20210308, 19:56  #1 
Mar 2004
2^{2}·3^{3}·5 Posts 
Going back to PRP
I have two 100M digit assignments that, after starting the PRP tests, I've noticed they have not gotten P1 done (and on some computers, I never get P1 even when P1 was never done on the exponents). The assignments are at 24.0% and 31.8%, respectively. Is it at all worth doing P1 factoring on either of these assignments at this point?

20210308, 20:21  #2  
∂^{2}ω=0
Sep 2002
República de California
19×613 Posts 
Quote:
If that's not what's happening in your case, can you give us an example for an exponent for which your run didn't do p1, even though it should have? 

20210308, 20:24  #3  
Mar 2004
540_{10} Posts 
Quote:
(And my apologies for posting in the wrong section.) Last fiddled with by JuanTutors on 20210308 at 20:25 

20210308, 20:56  #4  
Mar 2004
2^{2}×3^{3}×5 Posts 
Quote:


20210308, 21:43  #5 
∂^{2}ω=0
Sep 2002
República de California
2D7F_{16} Posts 
Ah, you're doing 100Mdigit work  I don't know what the default p1 protocol for those is supposed to be. PMing George to see if he can clarify.

20210308, 22:39  #6  
P90 years forever!
Aug 2002
Yeehaw, FL
19·397 Posts 
Quote:
I suppose if you're not letting prime95 use enough memory to do a useful P1 stage 2 (prime95's default setting), then prime95 could well have decided not to run P1 given the deep trial factoring already done. 

20210308, 22:41  #7  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
5,437 Posts 
Quote:
Upgrade to v30.4b9. Set allowed memory usage by P1/ECM to something reasonable. More is often better, up to a point. Default prime95 settings are generally too low for adequate P1 bounds. They're set conservatively low to create less trouble on lowram systems IIRC. See https://www.mersenne.ca/exponent/332292529 for suitable bounds. I often give it 1/2, 3/4 or more of system ram. The attached example is a 16GB system which also runs multitab web browser & Colab instances, lots of remote desktop sessions, office apps, etc. See also https://www.mersenneforum.org/showpo...8&postcount=22, https://www.mersenneforum.org/showpo...4&postcount=17, and (even though it's gpuoriented, its conclusions also apply in cpu P1) https://www.mersenneforum.org/showpo...9&postcount=20 Seems to me this thread belongs in the software subforum, or a prime95 subforum, not the PrimeNet subforum. Last fiddled with by kriesel on 20210308 at 23:23 

20210309, 04:18  #9 
Mar 2004
2^{2}×3^{3}×5 Posts 
Thanks! I'll look out for it and for any bug fixes. Now to the question of whether it's worth doing P1 on an exponent that is 31.8% done with PRP, is it worth it? Could/should I set the number of tests saved to a decimal like 1  0.318 = .612?

20210309, 06:25  #10  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
12475_{8} Posts 
Quote:
The issue identified affects PRP only, not PRPCF or LL or P1? "I consider this pretty stable software." https://mersenneforum.org/showpost.p...51&postcount=1 "30.4 seems stable enough to make the transition." https://mersenneforum.org/showpost.p...7&postcount=88 "@Kriesel: Please consider prime95 version 30.4 for your P1 efforts" https://mersenneforum.org/showpost.p...&postcount=111 Quote:
Code:
You can do "optimal" P1 factoring of k*b^n+c by adding lines to worktodo.txt: Pfactor=k,b,n,c,how_far_factored,num_primality_tests_saved For example, Pfactor=1,2,10000157,1,64,2.0 Last fiddled with by kriesel on 20210309 at 06:55 

20210309, 09:55  #11  
P90 years forever!
Aug 2002
Yeehaw, FL
19·397 Posts 
Quote:
Stick with 30.4 but keep an eye on any boxes nearing PRP completion. No wrong answers are produced, just repeated roundoff errors. This makes it unsuitable for setandforget installation. This is an example of why I wait a fairly long while before making a seemingly stable release the version available on the mersenne.org download page. Last fiddled with by Prime95 on 20210309 at 09:57 

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