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1) Message boards : Number crunching : Tour de Primes 2022 (Message 153551)
Posted 116 days ago by KEPProject donor
How about SR3?


(For those not familiar with SR3, that's a joke. SR3 has an absolutely ridiculous number of k's to be proven. There's over three quarters of a million k's remaining.)


Yes, it is a lot of numbers of k's to be proven, HOWEVER, R3 in itself is "much easier" than R2 to prove. Everytime you double n, about 46% of all k's are removed due to having a prime, so when it comes to prove R3, as insane it may seem, it is still not far fetch.

At n=1M we will have about 15,820 k's remaining (removed about 84,915 k's)
At n=10M we will have about 2,205 k's remaining (removed about 13,615 k's)
At n=100M we will have about 307 k's remaining (removed about 1,898 k's)
At n=1G we will have about 43 k's remaining (removed about 264 k's)
At n=10G we will have about 6 k's remaining (removed about 37 k's)
At n=100G we will have about <0.9 k's remaining (removed about 5 k's)
At n=1T we will have about <0.1 k's remaining (removed about 1 k's)

So with a bit fortune, R3 will prove around n=100G and most likely before n=1T.

Due to the amount of k's that need handling before n=1M, it would make up for a good PSA project. For ages, once level is good enough for BOINC, the project would be interesting for those who want to run small and fast workunits :)

It is definently worth a consideration for Primegrid in near or shortterm future :)

Take care everyone.
2) Message boards : Number crunching : New goals for 2022 and 2021 sum up (Message 153080)
Posted 136 days ago by KEPProject donor
Hebdoprime is close 👍 any day now 😉


Cool, I then stand corrected - I even suspect the project that is overall suspect :)
3) Message boards : Number crunching : New goals for 2022 and 2021 sum up (Message 153056)
Posted 137 days ago by KEPProject donor
I like the idea of a challenge to wipe Proth Prime Search. Such a challenge could be 5 days (if enough work remain for such a period)

Alternatively, a special badge could be designed, to honor the one that crunch the absolute last non certificate Proth Prime Search workunit below 1 million digits - that could in itself indirectly lead to a sort of challenge, and bring Primegrid down by 1 project and indirectly help push Proth Prime Search Extended and the Mega version more than they are today.

I think the Hebdoprime, (10M digit prime) is far to soon, maybe in 2 years time, when ESP and PSP catch up to the >10M digit level - at that time, we even have to wait a couple years before we see the Hebdoprime, but heck lets for fun and game keep the goal, who knows we might get lucky :)
4) Message boards : Number crunching : Once in a Blue Moon Challenge (Message 151097)
Posted 282 days ago by KEPProject donor
Here is some fun numbers, each one can use their own way:

1. We have below n=50M about 355,472 k/n pairs remaining.
2. Everytime we complete 1000 k/n pairs, we increase maximum n with about 71,023
3. Everytime we complete 14,080 k/n pairs, we increase maximum n with about 1,000,000
4. If we complete 3554 k/n pairs each day, we will clear 10% of work remaining by the end of the challenge
5. If we complete 8,885 k/n pairs each day, we will clear 25% of work remaining by the end of the challenge
6. If we find a prime during this challenge, we will save from 22,420 to 104,827 k/n pairs to test, dependant of the weight of the k

Have fun everyone :)
5) Message boards : Number crunching : Once in a Blue Moon Challenge (Message 151076)
Posted 284 days ago by KEPProject donor
You can use pfgw to find the FFT size of any subproject:


Will PFGW always select the same FFT size as LLR/LLR2? /JeppeSN


If the GWnum version of LLR/LLR2 and PFGW is the same, the answer is YES!

However, from time to time, George updates the GWnum library and in the case where you close in on a FFT crossover, then the FFT length can start to vary.

In other words, even if the GWnum version is not the same, then in most of cases, the FFT selected will be the same.
6) Message boards : Number crunching : Once in a Blue Moon Challenge (Message 151053)
Posted 286 days ago by KEPProject donor
Data is in. It is at least 2.48% faster to use 12 cores per test on the Xeon :)

Take care and thanks for your feedback.

See you at the challenge :)
7) Message boards : Number crunching : Once in a Blue Moon Challenge (Message 151043)
Posted 287 days ago by KEPProject donor
Dear guys.

It appears that the suggestion of running 1 task is the most efficient.

Things sure has changed since last I ran Prime Sierpinski Problem tasks.

Just to be sure, I'll do another testing to see if the 30MB L3 cache is exhausted such that I get a memory bottleneck when running 2 tests using 6 cores. If running 1 test at a time using all 12 cores seems to be the most efficient, the Xeon itself will complete approximately 22 firsttime checks during the Once in a Blue Moon challenge :)

I'll get back with my data, once I have a clear comparison. Thanks for all your feedback.

The test that I ran using 12 cores a test, is using FFT=2560K.

Take care.
8) Message boards : Number crunching : Once in a Blue Moon Challenge (Message 151036)
Posted 288 days ago by KEPProject donor
I want to participate in this challenge, the first in about a year. Unfortunantly I have lost track of the thread contatining the information about the current FFT length of each task in each LLR subproject - so can anyone tell me the current minFFT and maxFFT for the Prime Sierpinski Problem?

I'm going to use the information about minFFT and maxFFT to run as most task as possible on the 12 core Xeon. Something tells me that running 2 tasks with 6 cores each may be the best option, but dependant on the FFT size, 3 task using 4 cores each might also be possible :)

A wish could be the very usefull information about the current FFT length are put in a post in an easy to find place, such that no one has to ask this question again later on. It could possibly be in the Number crunching thread :)

Have a nice one everyone :)
9) Message boards : Number crunching : 2021 Challenge Schedule (Message 147051)
Posted 512 days ago by KEPProject donor
@dannyridel and @Skivelitis2

Please look at post: 146747

The SoB challenge is now proposed to be 10 months :)

Take care
10) Message boards : Number crunching : 2021 Challenge Schedule (Message 146788)
Posted 519 days ago by KEPProject donor
Maybe PG could set up a drop on / drop off challenge, where ALL work done on SoB could be counted. Then those really favouring SoB and speaking about a year long challenge, can continue competing with those feeling and favouring SoB a lot, for the entire year, while those needing to do something different from time to time, can drop on / drop off as they suits. If PG incist that there needs to be a SoB challenge and it somehow interfears with the challenge schedule, to have an unofficial 2021 year scoreboard, counting the effort done on SoB over the year, then maybe an unofficial year long drop in / drop off challenge for TRP could be put in its place.


Tour de SoB, all year long, hopefully with a prime!


New proposed schedule:

Jan 2-3: Good Riddance 2020! Challenge: DIV
Jan 5-6: Yuri’s Night Challenge: WW
Jan 8-9: PrimeGrid’s 16th Birthday Challenge: ESP
Jan 11-12: World Emoji Day Challenge: GFN 17-Low
Jan 14-15: Once In a Blue Moon Challenge: PSP
Jan 17-18: Martin Gardner’s Birthday Challenge: GCW
Jan 20-21: Euler’s Constant Challenge: AP27
Jan 23-30: Geminids Shower Challenge: GFN 21, GFN 22, DYFL
Feb 1-28: Tour de Primes
Mar 2 - Dec 31: Tour de SoB


Very great challenge schedule. Sure it is going to be fun to see how much progress this will bring on SoB. Who knows, maybe we will come so close to ending SoB that new sieve and/or new focus projects has to be considered ;)


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