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1) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120509)
Posted 9 days ago by Iain BethuneProject donor
The spreadsheet tells me it should complete with SSE2, but it MaxErr and falls back to x87. It still reaches the correct result, but I figure I should mention it anyway.


Yes, I also observed this with the 32-bit build. If I remember correctly, some transforms have a slightly different implementation (there are some x86_64-specific optimisiations) that also happens to make them more accurate i.e. higher b limit. As a result, the 64-bit test runs fine, and the 32-bit drops back and forward between x87 and the faster transforms. Nothing to worry about.

- Iain
2) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120477)
Posted 11 days ago by Iain BethuneProject donor
I have a Genefer 21 running with 14 threads. And it is using the correct app and currently 42% of my CPU as reported by Windows 10 math.


Thanks, I added it to the google sheet. Thanks for posting the app_info and app_config too!

- Iain
3) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120476)
Posted 11 days ago by Iain BethuneProject donor
Want to help here, downloaded the Winx64 binary. What option do I select? I just double clicked it.


All the win64 tests are now taken care of. However, once you've download the binary you can run it at the command line (example arguments are provided in the google sheet).

- Iain
4) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120463)
Posted 12 days ago by Iain BethuneProject donor

I ran -q "2041898^65536+1" -nt 1 through the 64 bit app in Windows and it said it was probable prime. I wasn't sure if I should put my name in green in that cell or not.


Thanks, 288larsson already did that test, but always good to do a bit more testing!
5) Message boards : Number crunching : Genefer 3.3.4 Testing (Message 120416)
Posted 14 days ago by Iain BethuneProject donor
Hi all,

I've just posted a call for testing of the new genefer 3.3.4 release. Most of the tests are pretty quick, so hopefully we can get many of them done before the Oktoberfest challenge!

Thanks in advance for the help!

- Iain
6) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120399)
Posted 15 days ago by Iain BethuneProject donor
OK, so it's time to do some more extensive testing to prepare for putting the new app into production. I've set up a google sheet here:

https://docs.google.com/spreadsheets/d/1UoLSRjhng9p_rlf64A8xVfa0dCJ8XyEzGrZb5xD9-Ko/edit?usp=sharing

Binaries can be obtained from:

Windows: https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/windows
Mac: https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/mac
Linux: https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/linux

As usual, there are manual tests (run at the command line) and BOINC tests which require setting up an app_info.xml file. In addition, for this release we are testing the new multithreading (enabled by the -nt T flag, where T is the number of threads), which requires an app_config.xml file similarly to LLR. If you need help setting these up, just ask!

The new multithreaded transform only affects 64-bit builds, running the FMA3 or AVX transforms on n=9,13,17,21 - the other tests (including OCL) are only included to check that the builds still work on a range of machines. Detailed testing of the multithreaded code is targeted at n=17 (manual tests) and n=21 (BOINC) 64-bit CPUs.

Please post in the thread if you want to reserve tests, and test results (or links to WUs). Manual credit will be awarded for all completed tests!

Thanks in advance!

- Iain

7) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120335)
Posted 19 days ago by Iain BethuneProject donor
Hi folks,

Watch this space for a proper test campaign, but you can now find a complete set of release-candidate binaries:

https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/windows
https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/mac
https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin/linux

Please do download and have a play with them. I would be interested to see if anyone observes any significant difference between the performance of Yves and my builds (either serial or multi-threaded), as our toolchains as slightly different.

Cheers

- Iain
8) Message boards : Generalized Fermat Prime Search : genefer 3.3.4 (Message 120188)
Posted 27 days ago by Iain BethuneProject donor
I have posted Linux and Mac binaries at https://app.assembla.com/spaces/genefer/subversion/source/HEAD/trunk/bin

I am working on an issue with the Mac related to multithreading, so don't be surprised if it doesn't work. The Linux version should work OK, but I haven't tested as I've only got a single-core VM. If anyone can try it that would be great.

Cheers

- Iain
9) Message boards : AP26 - AP27 Search : Two AP20, FOUND! (Message 119641)
Posted 57 days ago by Iain BethuneProject donor

BTW, how many digits long those primes I found?


They are 16 or 17 digits long. So tiny compared to what we search for, but what makes these primes special is that there are 20 of them with a common difference between each!
10) Message boards : Generalized Fermat Prime Search : GFN Prime Discoveries (Message 119625)
Posted 59 days ago by Iain BethuneProject donor
The list of GFN primes for n=15 and above are now up-to-date with the latest finds. Great progress in the last 6 months:

  • There are now over 1000 known n=15 GFN primes.
  • We found another n=19 prime.
  • The n=20 search has passed b=1000000


Fingers crossed for a find at n=21 or n=22!

- Iain



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