Strange Expected Completion Dates
 

I have two exponents that I am currently testing: 42510241 and 42512803.

When I started up about seven hour ago, both these exponents were around 5% complete (P-1 Stage 1). Now, the first is showing 34% complete and the second is 42%.

Why is it that the expected completion date is December 22 for both values?

Doesn't really make sense.

:question:

This is the percent completion of the P-1 Stage 1 test (which is a very small part of the complete test). The expected completion date makes fairly good sense. You can trust it.

My work type is Lucas Lehmer as selected by the server. Based on what I read, P-1 Stage 1 is all that will be done?

When you select LL you may get an LL assignment that has NOT already had the P-1 done. In this case your computer will first do the P-1 stage 1 AND stage 2 (unless you have allocated too little memory); get credit for that work and THEN proceed with the LL immediately after without any intervention from you.

P-1 typically takes a few days.
LL will take weeks or months depending on the size of the exponent, speed of the CPU and hours per day you run it.

I have 2 GB total RAM. The system grabs 256 MB at startup for its own use. By the time everything is loaded, I typically have just over 1.3 GB available. I have P95's memory allocation set to 512 MB, regardless of time of day. Is that enough to run stage 2?

[QUOTE=storm5510;185146]I have P95's memory allocation set to 512 MB, regardless of time of day. Is that enough to run stage 2?[/QUOTE]

Yes

[quote=Prime95;185158]Yes[/quote]
the more the better though

These are new to me.

[quote]Stage 1 GCD complete. Time: 138.578 sec.[/quote]I feel I should know what "GCD" is, but I don't.

[quote]Processing relative primes (64 of 480 already processed).[/quote]I'm not sure what "relative" means in this context?

If there is somewhere I can read all this instead of asking, point the way...

[quote=storm5510;185412] If there is somewhere I can read all this instead of asking, point the way...[/quote]
[URL]http://mersennewiki.org/index.php/P-1_Factorization_Method[/URL]

explains the P-1 method. (It has "Step 1" and "Step 2" instead of "Stage 1" and "Stage 2".)

(Hmmm... Perhaps no one's told you about mersennewiki.org)

[quote]I feel I should know what "GCD" is, but I don't.[/quote]"Greatest Common Divisor" was on the tip of your tongue.

[quote]I'm not sure what "relative" means in this context?[/quote]I think "relative primes" has something to do with the exponentiation operations involving "C+[I]integer[/I]" in the [B]Step 2[/B] (Stage 2) explanation at the link given above, but I can't say exactly what.

"Mr. P-1" probably knows.

I note that someone's inquiry about relative primes at [URL]http://mersenneforum.org/showthread.php?t=11592[/URL] last March has never been answered.

Thread [URL]http://mersenneforum.org/showthread.php?t=11387[/URL] mentions relative primes but never defines them.

[quote=cheesehead;185422]"Greatest Common Divisor" was on the tip of your tongue...[/quote]

Well, I got the first two right. I guessed Denominator.

Thanks for the links. :smile:

[quote=storm5510;185450]Well, I got the first two right. I guessed Denominator.[/quote]Actually, you were right on all three.

Denominator (of a fraction that represents a division) = Divisor (of a division corresponding to a fraction) and both have initial "D".