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11)
Message boards :
Number crunching :
International Women's Day Challenge
(Message 161029)
Posted 20 days ago by  Michael Goetz
I think there is a minor bug in the challenge stats. If I divide the score by the number of tasks for each participant, I get values between 39.91357038 and 39.91357125, i.e. no difference up to the 6th decimal place. However, as the credit granted for a SGS task resulting in a prime is twice as much as for a normal task, the variation should be much larger. Even for Nick's 311923 tasks, an additional prime task would change the 4th decimal place in the credit per task ratio.
I have to take a look, but I think you're right - it's a small oversight in the challenge leaderboards. I don't think it has the smarts (or the data) to do the adjustment for the when a task is prime.
For an SR5 challenge (which has a similar prime "bonus"), that would rarely affect challenge scores because those primes are so rare. There may be a few other examples, but they'll also be large and rare primes.
Therefore, SGS is the only project where this happens. I'm inclined to treat this as an oversight in the rules rather than an oversight in the code. For the purpose of challenge scores, we don't count the bonus credit you get when you find a prime. This produces an average difference between challenge score and actual credit of approximately 0.0077%, or three quarters of one basis point. That's acceptable to me, and avoids a really nasty and resource intensive revision of the challenge code. That's especially significant for SGS because of the number of tasks that run in a even a short SGS challenge.
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12)
Message boards :
Number crunching :
International Women's Day Challenge
(Message 161012)
Posted 20 days ago by Michael Goetz
Wow!
My two primes so far are the same number of digits how odd.
7779439418187*2^1290000-1 (388342 digits)
7825167726087*2^1290000-1 (388342 digits)
https://www.primegrid.com/workunit.php?wuid=894863310
https://www.primegrid.com/workunit.php?wuid=894077015
I'm not sure if you were joking, or simply weren't aware. but almost all SGS candidates in the sieve file have the exact same number of digits. All SGS candidates tested since sometime in 2015 have 388342 digits. and I suspect all of the remaining candidates in the sieve file also have 388342 digits.
SGS candidates grow VERY slowly.
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13)
Message boards :
Number crunching :
International Women's Day Challenge
(Message 161011)
Posted 20 days ago by Michael Goetz
The task status page says we've hit 1.47 million SGS tasks per day. I severely underestimated then - my prediction of 50 primes was based on a guess that tasks per day would double from the 400K just before the challenge, to about 800K.
At this rate we could be on track for 100 primes during the challenge.
Yes, but that includes time before the challenge started. We're currently on a pace for 2.5 million tasks during the 24 hours of the challenge. However, I expect that number to go up.
The first hour of the challenge had no TSC droplets running. That's 7000+ core hours, Far more important, however, is that people tend to add more power as the challenge progresses.
My guess is we'll break 3 million tasks.
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14)
Message boards :
Number crunching :
International Women's Day Challenge
(Message 160943)
Posted 22 days ago by Michael Goetz
We'll see how it goes. I have an idea for speeding up the leaderboards, but... it's a big change for a problem that has a very short duration.
We have a very fast server called "kraken", which has 4 TB of RAID 1 NVMe memory. If I replicate the database to kraken, and then generate the leaderboards locally on that machine, it should be significantly faster than doing it on the older servers which use SSDs as well as having slower cpus.
It also depends on admin availability.
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15)
Message boards :
Number crunching :
International Women's Day Challenge
(Message 160942)
Posted 22 days ago by Michael Goetz
Will PG servers be able to handle the challenge, or did i overlook an upgrade since last SGS challenge?
I guess we'll see soon enough. :)
The servers actually have a lot more... servers. We've added more systems, but mostly that's to handle the huge resource drain that is required for fast-DC processing. For something like SGS, the system basically has the same capability as it did three years ago when we ran the last SGS challenge. This time, it's only a one day challenge, which makes it easier.
Looking at the forum thread for that challenge, the problem we had was with leaderboard generation taking a long time, and I suspect that will be true this time as well. But as far as processing tasks is concerned, I think we'll be fine. BOINC has a lot of flaws, but it's actually really good at sending and receiving large amounts of tasks. You know, the important stuff. :)
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16)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160916)
Posted 24 days ago by Michael Goetz
Tour de Primes 2023 final results
The winners of the 2023 Tour de Primes jerseys are:
Largest Prime:
 tng 20866766262144+1 (1,918,752 digits)
2nd place: RNDr. MF1 20710506262144+1 (1,917,896 digits)
3rd place: [SG]Darren Li 20543682262144+1 (1,916,975 digits)
Most Primes:
 Scott Brown 100 primes
2nd place: vaughan 52 primes
3rd place: bcavnaugh 18 primes
Largest Cumulative Prime Score:
 Scott Brown 19859.70628125058
2nd place: Trotador 18741.57246179802
3rd place: Darren Li 14545.4450773234
Mountain Stage:
 boss 11 primes
2nd place: Scott Brown 9 primes
3rd place: w a h 7 primes
Total primes found: 743, including a mind-boggling 144 mega primes (an astounding 61 more than last year)!
Total prime score: 380460.71320078 (more than double last year's score)
Congratulations to all the winners!!!
I hope you had as much fun as I did. I hope you all will be back next February for the 2024 Tour de Primes!
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17)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160877)
Posted 27 days ago by Michael Goetz
I show 45 Tasks in progress but all my tasks are competed uploaded and reported.
https://www.primegrid.com/results.php?userid=273570&offset=0&show_names=0&state=1&appid=
Should I just let it go?
Yes.
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18)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160857)
Posted 28 days ago by Michael Goetz
Last time I looked, Scott got to 99 primes, and likely more.
I want to see "I broke it" badge.
Michael, you created the talk too much badge with 10,000 messages.
I reckon now "You broke it!"
Just for TdP.
He's already got his special P100 badge.
Although he did, technically, break it. Initially, it only partly worked,
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19)
Message boards :
Number crunching :
T5k: Race to Remain/Regain (GFN16/PPSE)
(Message 160855)
Posted 29 days ago by Michael Goetz
Since PPSE and GFN-16 probably won't qualify for T5000 in TdP 2024, I have been asking for the past couple months for a new PG sub-project which will find primes in the 600k - 800K range before TdP 2024. I'll leave that up the the mathematicians at PG to figure out what, if anything, makes sense and is feasible.
There isn't anything obvious that we'd want to run in that range, and I'm not inclined to create a project just for this purpose.
If we feel that we want there to be some sub-mega sized projects for TdP, we'll just make the rule arbitrarily include GFN-16 and/or PPSE. There's nothing sacrosanct about T5K that forces us to only use primes that can be included on T5K.
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20)
Message boards :
Number crunching :
Tour de Primes 2023
(Message 160850)
Posted 29 days ago by Michael Goetz
 The Mountain Stage is over and we have a winner!
Congratulations go to boss with an astounding 11 Mountain Stage primes!!!
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