Welcome to International Women's Day Challenge

The second challenge of the 2023 Series will be on International Women's Day, a global holiday celebrated annually on March 8 as a focal point in the women's rights movement, bringing attention to issues such as gender equality, reproductive rights, and violence and abuse against women.

The challenge will be 1-day in duration and offered on the SGS-LLR application, beginning 08 March 15:00 UTC and ending 09 March 15:00 UTC.

To participate in the challenge:

• Wait until the challenge timeframe starts (or set your BOINC Client download schedule accordingly), as tasks issued before the challenge will not count.
  
• In your PrimeGrid preferences section, select only the Sophie Germain Prime Search (LLR) project.
  

Important reminders:

• NOTE: If the candidate being tested is indeed prime, the task will take TWICE as long to complete. This is because LLR is automatically checking for a twin prime!
  
• The typical deadline for some of these WUs is longer than the challenge time-frame, so make sure your computer is able to return the WUs within 1 days. Only tasks issued AFTER the start time and returned BEFORE the finish time will be counted.
  
• At the Conclusion of the Challenge: We kindly ask users "moving on" to ABORT their tasks instead of DETACHING, RESETTING, or PAUSING. ABORTING tasks allows them to be recycled immediately; thus a much faster "clean up" to the end of a Challenge. DETACHING, RESETTING, and PAUSING tasks causes them to remain in limbo until they EXPIRE. Therefore, we must wait until tasks expire to send them out to be completed. Please consider either completing what's in the queue or ABORTING them. Thanks!

Let's talk about hardware:

Supported platforms for LLR tasks:


• Windows: 32 bit, 64 bit
  
• Linux: 32 bit, 64 bit
  
• Mac: 64 bit


Intel and recent AMD CPUs with FMA3 capabilities (Haswell or better for Intel, Zen-2 or better for AMD) will have a very large advantage running LLR tasks, and CPUs with AVX-512 capabilities (certain recent Intel Skylake-X and Xeon CPUs, AMD Ryzen 7000 and EPYC CPUs) will be the fastest.

Note that LLR is running the latest AVX-512 version of LLR which takes full advantage of the features of these newer CPUs. It's faster than the previous LLR app and draws more power and produces more heat, especially if they're highly overclocked. If you have certain recent Intel Skylake-X, Xeon, or AMD Zen-4+ CPUs, especially if it's overclocked or has overclocked memory, and haven't run the new AVX-512 LLR before, we strongly suggest running it before the challenge while you are monitoring the temperatures.

As with all number crunching, excessive heat can potentially cause permanent hardware failure. Please ensure your cooling system is sufficient. Please see this post for more details on how you can "stress test" your CPU.

Additional information:

Time zone converter:

The World Clock - Time Zone Converter

NOTE: The countdown clock on the front page uses the host computer time. Therefore, if your computer time is off, so will the countdown clock. For precise timing, use the UTC Time in the data section at the very top, above the countdown clock.

Scoring Information

Scores will be kept for individuals and teams. Only tasks issued AFTER 08 March 15:00 UTC and received BEFORE 09 March 15:00 UTC will be considered for credit. We will be using the same scoring method as we currently use for BOINC credits. A quorum of 2 is NOT needed to award Challenge score - i.e. no double checker. Therefore, each returned result will earn a Challenge score. Please note that if the result is eventually declared invalid, the score will be removed.

About the Sophie Germain Prime Search

A prime number p is called a Sophie Germain prime if 2p + 1 is also prime. For example, 5 is a Sophie Germain prime because it is prime and 2 × 5 + 1 = 11, is also prime. These numbers are named after Marie-Sophie Germain, an extraordinary "French mathematician who made important contributions to the fields of differential geometry and number theory and to the study of Fermat's Last Theorem." (Wiki)

We'll be searching the form k*2^n-1. If it is prime, then we'll check k*2^n+1, k*2^(n-1)-1, & k*2^(n+1)-1. The opportunity to find SG's and Twins in the same subproject is appealing.

For more information about Sophie Germain primes, please visit these links:
http://primes.utm.edu/glossary/page.php?sort=SophieGermainPrime
http://mathworld.wolfram.com/SophieGermainPrime.html
http://en.wikipedia.org/wiki/Sophie_Germain_prime

For more information about Marie-Sophie Germain, please visit these links:
http://en.wikipedia.org/wiki/Sophie_Germain
http://www.pbs.org/wgbh/nova/proof/germain.html

What is LLR?

The Lucas-Lehmer-Riesel (LLR) test is a primality test for numbers of the form N = k*2^n − 1, with 2^n > k. Also, LLR is a program developed by Jean Penne that can run the LLR-tests. It includes the Proth test to perform +1 tests and PRP to test non base 2 numbers. See also:

• Lucas-Lehmer-Riesel test (WIKI)
  
• Download LLR by Jean Penné
  

____________

Time flies like an arrow. Fruit flies like a banana.

Will PG servers be able to handle the challenge, or did i overlook an upgrade since last SGS challenge?

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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My lucky number is 75898⁵²⁴²⁸⁸+1

Hi, settings for the SGS says multithreading is available but is not recommended. Should we use multithreading at all or do you suggest to limit 1 task per thread? Thanks

37

Recent primes found in the SGS project (these are not Sophie Germain primes) can be seen here:
/primes/primes.php?project=SGS&sortby=date&dc=yes

Does anyone want to give a bet how many such primes we can find in the 24 h challenge window? (Pick some rule for which primes to include, like the task of the 1st-finder should count for the challenge.)

/JeppeSN

49

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.
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1 PPSE (+2 DC) & 5 SGS primes

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 don't get this either - it seems to be what happens

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.

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 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.
____________

Well, in my results I see:
39.91 credit for regular SGS tasks
79.83 credit for SGS prime tasks.

Challenge: 862 053.31 credit and 21 598 tasks.
21596 * 39.91 = 861896,36
2 * 79.83 = 159,66
Total 862056.02
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My stats

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.

If we sustain the SGS challenge rate, how many days would remain before exhausting the sieve file?

If we sustain the SGS challenge rate, how many days would remain before exhausting the sieve file?

What a whirlwind! The challenge is over, cleanup tasks are now available, and here are the workunit statistics so far!

Challenge: International Women's Day
App: 2 (SGS)
(As of 2023-03-10 05:37:07 UTC)

2845790 tasks have been sent out. [CPU/GPU/anonymous_platform: 2845790 (100%) / 0 (0%) / 0 (0%)]

Of those tasks that have been sent out:

26770 (1%) were aborted. [26770 (1%) / 0 (0%) / 0 (0%)]
2956 (0%) came back with some kind of an error. [2956 (0%) / 0 (0%) / 0 (0%)]
2658042 (93%) have returned a successful result. [2658042 (93%) / 0 (0%) / 0 (0%)]
51556 (2%) are still in progress. [51542 (2%) / 0 (0%) / 0 (0%)]

Of the tasks that have been returned successfully:

48881 (2%) are pending validation. [48867 (2%) / 0 (0%) / 0 (0%)]
2607962 (98%) have been successfully validated. [2607976 (98%) / 0 (0%) / 0 (0%)]
1211 (0%) were invalid. [1211 (0%) / 0 (0%) / 0 (0%)]
25 (0%) are inconclusive. [25 (0%) / 0 (0%) / 0 (0%)]

The current leading edge (i.e., latest work unit for which work has actually been sent out to a host) is k=7903885457895. The leading edge was at k=7790339316147 at the beginning of the challenge. Since the challenge started, the leading edge has advanced 1.46% as much as it had prior to the challenge!
____________

Time flies like an arrow. Fruit flies like a banana.

Cleanup Status:

Mar 11: 32075 tasks outstanding; 7217 affecting individual (133) scoring positions; 748 affecting team (7) scoring positions.
Mar 12: 23229 tasks outstanding; 2924 affecting individual (94) scoring positions; 150 affecting team (4) scoring positions.
Mar 13: 22121 tasks outstanding; 2751 affecting individual (91) scoring positions; 145 affecting team (4) scoring positions.
Mar 14: 15636 tasks outstanding; 1396 affecting individual (66) scoring positions; 64 affecting team (3) scoring positions.
Mar 15: 1620 tasks outstanding; 29 affecting individual (7) scoring positions; 1 affecting team (1) scoring positions.
Mar 16: 584 tasks outstanding; 9 affecting individual (3) scoring positions; 0 affecting team (0) scoring positions.
____________

Time flies like an arrow. Fruit flies like a banana.

And the challenge results are final!

Congrats to Nick and TeAm AnandTech for winning the individual and team competitions, respectively!

Next up is the 7 day Gotthold Eisenstein's Birthday Challenge on the PSP project, starting on April 16th at 16:00:00 UTC.

Hope you all had as much fun during this crazy one day challenge as we did!
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My lucky number is 75898⁵²⁴²⁸⁸+1

The results are final!
During the 1 day challenge, we completed 2656836 tasks (including doublechecks).

118 teams and 509 individuals participated in the challenge.

Top Three Individuals:
1. Nick with 311,923 tasks completed
2. [TA]Skillz with 237,638 tasks completed
3. Scott Brown with 113,721 tasks completed

Top Three Teams:
1. TeAm AnandTech with 481,956 tasks completed
2. BOINC@AUSTRALIA with 367,811 tasks completed
3. SETI.Germany with 231,295 tasks completed
____________

Time flies like an arrow. Fruit flies like a banana.

By the way, how many primes were found during the challenge? Sorry if I missed this info.

You had no completed any SGS tasks during challenge, sorry.
Please, re-read the first post, mainly "To participate in the challenge" part
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My stats