n=1.7M and n=3.322M Twin-Sophie record attempts

[gd_barnes]

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 multi-core, 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 single-core process. Everything matched very well. I was especially happy how well it sieves a wide-range of k along with multiple n vs. NewPGen's single-n process. Of course this is all likely old news to you since I'm guessing you used it for sieving the original n=480K-500K 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.

[MooMoo2]

Originally Posted by gd_barnes

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 multi-core, 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 single-core process. Everything matched very well. I was especially happy how well it sieves a wide-range of k along with multiple n vs. NewPGen's single-n process. Of course this is all likely old news to you since I'm guessing you used it for sieving the original n=480K-500K 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.

Hmmm, interesting ;)

Regarding the sieving for the original n=480K-500K 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.

[odicin]

Originally Posted by gd_barnes

[..] So something is clearly messed up.

At this point, I contacted Mark (rogue) who created everything related to PRPnet. He said he thought there was a bug in the server code and would need to work on it.

My thinking at this point: No one had ever attempted to run a PRPnet server for SGs before -or- there is something in my process messing things up. I'm leaning towards the former but can't say for sure.

I think we don't want to introduce any new code at this point. Let's see if Mark can get the existing code working correctly for SGs. I'll then do some extensive testing on it.

In the mean time, let's make sure we get off on the right foot and stick to having the server run twins. If Mark gets the code fixed and I'm convinced through extensive testing that it works correctly, then we can consider having it run SGs instead since the files are going to be quad sieved.

Hi Gary,

did you already test the new prprnet server 5.5?

Regards Odi

Originally Posted by rogue

I have posted PRPNet 5.5 over at sourceforge. Here are the changes:

[..]
Fixed Sohpie-Germain server support.
[..]

[gd_barnes]

Originally Posted by odicin

Hi Gary,

did you already test the new prprnet server 5.5?

Regards Odi

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.