Posts by James

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1) Message boards : Generalized Fermat Prime Search : cpuGFN21 for Mac? (Message 158019)
Posted 196 days ago by

James

CPU GFN21 for mac will be re-added shortly. Fingers crossed this will make it in time for the December challenge.

Sorry I was wrong. New genefer software is already installed for GFN21 and CPU tasks for GFN21 should be available for mac again

2) Message boards : Generalized Fermat Prime Search : cpuGFN21 for Mac? (Message 158018)
Posted 196 days ago by

James

CPU GFN21 for mac will be re-added shortly. Fingers crossed this will make it in time for the December challenge.

3) Message boards : AP26 - AP27 Search : New APs (Message 151022)
Posted 673 days ago by

James

New AP26!!!

A new AP26 (Arithmetic Progression of 26 primes) has been found. The finder is Tuna Ertemalp (Tuna Ertemalp) of the United States. Tuna Ertemalp is a member of the Microsoft team.

The AP26 was returned on the 31st of July 2021 17:24:38 UTC. It was found by an NVIDIA GeForce RTX 3080 on an Intel(R) Core(TM) i7 CPU 970 @ 3.20GHz Processor running Microsoft Windows 10 Professional x64 Edition. It took about 4 minutes and 27 seconds to process the task (each task tests 100 progression differences of 10 shifts each).

The AP26 task was double checked by Drew Halasz (Lorien) of the United States and was returned on the 2nd of Aug 2021 21:04:09 UTC. This task was run on an CAL Radeon RX 560 Series on an AMD Ryzen 5 1500X Quad-Core Processor Processor running Windows 10 Core x64 Edition. The double check took about 2 hours 29 minutes and 30 seconds to complete.

The progression is written as 260947961525929049+166143654*23#*n for n=0..25. Credits are as follows:

Finder: Tuna Ertemalp
Project: PrimeGrid
Program: AP26

The original AP26 CPU program was written by Jaroslaw Wroblewski and adapted to BOINC by Geoff Reynolds, and the GPU program was written by Bryan Little and Gerrit Slomma.
The 2016 CPU and OpenCL versions of AP26 were updated by Bryan Little, Iain Bethune, and Sebastian Jaworowicz.

All application builds by Bryan Little and Iain Bethune

The AP26 will be listed in Jens Kruse Andersen's Primes in Arithmetic Progression Records page under the section(s):

All known AP24 to AP27

Congratulations!

Additional AP Information
How to search for 26 primes in arithmetic progression? by Jaroslaw Wroblewski
Primes in arithmetic progression - Wikipedia
Prime Arithmetic Progression - Wolfram MathWorld
Arithmetic sequence - The Prime Glossary at the Prime Pages

The 26 terms of the AP26
260947961525929049+166143654*23#*n for n=0..25

23#=2*3*5*7*11*13*17*19*23=223092870

260947961525929049+166143654*223092870*0=260947961525929049
260947961525929049+166143654*223092870*1=298013426129076029
260947961525929049+166143654*223092870*2=335078890732223009
260947961525929049+166143654*223092870*3=372144355335369989
260947961525929049+166143654*223092870*4=409209819938516969
260947961525929049+166143654*223092870*5=446275284541663949
260947961525929049+166143654*223092870*6=483340749144810929
260947961525929049+166143654*223092870*7=520406213747957909
260947961525929049+166143654*223092870*8=557471678351104889
260947961525929049+166143654*223092870*9=594537142954251869
260947961525929049+166143654*223092870*10=631602607557398849
260947961525929049+166143654*223092870*11=668668072160545829
260947961525929049+166143654*223092870*12=705733536763692809
260947961525929049+166143654*223092870*13=742799001366839789
260947961525929049+166143654*223092870*14=779864465969986769
260947961525929049+166143654*223092870*15=816929930573133749
260947961525929049+166143654*223092870*16=853995395176280729
260947961525929049+166143654*223092870*17=891060859779427709
260947961525929049+166143654*223092870*18=928126324382574689
260947961525929049+166143654*223092870*19=965191788985721669
260947961525929049+166143654*223092870*20=1002257253588868649
260947961525929049+166143654*223092870*21=1039322718192015629
260947961525929049+166143654*223092870*22=1076388182795162609
260947961525929049+166143654*223092870*23=1113453647398309589
260947961525929049+166143654*223092870*24=1150519112001456569
260947961525929049+166143654*223092870*25=1187584576604603549

4) Message boards : Problems and Help : Finishing within deadline impossible for new WU, what should I do? (Message 148618)
Posted 845 days ago by

James

However I never encountered a project offering grace periods 4 times longer than original due date minus send date

Now you have! This post describes the deadline extension system at PrimeGrid: https://www.primegrid.com/forum_thread.php?id=6404&nowrap=true#87302

If things haven't changed since then (I don't think they have), the maximum deadline is 4x the original deadline or an additional 30 days, whichever is longer (up to a maximum of 250 days)

5) Message boards : General discussion : Suggestion: Team name in team 'info page' (Message 147669)
Posted 871 days ago by

James

If I have a userId, say 918937, I can build a URL like
http://www.primegrid.com/show_user.php?userid=918937
and get info about such user (user name for one thing, in the header row for the table in the middle of the page: Account information for xxxxxx).

I remember when a very similar change was implemented (adding username to user pages, perhaps because I requested it over on Discord).
I think a team name on the team page would be a nice addition. Let me know what you think (or yell at me if the change breaks anything)

6) Message boards : Number crunching : Good Riddance 2020! Challenge (Message 147501)
Posted 877 days ago by

James

Shiny new hardware is always nice to have :)

Current PPS-DIV FFT size is 480K

7) Message boards : Number crunching : Is turning on hyper threading better if you still assign number of tasks to only pysical cores? (Message 147189)
Posted 890 days ago by

James

These things vary from system to system, from OS to OS, and from subproject to subprojects; only way to know for sure is to try it out for yourself.

That being said, there typically isn't that great of a difference IIRC.

8) Message boards : Generalized Fermat Prime Search : Genefer 3.3.5 testing (Message 146101)
Posted 916 days ago by

James

linux64 SSE2i

I think the times are wrong for 3638450^524288+1 (maybe because it was unexpectedly terminated?)
The result seems fine.

3638450^524288+1

daohe@daohe-XPS-15-9570:~/Documents/genefer335test/s3$ ../gfn3.3.5 -q "3638450^524288+1" -x sse2i genefer 3.3.5.1 (CPU/Linux/64-bit/gcc-7.5.0/BOINC-7.17.0) Copyright 2001-2020, Yves Gallot Copyright 2009, Mark Rodenkirch, David Underbakke Copyright 2010-2012, Shoichiro Yamada, Ken Brazier Copyright 2011-2014, Michael Goetz, Ronald Schneider Copyright 2011-2018, Iain Bethune Genefer is free source code, under the MIT license. Supported transform implementations: fma avx sse4 sse2 fmai avxi sse4i sse2i Command line: ../gfn3.3.5 -q 3638450^524288+1 -x sse2i Low priority change succeeded. Testing 3638450^524288+1... Using sse2i transform Resuming 3638450^524288+1 from a checkpoint (1840338 iterations left) Estimated time remaining for 3638450^524288+1 is 5:02:00 3638450^524288+1 is a probable prime. (3439810 digits) (err = 0.0039) (time = 28:36:32) 20:46:04

11081688^262144+1

daohe@daohe-XPS-15-9570:~/Documents/genefer335test/s2$ ../gfn3.3.5 -q "11081688^262144+1" -x sse2i genefer 3.3.5.1 (CPU/Linux/64-bit/gcc-7.5.0/BOINC-7.17.0) Copyright 2001-2020, Yves Gallot Copyright 2009, Mark Rodenkirch, David Underbakke Copyright 2010-2012, Shoichiro Yamada, Ken Brazier Copyright 2011-2014, Michael Goetz, Ronald Schneider Copyright 2011-2018, Iain Bethune Genefer is free source code, under the MIT license. Supported transform implementations: fma avx sse4 sse2 fmai avxi sse4i sse2i Command line: ../gfn3.3.5 -q 11081688^262144+1 -x sse2i Low priority change succeeded. Testing 11081688^262144+1... Using sse2i transform Starting initialization... Initialization complete (0.565 seconds). Estimated time for 11081688^262144+1 is 11:20:00 11081688^262144+1 is a probable prime. (1846702 digits) (err = 0.0156) (time = 12:47:47) 04:56:53

80146408^131072+1

daohe@daohe-XPS-15-9570:~/Documents/genefer335test/s1$ ../gfn3.3.5 -q "80146408^131072+1" -x sse2i genefer 3.3.5.1 (CPU/Linux/64-bit/gcc-7.5.0/BOINC-7.17.0) Copyright 2001-2020, Yves Gallot Copyright 2009, Mark Rodenkirch, David Underbakke Copyright 2010-2012, Shoichiro Yamada, Ken Brazier Copyright 2011-2014, Michael Goetz, Ronald Schneider Copyright 2011-2018, Iain Bethune Genefer is free source code, under the MIT license. Supported transform implementations: fma avx sse4 sse2 fmai avxi sse4i sse2i Command line: ../gfn3.3.5 -q 80146408^131072+1 -x sse2i Low priority change succeeded. Testing 80146408^131072+1... Using sse2i transform Starting initialization... Initialization complete (0.211 seconds). Estimated time for 80146408^131072+1 is 2:49:00 80146408^131072+1 is a probable prime. (1035978 digits) (err = 0.1875) (time = 3:50:20) 19:58:59

98752904^65536+1

daohe@daohe-XPS-15-9570:~/Documents/genefer335test/s0$ ../gfn3.3.5 -q "98752904^65536+1" -x sse2i genefer 3.3.5.1 (CPU/Linux/64-bit/gcc-7.5.0/BOINC-7.17.0) Copyright 2001-2020, Yves Gallot Copyright 2009, Mark Rodenkirch, David Underbakke Copyright 2010-2012, Shoichiro Yamada, Ken Brazier Copyright 2011-2014, Michael Goetz, Ronald Schneider Copyright 2011-2018, Iain Bethune Genefer is free source code, under the MIT license. Supported transform implementations: fma avx sse4 sse2 fmai avxi sse4i sse2i Command line: ../gfn3.3.5 -q 98752904^65536+1 -x sse2i Low priority change succeeded. Testing 98752904^65536+1... Using sse2i transform Starting initialization... Initialization complete (0.057 seconds). Estimated time for 98752904^65536+1 is 0:37:20 98752904^65536+1 is a probable prime. (523931 digits) (err = 0.1875) (time = 0:57:28) 17:05:26

9) Message boards : Number crunching : Any way to force NOT reporting results immediately? (Message 146033)
Posted 917 days ago by

James

Although I'm not certain this will work, could you try putting in your app_config.xml

<report_results_immediately>0</report_results_immediately>

instead of

<report_results_immediately/>

10) Message boards : Generalized Fermat Prime Search : Genefer 3.3.5 testing (Message 146014)
Posted 918 days ago by

James

sse2i tests will be done soon

I take this back. Something in the kitchen tripped the RCD and the machine I was running the tests on was not on an UPS.

EDIT: ah genefer checkpoints. The tests will be done soon :)

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