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Message boards : Project Staging Area : 2017 PRPNet May-June Challenge

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Roger
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Message 108109 - Posted: 24 May 2017 | 12:34:53 UTC

Cube Challenge 3^3 - 27th May till 3rd June 2017

Announced is a challenge at the 27 prime search project from the 27th May till 3rd of June to celebrate cubes and the number 27 in particular.
We will start at 12:00 UTC and finish at 12:00 UTC one week later.

In geometry, a cube is a three-dimensional solid object bounded by six square faces, facets or sides, with three meeting at each vertex.
The cube is the only regular hexahedron and is one of the five Platonic solids. It has 6 faces, 12 edges, and 8 vertices.

In arithmetic and algebra, the cube of a number n is its third power: the result of the number multiplied by itself twice:
n^3 = n Ã— n Ã— n.
It is also the number multiplied by its square:
n^3 = n Ã— n^2.

A cube number, or a perfect cube, or sometimes just a cube, is a number which is the cube of an integer. The perfect cubes up to 60^3 are (sequence A000578 in the OEIS). Subject of our challenge, 27, is the 4th number in this sequence.

Determination of the cubes of large numbers was very common in many ancient civilizations. Mesopotamian mathematicians created cuneiform tablets with tables for calculating cubes and cube roots by the Old Babylonian period (20th to 16th centuries BC).Cubic equations were known to the ancient Greek mathematician Diophantus.Hero of Alexandria devised a method for calculating cube roots in the 1st century CE. Methods for solving cubic equations and extracting cube roots appear in The Nine Chapters on the Mathematical Art, a Chinese mathematical text compiled around the 2nd century BCE and commented on by Liu Hui in the 3rd century CE. The Indian mathematician Aryabhata wrote an explanation of cubes in his work Aryabhatiya. In 2010 Alberto Zanoni found a new algorithm to compute the cube of a long integer in a certain range, faster than squaring-and-multiplying.

More about the 27121 prime search can be found here. News and infos about the PRPNet client can be found here.

To take part, you have to activate the following lines in prpclient.ini:

server=27:100:1:prpnet.primegrid.com:12006

Remember you also need to run the "install", "update" and "start" batch file for the appropriate number of cores on your PC. Give it a go before the challenge to iron out any problems. Multithreading is also now available for LLR.

Stats will be available 15 minutes after the start at the well known place here.

All previous PRPNet challenge stats can be found here.

Good luck!
____________

Roger
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Message 108156 - Posted: 27 May 2017 | 14:16:57 UTC

The Challenge has begun.
Grebuloner and The_Knights_Who_Say_Ni! have the early lead.

Michael Goetz
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Message 108159 - Posted: 27 May 2017 | 18:31:06 UTC

I'm in! Took a bit of playing around, but I got multithreading to work using the batch file hack (Thanks, Roger.) Tasks are taking about 50 minutes on my Haswell with 4 of 4 cores.
____________
My lucky number is 75898524288+1

bcavnaugh

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Message 108173 - Posted: 28 May 2017 | 16:46:07 UTC

For New Users and Members we could use directions how to set this all up being that it is not a BOINC Project.
Thanks
____________

Crunching@EVGA The Number One Team in the BOINC Community. Folding@EVGA The Number One Team in the Folding@Home Community.

XAVER

Joined: 21 Jun 16
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Message 108174 - Posted: 28 May 2017 | 17:13:36 UTC

Instructions for setting up PRPNet can be found under : Message boards: PRPNet

XAVER

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Message 108175 - Posted: 28 May 2017 | 17:16:12 UTC
Last modified: 28 May 2017 | 17:19:48 UTC

Instructions for setting up PRPNet can be found under : Message boards: Project Staging Area: PRPNet

Sorry, forgot the message board name

GDB

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Message 108179 - Posted: 28 May 2017 | 18:49:11 UTC - in response to Message 108159.

I'm in! Took a bit of playing around, but I got multithreading to work using the batch file hack (Thanks, Roger.) Tasks are taking about 50 minutes on my Haswell with 4 of 4 cores.

Where is info for doing this?

bcavnaugh

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Message 108181 - Posted: 28 May 2017 | 19:06:26 UTC - in response to Message 108175.
Last modified: 28 May 2017 | 19:07:28 UTC

Instructions for setting up PRPNet can be found under : Message boards: Project Staging Area: PRPNet

Sorry, forgot the message board name

Thanks, A Link would have helped.
Here is where I think you are saying.
____________

Crunching@EVGA The Number One Team in the BOINC Community. Folding@EVGA The Number One Team in the Folding@Home Community.

Michael Goetz
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Message 108183 - Posted: 28 May 2017 | 19:37:43 UTC - in response to Message 108179.

I'm in! Took a bit of playing around, but I got multithreading to work using the batch file hack (Thanks, Roger.) Tasks are taking about 50 minutes on my Haswell with 4 of 4 cores.

Where is info for doing this?

____________
My lucky number is 75898524288+1

kashi

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Message 108214 - Posted: 30 May 2017 | 16:42:35 UTC

Couldn't get multithreading to work, so just ran some single core clients instead.

A few hours ago was checking one of my clients and it flashed up highlighted that it had found a prime but when I go to http://prpnet.primegrid.com:12006/user_primes.html page it says it is "hidden".

How do I unhide it please?

Done mostly Sieve on PrimeGrid BOINC and PSA subprojects so the only other primes I found were in 2010. I'm pleased to find another one.

JimB
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Message 108215 - Posted: 30 May 2017 | 18:47:02 UTC - in response to Message 108214.

Couldn't get multithreading to work, so just ran some single core clients instead.

A few hours ago was checking one of my clients and it flashed up highlighted that it had found a prime but when I go to http://prpnet.primegrid.com:12006/user_primes.html page it says it is "hidden".

How do I unhide it please?

I have to doublecheck it and report it to the Top 5000 primes site (it's a megaprime - over one million digits). It will then be unhidden on PRPNet. Later it'll show up in your primes list here after it's manually added. Give it a few hours.

JeppeSN

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Message 108216 - Posted: 30 May 2017 | 19:49:54 UTC - in response to Message 108214.

A few hours ago was checking one of my clients and it flashed up highlighted that it had found a prime but when I go to http://prpnet.primegrid.com:12006/user_primes.html page it says it is "hidden".

How do I unhide it please?

WAUW, if this turns out to pass the double check, it is a huge find that seems to go into a 44th position on the Top 5000 list of greatest known primes (Caldwell). Exciting. /JeppeSN

JimB
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Message 108220 - Posted: 30 May 2017 | 23:36:48 UTC
Last modified: 30 May 2017 | 23:54:55 UTC

That candidate is not prime. Mike and I got matching results:

Mine:
cllr64 -d -t4 -q"27*2^6560020-1"
Starting Lucas Lehmer Riesel prime test of 27*2^6560020-1
Using AVX FFT length 384K, Pass1=384, Pass2=1K, 4 threads
V1 = 5 ; Computing U0...done.
27*2^6560020-1 is not prime. LLR Res64: 94216F6B9DFBB58B Time : 3816.986 sec.

Mike's:
27*2^6560020-1 is not prime. LLR Res64: 94216F6B9DFBB58B Time : 2939.457 sec.

Any "prime" where c == -1 is always suspicious. The algorithm used by the LLR program returns a prime result if there are hardware problems. When c == 1 and there are errors the residue shows as 0000000000000001. For that reason, our BOINC validator requires three matching results to believe 0000000000000001 and even then it'll email me so that I can test manually. There are 13 false primes with c == -1 in the BOINC system at the moment.

I'll fix the results and remove the "prime" record. I think I have a program to do it all for me - it involves changing a half dozen tables.

kashi

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Message 108222 - Posted: 31 May 2017 | 0:39:06 UTC - in response to Message 108220.
Last modified: 31 May 2017 | 0:45:18 UTC

Ah shucks, would have been my first prime as finder, found a list which indicated my other 2 from 2010 were as checker. Well I better keep looking for one then, but perhaps not with PRPNet. Thanks for checking it for me and replying.

Wonder what what would cause such hardware errors? Haven't noticed any stop errors in client windows or errors on any other BOINC projects. Computer is not overclocked and I recently fitted new memory, replacing some faulty 3,200 MHz rated memory that started giving errors on many different BOINC projects including an earlier PRPNet Challenge.

New RAM is on motherboard QVL list and running at default 2,133Mhz speed with relaxed timings as it refuses to run at its rated 2,666 MHz speed and tight timings. It's called HyperX Savage, looks like it's a bit too savage for PRPNet. Getting any memory to run at its rated speed and timings has proved impossible on this Skylake CPU.

Why I'm asking, is if this computer is giving errors on PRPNet but not on other BOINC projects then it would be better to avoid PRPNet on this computer and only use my other one for PRPNet. Funny thing is my other computer was giving a few errors when running multithreaded tasks in the recent Challenge on PSP. And that computer uses registered memory.

Michael Goetz
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Message 108224 - Posted: 31 May 2017 | 1:49:08 UTC - in response to Message 108222.

LLR is based on the same code as Prime95, and Prime95 is used as a stress test by overclockers because it pushes the CPU so hard. The apps here are significantly tougher than most programs. If there's any instability at all in your system, it will show up here.

If you just put in new memory, my guess would be that's where the problem is.
____________
My lucky number is 75898524288+1

kashi

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Message 108230 - Posted: 31 May 2017 | 4:16:16 UTC - in response to Message 108224.
Last modified: 31 May 2017 | 4:30:58 UTC

Thank you for the explanation.

By "recently" for replacement new memory I meant a few months ago. Same computer with new memory installed completed oodles of BOINC multithreaded PSP LLR tasks without any errors running non stop for 15 days in the recent Mathematics Awareness Month Challenge. It did have H/T disabled then however and was running single PSP LLR tasks multithreaded on 3 cores.

For this PRPNet Challenge, H/T was enabled and ran only 2 PRPNet clients without multithreading, another 2 cores were running POGS in a VMware MacOS virtual machine and another core was allocated to supporting Einstein@Home GPU processing in Windows BOINC. Perhaps the combination was too much for PRPNet to handle, although only 5 cores out of 8 were loaded and the computer was not running hot at all. Or maybe PRPNet just don't take kindly to hyperthreading.

Can't continue running PRPNet on this computer now that it has proved to give errors. With no stop errors shown and no wingman check like in BOINC there is no way for me to to tell if all PRPNet tasks on this computer are processing incorrectly.

Plus my other computer has started having repeated delays today connecting to server to download new tasks "connect to socket failed with error 10060" so looks like something may be awry with PRPNet on that computer too. So I've now stopped PRPNet on that one also.

Have enjoyed participating in a few PRPNet Challenges and thank everyone concerned with running them.

Roger
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Message 108263 - Posted: 1 Jun 2017 | 10:19:57 UTC

WU's completed so far:
27th May 375 (only some of these counted for the challenge)
28th May 691
29th May 883
30th May 1,002
31st May 1,032
A steady increase to be sure.
Leading edge of the search has increased from 6,525,272 to 6,587,564 on both the plus and minus sides. Goal is to get to 6.6M.

Roger
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Message 108319 - Posted: 3 Jun 2017 | 12:13:01 UTC

The Challenge has ended. Congratulation to Grebuloner and The_Knights_Who_Say_Ni!

The top of the challenge rankings is as follows:

top users 1 Grebuloner 47,482,149 2 Williamd007 18,634,980 3 bcavnaugh 17,396,095 4 Lumiukko 17,091,310 5 Nortech 14,542,347 top teams 1 The_Knights_Who_Say_Ni! 66,117,129 2 Crunching@EVGA 29,828,147 3 Aggie_The_Pew 24,765,670 4 PrimeSearchTeam 17,091,311 5 SETI.Germany 11,386,451

Collectively 6,724 WUs were done by 52 competitors from 22 Teams and the leading edge advanced from 6,525,272 to past 6,618,365 on both the plus and minus sides.

Well done to everyone who participated. See you in the September, Factorial Prime Search Challenge!
____________

Opolis

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Message 108337 - Posted: 3 Jun 2017 | 22:28:31 UTC

Congrats to 1st places!
This event got me into PRPNet for the first time and it was fun.

Go crunching@evga!

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Message 108379 - Posted: 5 Jun 2017 | 17:14:12 UTC

permanent link to the stats: http://u-g-f.de/PRPNet/2017_06_27_Challenge.html
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