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drummers-lowrise
1) Message boards : Number crunching : 2019 Tour de Primes (Message 126789)
Posted 124 days ago by Profile pschoeferProject donor
Found a second PPSE prime this month. I was wondering what the additional text meant on the find: 6885*2^1521067+1 is a Factor of xGF(1521065,11,5)!!!! (1711.170000 seconds)

Your prime divides the (huge) extended Generalized Fermat number 2^11^1521065+2^5^1521065.

Every Proth prime might be an xGF, GF, or even Fermat number divisor. Last year, only 10 xGF divisors were found (among 497 primes of Proth form), so they are less common than new Top 100 primes nowadays. The most recent GF divisor was found in August 2017, the most recent Fermat number divisor back in February 2015.
2) Message boards : Number crunching : 2019 Tour de Primes (Message 126270)
Posted 132 days ago by Profile pschoeferProject donor
I did check the 2018 TdP leaderboard, and unless I counted wrong, 3 of the 28 days didn't have any GFN prime discoveries.

3 days without any GFN discovery, and another day without a GFN-16 but a GFN-17-Low instead. The rate of PPSE discoveries also varies a lot. Despite the average of 6 PPSE primes per day last year, there was one day with only one PPSE prime:

3) Message boards : AP26 - AP27 Search : Geforce Drivers 4xx.xx Drop more than 2/3 in OpenCL Performance from the 3xx.xx Drivers. (Message 125645)
Posted 138 days ago by Profile pschoeferProject donor
No problems with version 2.04 on my AMD RX 590 + NVIDIA GTX 1070 Ti and AMD R9-280X + NVIDIA GTX 1070 machines. No significant change in run time. The NVIDIA tasks, however, used significantly less CPU time.
4) Message boards : AP26 - AP27 Search : Geforce Drivers 4xx.xx Drop more than 2/3 in OpenCL Performance from the 3xx.xx Drivers. (Message 125525)
Posted 140 days ago by Profile pschoeferProject donor
The new Windows app is working on both my AMD RX 590 + NVIDIA GTX 1070 Ti machine and my AMD R9-280X + NVIDIA GTX 1070 machine (both running Windows 10 x64).

I can also confirm that the performance drop is fixed, run time is the same with 416.34 as with 399.24.
5) Message boards : Proth Prime Search : Multithreading PPSE (Message 125347)
Posted 144 days ago by Profile pschoeferProject donor
I would guess that the gap depends heavily on how many active users there are, because the second task has to be send to a different user. When a large contributer fetches lots of tasks, it may take a while until sufficiently many other users have requested tasks. This effect probably also worked to dthonon's advantage last year.
6) Message boards : Number crunching : 2019 Challenge Voting (Message 123713)
Posted 181 days ago by Profile pschoeferProject donor
Good job. Many different FFT lengths, not too long in total, although I'd like to see at least one of the short task challenges (PPS, AP27, GFN-17-Low) running only for 3 days. Two comments regarding the themes:

1) I'm not sure about the 25th anniversary of discovery of the first extrasolar planets. Wolszczan & Frail reported two planets around a pulsar in January 1992, and the first discovery around a main-sequence star was announced in October 1995 (Mayor & Queloz).

2) While I understand the problem with 'Winter Solstice', there are still two solstices per year. 'December Solstice' would be a neutral, but unambiguous name. :)
7) Message boards : General discussion : Fiddling with the computer because I can't sleep (Message 122858)
Posted 205 days ago by Profile pschoeferProject donor
How did you check the stability? Your computer returned several wrong results (the invalid and, very likely, the inconclusive tasks) last week, so it was not stable before.

Running those long LLR tasks can be even more demanding than a Prime95 torture test (depending on the settings). That is, the latest version of Prime95, not the ancient pre-AVX version that some overclockers are recommending because they only care about stability for games.
8) Message boards : Number crunching : 2019 Challenge Voting (Message 122661)
Posted 210 days ago by Profile pschoeferProject donor
1. SoB - it was already mentioned somewhere that there will very likely be a challenge every year until the DC is finished, so we won't get around that one anyways. :)

2. ESP - Lennart Honary Challenge is great, but a 65 day challenge would only be special in the sense that it would become especially boring long before it is finished. How about one challenge of two times 6.5 days with a break in between (could be a 52 days break so that it is still 65 days from start of part 1 to end of part 2)?

3. TRP - there should be a third "conjecture challenge" and it should be shorter than 10 days if we already have SoB and ESP challenges in the 10+ days range, so TRP is the more reasonable choice than PSP.

4. GCW - we had both CUL and WOO this year, let's do the combination of their generalized forms next year (ignoring the fact that it is actually GC only ;)).

5. PPSE - we had MEGA in 2016 and plain PPS challenges every other year, but no PPSE since 2010. Ideally suited for a sprint of 1 or 2 days.

6. GFN - we had the short ones (15-17) last year and a long one (21) this year, so it's time for something in between again (18, 19, or both).

7. AP27 - another GPU project for the traditional Winter Solstice challenge and AP27 is more interesting than PPS Sieve.

There is a Conjunction of Venus and Jupiter on November 24th next year, so there could be a 5 day challenge (GCW or medium-sized GFN) from Nov 24 to Nov 29 with that theme which did not fit this year.
9) Message boards : Problems and Help : Team Country change (Message 122457)
Posted 215 days ago by Profile pschoeferProject donor
Not sure if PrimeGrid imports the BOINC-wide team database, but Storm exists in that database with country set to Ireland. Maybe that's the right place to change it.
10) Message boards : Number crunching : New PrimeGrid Policy - Monetization of BOINC credit (Message 121868)
Posted 225 days ago by Profile pschoeferProject donor
I totally agree with everything written in this thread so far.


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