Message boards : Sieving : GFN Optimal Sieving Levels

Author Message
JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 102751 - Posted: 27 Dec 2016 | 10:16:19 UTC

I created a spreadsheet to calculate the optimal sieving level for each GFN n based on how many candidates we're projected to test over the next five years. I have good data on what b level started testing when and comparing that to the current leading edge gives a good approximation of how many candidates we'll test in the future.

As of 2016-12-27:

n Current Optimal Percentage Level Level Done 15 26000P 10300P 252% 16 8582P 65500P 13.1% 17 29161P 157900P 18.5% 18 20130P 61300P 32.8% 19 19214P 77700P 24.7% 20 37540P 79400P 47.3% 21 87000P 146400P 59.4% 22 172171P 154900P 111%

The immediate takeaway is that we're oversieved on n=15 and n=22. Sieving for n=15 is already stopping at p=26000P while n=22 is now set to stop at p=173000P. Optimal sieving for n=17 is much higher because with two b ranges being tested, much more of sieving is useful to eliminate candidates.

Sieving priorities are n=20 and n=21. They take the longest to test with genefer but are the fastest to sieve. Next would be n=18 and n=19 because the percentage of optimal is so low. n=16 and n=17 come last: while they have a long way to get to optimal, testing those candidates with genefer is pretty fast. When any n hits the optimal level, we'll suspend it so the other n's get more work.

Feel free to sieve any open n, the above is for those people who are asking which n to prioritize.

xXUnRealXx

Joined: 24 Nov 15
Posts: 1
ID: 429478
Credit: 2,251,943,153
RAC: 2

Message 102792 - Posted: 29 Dec 2016 | 2:21:33 UTC - in response to Message 102751.

Happy Holiday's

klepel

Joined: 29 Nov 10
Posts: 33
ID: 74910
Credit: 497,119,937
RAC: 0

Message 104062 - Posted: 24 Jan 2017 | 0:31:44 UTC

Am I correct?
We are approaching fast the sieving limit of n21:
n21 87000P 146400P 59.42622951% (Posted: 27 Dec 2016
n21 143767P 146400P 98.20150273% (23 Jan 2017)
Will n21 sieve end at the end of January 2017?

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 104075 - Posted: 24 Jan 2017 | 11:27:19 UTC - in response to Message 104062.

Yes, you are correct. We've had three or four users who seem to be competing to see how much sieving they can do on n=21. As the optimal point is already programmed into the system, it will stop accepting reservations when optimal is hit (and will limit the size of reservations before that so as not to go past optimal). I don't anticipate recalculating the optimal levels until some of the other n's have been sieved a lot further.

All of the sieving status tables now show the optimal sieving level at the bottom and in the case of the graphs they end there. The unreserved portion of n=21 is about half the width of my screen on the graph now.

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 108047 - Posted: 21 May 2017 | 15:37:30 UTC

I've recomputed optimal sieving levels for all GFN n values. GFN20, 21 and 22 are now reopened with new higher optimal sieving levels based on how much work we've done, time to test with the most recent Genefer and time to sieve.

Michael Millerick
Volunteer tester

Joined: 4 Feb 09
Posts: 938
ID: 35074
Credit: 901,959,834
RAC: 1,345,203

Message 111048 - Posted: 30 Oct 2017 | 2:17:53 UTC

It looks like n=16 crossed 65500P but is still issuing new work.
____________

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 111051 - Posted: 30 Oct 2017 | 7:11:17 UTC - in response to Message 111048.

It looks like n=16 crossed 65500P but is still issuing new work.

It'll stop at p=66000P (I like to stop at multiples of 1000P for sieving this high).

Dave

Joined: 13 Feb 12
Posts: 3204
ID: 130544
Credit: 2,283,569,067
RAC: 979,091

Message 111055 - Posted: 30 Oct 2017 | 11:35:38 UTC

Bingowings.

vaughan

Joined: 11 Aug 05
Posts: 336
ID: 224
Credit: 11,521,678,721
RAC: 27,089,998

Message 111081 - Posted: 1 Nov 2017 | 2:19:02 UTC

Why did GFN16 sieving stop?

Rafael
Volunteer tester

Joined: 22 Oct 14
Posts: 911
ID: 370496
Credit: 548,293,027
RAC: 432,011

Message 111082 - Posted: 1 Nov 2017 | 2:33:26 UTC - in response to Message 111081.

Why did GFN16 sieving stop?

It has hit optimal depth already. Or rather, there are more important things to sieve right now.

vaughan

Joined: 11 Aug 05
Posts: 336
ID: 224
Credit: 11,521,678,721
RAC: 27,089,998

Message 111083 - Posted: 1 Nov 2017 | 2:47:10 UTC - in response to Message 111082.

OK so does that mean the next one, GFN17 is the priority? It is next shown in the list.

Rafael
Volunteer tester

Joined: 22 Oct 14
Posts: 911
ID: 370496
Credit: 548,293,027
RAC: 432,011

Message 111084 - Posted: 1 Nov 2017 | 2:55:51 UTC - in response to Message 111083.

OK so does that mean the next one, GFN17 is the priority? It is next shown in the list.

n=17 always was the priority, the list just shows stuff from lowest n to highest.

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 111085 - Posted: 1 Nov 2017 | 3:41:31 UTC

Every six months I reevaluate the sieving levels, GFN16 will almost certainly reopen at that time. GFN19, GFN20 and GFN22 certainly will. For purposes of the computation, I look at what we'll check with genefer over the next five years. I think that makes a lot of sense, especially now that we have to appeal to users for money to keep the servers hosted.

GDB

Joined: 15 Nov 11
Posts: 298
ID: 119185
Credit: 4,052,581,703
RAC: 1,879,596

Message 114989 - Posted: 15 Feb 2018 | 6:18:50 UTC

Sieving stats 02/15/18

n
22 58.4% entries sieved out
21 61.4
20 64.5
19 68.0
18 68.1

Timbuk2

Joined: 19 Jan 12
Posts: 1
ID: 127594
Credit: 23,491,525
RAC: 0

Message 116912 - Posted: 7 Apr 2018 | 9:52:08 UTC

It seems like GFN n=22 isnâ€˜t accepting any new reservations. Did we achieve optimal sieving depth?

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 116918 - Posted: 7 Apr 2018 | 16:46:45 UTC - in response to Message 116912.

It seems like GFN n=22 isnâ€˜t accepting any new reservations. Did we achieve optimal sieving depth?

Look two posts before yours.

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 129368 - Posted: 12 May 2019 | 10:11:26 UTC - in response to Message 114989.

Sieving stats 02/15/18

n
22 58.4% entries sieved out
21 61.4
20 64.5
19 68.0
18 68.1

all GFNs seem to be out
____________
My lucky number is 6219*2^3374198+1

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 129391 - Posted: 12 May 2019 | 17:12:13 UTC

GFNs are not 'out". Twice a year I calculate what siving we need to run to be optimal for the next five years' worth of genefer work. If GFN19 and GAFN22 run out before June 30th, I'll simply do my calculations early.

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 129460 - Posted: 14 May 2019 | 11:53:40 UTC - in response to Message 129391.

so new work will come out before 6.30?
____________
My lucky number is 6219*2^3374198+1

dthonon
Volunteer tester

Joined: 6 Dec 17
Posts: 435
ID: 957147
Credit: 1,748,562,214
RAC: 370,038

Message 129471 - Posted: 14 May 2019 | 14:45:02 UTC - in response to Message 129460.

so new work will come out before 6.30?

GFN19 and GFN22 are open for reservation.

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 129880 - Posted: 27 May 2019 | 10:47:29 UTC - in response to Message 129471.

Will the sieve credit be counted in the GFN subproject?
____________
My lucky number is 6219*2^3374198+1

Honza
Volunteer moderator
Volunteer tester
Project scientist

Joined: 15 Aug 05
Posts: 1957
ID: 352
Credit: 6,128,462,973
RAC: 2,260,686

Message 129882 - Posted: 27 May 2019 | 10:57:41 UTC

See Welcome to PrimeGrid Manual Sieving
____________
My stats

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 130165 - Posted: 5 Jun 2019 | 10:23:18 UTC - in response to Message 129471.

wait, didn't it run out again?
____________
My lucky number is 6219*2^3374198+1

theAy

Joined: 17 Nov 08
Posts: 15
ID: 31812
Credit: 14,296,657
RAC: 0

Message 130331 - Posted: 11 Jun 2019 | 12:30:33 UTC - in response to Message 102751.

Oh nice, there is new work available. Therefore, the current status of the manual sieving is

current new optimal percentage n depth depth done 15 26000P 26000P 100% 16 66382P 120000P 55% 17 175466P 250000P 70% 18 300010P 420000P 71% 19 429395P 460000P 93% 20 242000P 300000P 80% 21 900000P 900000P 100% 22 753200P 950000P 79%

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 130349 - Posted: 12 Jun 2019 | 10:27:43 UTC - in response to Message 130331.

Out again???
I didn't even get a chance to reserve anything!
____________
My lucky number is 6219*2^3374198+1

darkclown
Volunteer tester

Joined: 3 Oct 06
Posts: 331
ID: 3605
Credit: 1,443,342,948
RAC: 650,658

Message 130362 - Posted: 13 Jun 2019 | 5:12:19 UTC - in response to Message 130349.

Out again???
I didn't even get a chance to reserve anything!

There's plenty. Did you look at the Manual Sieving page?

____________
My lucky #: 60133106^131072+1 (GFN 17-mega)

dannyridel
Volunteer tester

Joined: 3 Feb 19
Posts: 997
ID: 1097922
Credit: 86,117,222
RAC: 26,400

Message 130366 - Posted: 13 Jun 2019 | 13:24:38 UTC - in response to Message 130362.

On my computer it says that 'No New Reservations' for all GFN sieving.
____________
My lucky number is 6219*2^3374198+1

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 130367 - Posted: 13 Jun 2019 | 13:59:34 UTC - in response to Message 130366.

On my computer it says that 'No New Reservations' for all GFN sieving.

All the other tasks at PrimeGrid are controlled by the server, but manual sieving is controlled by me, personally, by hand. It's only for experienced users, users who do not need a large amount of hand-holding to get things done. People who have a track record of getting things done on their own. When people are just following the instructions that someone else has given them without fully understanding what they're doing, tasks get done incorrectly. If you mess up a BOINC configuration or a PRPNet configuration, the server handles that automatically. When you mess up a manual sieving reservation, I need to personally clean up the mess.

Because of this, I can choose who does manual sieving, and who can't. I do not feel that you are a good candidate for manual sieving. We have lots of other projects that are more automated, which you can participate in if you wish.

vaughan

Joined: 11 Aug 05
Posts: 336
ID: 224
Credit: 11,521,678,721
RAC: 27,089,998

Message 130378 - Posted: 14 Jun 2019 | 7:37:46 UTC

I get the same message Jim but I have successfully completed 37,339,217 points in the Project Staging Area previously. Perhaps you can allow some more users again?

JimB
Honorary cruncher

Joined: 4 Aug 11
Posts: 920
ID: 107307
Credit: 989,207,162
RAC: 300,698

Message 130379 - Posted: 14 Jun 2019 | 9:08:21 UTC - in response to Message 130378.

I get the same message Jim but I have successfully completed 37,339,217 points in the Project Staging Area previously. Perhaps you can allow some more users again?

I just logged in to your account and all manual sieving is available to you. You can have up to 10 simultaneous open reservations with a maximum size of 342P each at the moment. I have no idea what you were looking at as I didn't change anything.

Message boards : Sieving : GFN Optimal Sieving Levels