20230404, 21:56  #67 
"Gary"
May 2007
Overland Park, KS
12,161 Posts 
Nice detailed analysis! A true stats nerd like me.
I downloaded TwinGenX. It's a very nice GUI program even from 2012! It's basically a modernized NewPGen for multicore, if you can call 2012 modernized at this point. I feel like it's aged well. I ran some parallel tests running TwinGenX on multiple cores vs. NewPGen's singlecore process. Everything matched very well. I was especially happy how well it sieves a widerange of k along with multiple n vs. NewPGen's singlen process. Of course this is all likely old news to you since I'm guessing you used it for sieving the original n=480K500K range here. I mostly concur with your percentages. I'd even put it at ~90% that the prime gods are just being mean to us. I still feel PRPnet is pretty low because I've run this version of PRPnet (5.3.2) for so long at NPLB and on my personal efforts that it looks pretty clean. It has handled twin prime searches pretty well even though it was never tested on Sophies. (I see that Mark has recently fixed the Sophie issue in version 5.5.7.) Here are my percentages: 90% mean prime gods 4% LLR 3% PRPnet 2% hardware from various users 1% sieving software If we hit 100,000 tests without a prime, all bets are off. Perhaps some real investigation may be in order. Last fiddled with by gd_barnes on 20230404 at 21:57 
20230405, 01:35  #68  
"Michael Kwok"
Mar 2006
11×107 Posts 
Quote:
Regarding the sieving for the original n=480K500K range, I think the bulk of it was done via Ken's TPSieve software (https://www.mersenneforum.org/showpo...&postcount=308 ; some sample outputs and very early benchmarks are at https://www.mersenneforum.org/showpo...9&postcount=68). IIRC, NewPGen was used only for a very short time at the very beginning of the sieve, and TwinGen/TwinGenX wasn't used at all. Last fiddled with by MooMoo2 on 20230405 at 01:35 

20230419, 05:10  #69  
Sep 2011
Potsdam, Germany
151 Posts 
Quote:
did you already test the new prprnet server 5.5? Regards Odi 

20230420, 22:45  #70 
"Gary"
May 2007
Overland Park, KS
12,161 Posts 
I have not. Max has updated our 2 private servers to version 5.4.7 and we have been running "normal" tests on it with no problems. I'm not sure if that version has the fix for Sophies in it. I'd rather wait to do an upgrade on a public server until we've done extensive testing on it.

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