url][/QUOTE]

Huh, it had one random E=6 overnight.


Nice going flash! Now I just need to find some...