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-   -   P-1 factoring != "Mersenne numbers to factor"? (https://www.mersenneforum.org/showthread.php?t=2480)

 James Heinrich 2004-05-16 23:27

P-1 factoring != "Mersenne numbers to factor"?

How can I do P1 factoring only, the part that takes large quantities of RAM? I thought that choosing only "Mersenne numbers to factor" would do it, but that seems to be only factoring that doesn't require much RAM. I have plenty of RAM in one of my machines and would like to make use of it so that people with less RAM don't have to do the P1 factoring part, they can go straight to LL. Is this possible? I suppose I could just grab exponents and then manually unreserve them once the P1 part is done, but that seems silly...

Or am I trying to do something pointless? :unsure:

 Uncwilly 2004-05-17 00:21

There are a few ways to try to do P-1 only.

there have been attempts to do P-1 in a semi-auto mode. See this

There is more discussion here.

What you are talking about is not pointless. As a matter of fact, there are several folks that are trying to "clean-up" all exponents that have had 1 L-L, but weren't P-1'ed. This can help save DC'ing time. With lots of RAM, you could help. Look att this subforum [URL=http://mersenneforum.org/forumdisplay.php?f=30]http://mersenneforum.org/forumdisplay.php?f=30[/URL]

 James Heinrich 2004-05-17 00:43

Thanks [i]Uncwilly[/i].

I look forward to the time when it's an integrated part of the client itself :smile:

I look forward to the time when it's an integrated part of the client itself :smile:[/QUOTE]
(1) It's actually mostly a deficit in the server. The PrimeNet server has not had the capability to hand out P-1 (only) assignments, so there was no point in having the Prime95 client offer to get P-1 (only) assignments.

(2) When Prime95 was originally written, it did not include any capability to perform P-1 (or ECM) factoring. The only factoring method it offered was "trial factoring", and none of the messages bothered to include the qualifier "trial" -- so all messages referred to simply "factoring" or "factor". Later, when P-1 and ECM factoring were added, the existing messages were not changed, so an unqualified "factor" or "factoring" still meant only [i]trial[/i] factoring, but the user is not explicitly informed of this by the documentation. :sad:

I tried to amend my preceding message to say that the situation is the fault of [i]both[/i] the server and the client, but the editing deadline had expired.

 dave_0273 2004-05-17 04:40

I would love to have you helping out in the Mersenne-Aries work. I am obsessed with p-1 testing and that is what I have both of my p4s on. The only disadvantage about doing this is that about once a week you manually have to submit results and update worktodo.ini but that only takes about a minute.

But the decision is up to you. You won't find a new prime this way but I find it more exciting than LL testing.

 James Heinrich 2004-05-17 04:52

The chance of me finding a prime anyway is what, 1/200000, so I'm not worried much about losing that chance :smile:

I assume the [url=http://mersenneforum.org/showthread.php?s=&postid=11671#post11671]above-mentioned post[/url] is still the best method to engage in this testing? If not, or if you have any suggestions please let me know.

 markr 2004-05-17 06:27

I found the semi-automatic method described in the "above-mentioned post" was not very useful - most exponents in the current primenet ranges have been P-1'd, thanks in large part to the Mersenne-aries - see [URL=http://mersenneforum.org/forumdisplay.php?f=30]their subforum[/URL] of the Data forum. They'd love to have you on board - there's plenty more P-1 to do!

 dave_0273 2004-05-17 11:09

[QUOTE=James Heinrich]The chance of me finding a prime anyway is what, 1/200000, so I'm not worried much about losing that chance :smile:

I assume the [url=http://mersenneforum.org/showthread.php?s=&postid=11671#post11671]above-mentioned post[/url] is still the best method to engage in this testing? If not, or if you have any suggestions please let me know.[/QUOTE]

No, that method is pretty much useless now. The best way to do p-1 facoring is the mersenne-aries sub forum. (Go into data and then into Marin's Mesenne-Aries). If you would like bigger blocks of 50, just let me know. There are literally 1000s of p-1 work to do so there is heaps to go around

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