unusually low P-1 bounds
 

Several of my computers are currently doing P-1 factoring in the 53.8M range. I usually allocate 384 MB of memory per core, and the bounds I get are usually B1=630000, B2=16222500 (4.2385 GHz-days).

However, I recently requested a few P-1 assignments in the 50.1M range manually, and the bounds for those are B1=280000, B2=5460000 (only 1.4934 GHz-days).

Is this normal? For the record, the bounds I get for a 49M exponent are B1=570000, B2=14107500 (3.2916 GHz-days).

[QUOTE=ixfd64;257130]Several of my computers are currently doing P-1 factoring in the 53.8M range. I usually allocate 384 MB of memory per core, and the bounds I get are usually B1=630000, B2=16222500 (4.2385 GHz-days).[/QUOTE]Presumably, those exponents had not yet been LLed, so the last parameter on their worktodo Pfactor lines was 2 (finding a factor saves 2 LLs) -- right?

[quote]However, I recently requested a few P-1 assignments in the 50.1M range manually, and the bounds for those are B1=280000, B2=5460000 (only 1.4934 GHz-days).[/quote]Had those exponents already been first-time LLed? What's the last parameter on their worktodo lines?

The worktodo.txt format is:

Pfactor=<assignment key>,1,2,<exponent>,-1,68,2

[QUOTE=cheesehead;257133]
[QUOTE]However, I recently requested a few P-1 assignments in the 50.1M range manually, and the bounds for those are B1=280000, B2=5460000 (only 1.4934 GHz-days).[/QUOTE]

Had those exponents already been first-time LLed? What's the last parameter on their worktodo lines?[/QUOTE]
These ones had a prior LL test - there may have been others with slightly different bounds than ixfd64's example.
[CODE]Exponent Status Data

50175679 No factors below 2^69
P-1 B1=280000, B2=5460000
Unverified LL 9CA5E2E3BBEB38__ by "mister_phil" on 2010-12-25
History 9CA5E2E3BBEB38__ by "mister_phil" on 2010-12-25
History B1=280000, B2=5460000 by "ixfd64" on 2011-03-31

50185963 No factors below 2^69
P-1 B1=280000, B2=5460000
Unverified LL AC782724D87460__ by "ANONYMOUS" on 2010-08-31
History AC782724D87460__ by "ANONYMOUS" on 2010-08-31
History B1=280000, B2=5460000 by "ixfd64" on 2011-03-30

50175679 No factors below 2^69
P-1 B1=280000, B2=5460000
Unverified LL 9CA5E2E3BBEB38__ by "mister_phil" on 2010-12-25
History 9CA5E2E3BBEB38__ by "mister_phil" on 2010-12-25
History B1=280000, B2=5460000 by "ixfd64" on 2011-03-31

50185963 No factors below 2^69
P-1 B1=280000, B2=5460000
Unverified LL AC782724D87460__ by "ANONYMOUS" on 2010-08-31
History AC782724D87460__ by "ANONYMOUS" on 2010-08-31
History B1=280000, B2=5460000 by "ixfd64" on 2011-03-30
[/CODE]

[QUOTE=ixfd64;257170]The worktodo.txt format is:

Pfactor=<assignment key>,1,2,<exponent>,-1,68,2[/QUOTE]for the 50.1M exponents?

[QUOTE=cheesehead;257204]for the 50.1M exponents?[/QUOTE]

Yes.

Do you happen to have a saved copy of the Pfactor assignment lines you received for the 50.1M exponents that you can post?

Here's two of them:

[QUOTE]Pfactor=A5E36281D18ADB9E5C6C5FAD90B9DE87,1,2,50171491,-1,69,1
Pfactor=38FD532B5233142BCF520A0FA832B338,1,2,50175119,-1,69,1[/QUOTE]

[QUOTE=ixfd64;257330]Here's two of them:[/QUOTE]
It's the ,1 at the end that causes the difference. That is the number of LL tests that will be saved by running the P-1 test. On an exponent that has never been LL tested, that number would normally be 2 (the LL and the LL-D) instead of 1. Prime95/mprime set their bounds based on how many LL tests are assumed to be saved in the event of success. You can pick numbers between 0 and 10, though I guess picking 0 wouldn't make much sense, would it...? :smile:

[QUOTE=ixfd64;257330]Here's two of them:[quote]Pfactor=A5E36281D18ADB9E5C6C5FAD90B9DE87,1,2,50171491,-1,69,1
Pfactor=38FD532B5233142BCF520A0FA832B338,1,2,50175119,-1,69,1 [/quote][/QUOTE]So, the answers to some of my previous questions should (:-) have been:

[QUOTE=cheesehead;257133][QUOTE=ixfd64;257130]However, I recently requested a few P-1 assignments in the 50.1M range manually, and the bounds for those are B1=280000, B2=5460000 (only 1.4934 GHz-days).[/QUOTE]Had those exponents already been first-time LLed? What's the last parameter on their worktodo lines?[/QUOTE]Answers: yes, 1 :-)

[QUOTE=cheesehead;257204][QUOTE=ixfd64;257170]The worktodo.txt format is:

Pfactor=<assignment key>,1,2,<exponent>,-1,68,2[/QUOTE]for the 50.1M exponents?[/QUOTE]Answer: No, for those exponents the last parameter was 1 rather than 2. :-)

... which would have more quickly led to the reason for their P-1 limits being lower than for your 53.8M exponents.