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drummers-lowrise
1) Message boards : AP26 - AP27 Search : sporadic crashes on AMD GPUs (access violation) (Message 133107)
Posted 23 days ago by Profile pschoeferProject donor
For the ongoing challenge, I also threw my AMD GPUs at AP27. While they finish most tasks slowly but reliably, every GPU had at least one task crashing after a few seconds with error code -1073741819 (0xC0000005) STATUS_ACCESS_VIOLATION. A few examples:

1025750645 (RX 590)
1025834999 (RX 580)
1025739021 (R9-280X)
1025941747 (another R9-280X)

This should rule out a hardware problem, but all machines are using the same version of the driver software (19.8.1 on Win10 1903), so I can't tell if the problem is in that specific driver or the AP27 app itself.

Is anyone else seeing those crashes on their AMD GPUs?
2) Message boards : Fermat Divisor Search : Fermat Divisor Search (Message 132630)
Posted 38 days ago by Profile pschoeferProject donor
Second phase is searching 5<=k<=49 up to 9M. This part will take longer.

Does that include k=27? If so, are we doublechecking the results of the ongoing PRPNet effort or just skipping to n>7.5M for that k?
3) Message boards : Generalized Fermat Prime Search : DO YOU FEEL LUCKY? (Message 131666)
Posted 74 days ago by Profile pschoeferProject donor
an " Option " … which is aplied … in MilkyWay@Home and in GpuGrid … maximum CPU for Graphics

That's a very old BOINC standard setting that you will find at all projects without a customized settings page. It is a screensaver setting (i.e., graphics output) and has nothing to do with GPU applications.
4) Message boards : Number crunching : 50th Anniversary of the Moon Landing Challenge (Message 131290)
Posted 87 days ago by Profile pschoeferProject donor
Is "13 primes have been found so far!" normal for this Event or do we see more most of the time?
"1 xGFN divisor!" I think this was me.
Now I know what that is...Divides xGF(2750266,7,4)
T5K, https://primes.utm.edu/primes/page.php?id=126656
701*2^2750267+1 is a Factor of xGF(2750266,7,4)!!!! (10616.880000 seconds)


It's been a long time since we've run a PPS challenge. What I can say is participation is very high, and we're crunching a whole lot of tasks. We had been doing about 16K tasks per day before the challenge, and now we're doing close to 200K per day.

Last year's Solar Eclipse Challenge was at PPS-LLR. Back then, ~145k tasks per day were completed successfully and 9 primes were found in 3 days. So we're doing ~35% more (and slightly longer) tasks this time and might also end up with more primes per day.
5) Message boards : Number crunching : 2019 Tour de Primes (Message 126789)
Posted 244 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.
6) Message boards : Number crunching : 2019 Tour de Primes (Message 126270)
Posted 252 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:

7) 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 258 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.
8) 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 260 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.
9) Message boards : Proth Prime Search : Multithreading PPSE (Message 125347)
Posted 264 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.
10) Message boards : Number crunching : 2019 Challenge Voting (Message 123713)
Posted 301 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. :)


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