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Message boards : Generalized Fermat Prime Search : GFN-15 CPU tasks are disabled!

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Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,381,937)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,789,310)PPS LLR Ruby: Earned 2,000,000 credits (2,082,200)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Jade: Earned 10,000,000 credits (16,891,162)SR5 LLR Turquoise: Earned 5,000,000 credits (7,216,756)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Sapphire: Earned 20,000,000 credits (20,104,046)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (5,885,282)GFN Emerald: Earned 50,000,000 credits (51,559,441)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 114012 - Posted: 31 Jan 2018 | 22:08:19 UTC

It has happened a little sooner than I anticipated, but it seems we've hit the B limit on CPU tasks. We've started seeing "Maxerror exceeded" errors.

I have therefore disabled CPU tasks on GFN-15, making it a GPU-only project. For the time being, it's still possible to select CPU tasks on the preferences page, but I'll be removing that ability in the near future. Regardless of the setting, no more CPU tasks will be sent out.


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Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

My lucky number is 75898^524288+1

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,381,937)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,789,310)PPS LLR Ruby: Earned 2,000,000 credits (2,082,200)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Jade: Earned 10,000,000 credits (16,891,162)SR5 LLR Turquoise: Earned 5,000,000 credits (7,216,756)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Sapphire: Earned 20,000,000 credits (20,104,046)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (5,885,282)GFN Emerald: Earned 50,000,000 credits (51,559,441)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 114014 - Posted: 31 Jan 2018 | 22:29:13 UTC

The checkbox on the preferences screen is now greyed out and is no longer selectable.
____________
Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

My lucky number is 75898^524288+1

JeppeSNProject donor
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321 LLR Bronze: Earned 10,000 credits (48,835)ESP LLR Bronze: Earned 10,000 credits (13,226)PPS LLR Gold: Earned 500,000 credits (902,999)SoB LLR Silver: Earned 100,000 credits (132,293)SR5 LLR Bronze: Earned 10,000 credits (16,010)TRP LLR Bronze: Earned 10,000 credits (14,746)PSA Turquoise: Earned 5,000,000 credits (7,614,290)
Message 114015 - Posted: 31 Jan 2018 | 22:31:55 UTC - in response to Message 114012.

It has happened a little sooner than I anticipated,


Yeah, the "B" limits thread has been saying b = 99,710,000. /JeppeSN

Profile Rick Reynolds
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Found 2 primes in the 2018 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,148,880)Cullen LLR Amethyst: Earned 1,000,000 credits (1,064,682)ESP LLR Ruby: Earned 2,000,000 credits (2,084,793)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,686,707)PPS LLR Turquoise: Earned 5,000,000 credits (8,646,622)PSP LLR Amethyst: Earned 1,000,000 credits (1,169,582)SoB LLR Ruby: Earned 2,000,000 credits (2,798,257)SR5 LLR Jade: Earned 10,000,000 credits (11,168,217)SGS LLR Turquoise: Earned 5,000,000 credits (5,943,634)TRP LLR Turquoise: Earned 5,000,000 credits (5,110,887)Woodall LLR Amethyst: Earned 1,000,000 credits (1,806,855)321 Sieve (suspended) Bronze: Earned 10,000 credits (54,591)Cullen/Woodall Sieve (suspended) Double Bronze: Earned 100,000,000 credits (127,922,665)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,218,403)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,655,954,320)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,134,964)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,013,696)AP 26/27 Emerald: Earned 50,000,000 credits (56,792,021)GFN Double Bronze: Earned 100,000,000 credits (100,757,953)PSA Double Amethyst: Earned 1,000,000,000 credits (1,370,700,486)
Message 114016 - Posted: 31 Jan 2018 | 22:35:22 UTC

Might be just be pure coincidence but I had 3 systems fail to report and get new tasks. They were all accessible via the internet and I manually did a project update with no issues. They are running gfn 16 and ppse. No 15's were involved.

Cheers

McHazard
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PPS LLR Silver: Earned 100,000 credits (238,222)SoB LLR Gold: Earned 500,000 credits (528,908)SR5 LLR Silver: Earned 100,000 credits (109,548)SGS LLR Bronze: Earned 10,000 credits (58,314)TRP LLR Silver: Earned 100,000 credits (124,824)Generalized Cullen/Woodall Sieve Amethyst: Earned 1,000,000 credits (1,292,040)PSA Bronze: Earned 10,000 credits (38,810)
Message 114017 - Posted: 31 Jan 2018 | 22:57:54 UTC
Last modified: 31 Jan 2018 | 23:02:29 UTC

Started running these a few days ago to push it the rest of the way, but I didn't expect it to happen immediately!

Does 3.3.3 increase the b-limit at all? Or, enough that we won't immediately hit it again?

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,381,937)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,789,310)PPS LLR Ruby: Earned 2,000,000 credits (2,082,200)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Jade: Earned 10,000,000 credits (16,891,162)SR5 LLR Turquoise: Earned 5,000,000 credits (7,216,756)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Sapphire: Earned 20,000,000 credits (20,104,046)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (5,885,282)GFN Emerald: Earned 50,000,000 credits (51,559,441)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 114019 - Posted: 31 Jan 2018 | 23:13:40 UTC - in response to Message 114017.

Started running these a few days ago to push it the rest of the way, but I didn't expect it to happen immediately!

Does 3.3.3 increase the b-limit at all?


I'm still working on gathering data to intelligently answer that question. As best as I can tell right now, it raises the b limit a little, but probably not enough. By the time it goes into production, we'll be real close to the point where it starts exceeding the error limit on some tests. Even if we were ready to put it into production today, it might only buy us an extra month or two.
____________
Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

My lucky number is 75898^524288+1

KishinCat
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Cullen LLR Bronze: Earned 10,000 credits (29,457)Generalized Cullen/Woodall Sieve Silver: Earned 100,000 credits (108,667)PPS Sieve Bronze: Earned 10,000 credits (70,791)AP 26/27 Silver: Earned 100,000 credits (234,494)GFN Silver: Earned 100,000 credits (321,012)
Message 114093 - Posted: 1 Feb 2018 | 21:48:19 UTC

Apologies for being new to this, but google doesn't very well help me figure out what a "B limit" is, could someone help me in understanding this better?

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 11014
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,381,937)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,789,310)PPS LLR Ruby: Earned 2,000,000 credits (2,082,200)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Jade: Earned 10,000,000 credits (16,891,162)SR5 LLR Turquoise: Earned 5,000,000 credits (7,216,756)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Sapphire: Earned 20,000,000 credits (20,104,046)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (5,885,282)GFN Emerald: Earned 50,000,000 credits (51,559,441)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 114095 - Posted: 1 Feb 2018 | 23:06:40 UTC - in response to Message 114093.

Apologies for being new to this, but google doesn't very well help me figure out what a "B limit" is, could someone help me in understanding this better?


No apology is necessary. That's an excellent question.

Generalized Fermat numbers are numbers of the form b^n+1, where n is a power of 2. They can also be written as b^2^n+1. GFN-15 refers to b^32768+1, or b^2^15+1. B is an even, positive integer.

We use a program called Genefer, written by Yves Gallot, to test these numbers to see if they are probable primes (PRPs). While there are other programs that can test GFNs to see if they are PRPs, Genefer's algorithm is much faster. It's also capable of running on a GPU, whereas the other programs can't. By far, it's the best choice for testing GFNs.

But the Genefer algorithm has inherent limitations that the more generalized programs such as LLR or PFGW do not. In particular, it can only test GFNs where b is below a certain value. This is what is meant by the 'b limit'. For version 3.3.2 of the CPU variant of Genefer, this limit had been predicted to be close to b=99,000,000. However, Genefer's internal loss-of-precision protection started detecting that the calculations were becoming unreliable somewhat earlier than expected, in the vicinity of b=89,000,000.

As a result no more CPU tasks will be sent out for GFN-15.

The GPU variant of Genefer is capable of going up to b=400,000,000, so GFN-15 will continue as a GPU-only project.
____________
Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

My lucky number is 75898^524288+1

XAVER
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Discovered the World's First base 79 Generalized Cullen prime!!!Discovered 1 mega prime321 LLR Amethyst: Earned 1,000,000 credits (1,625,290)Cullen LLR Amethyst: Earned 1,000,000 credits (1,058,226)ESP LLR Amethyst: Earned 1,000,000 credits (1,039,576)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,024,032)PPS LLR Ruby: Earned 2,000,000 credits (2,180,790)PSP LLR Amethyst: Earned 1,000,000 credits (1,105,896)SoB LLR Ruby: Earned 2,000,000 credits (2,625,433)SR5 LLR Amethyst: Earned 1,000,000 credits (1,386,687)SGS LLR Gold: Earned 500,000 credits (782,944)TRP LLR Amethyst: Earned 1,000,000 credits (1,537,631)Woodall LLR Amethyst: Earned 1,000,000 credits (1,036,306)Generalized Cullen/Woodall Sieve Amethyst: Earned 1,000,000 credits (1,002,733)PPS Sieve Sapphire: Earned 20,000,000 credits (20,057,450)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,065,490)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,000,543)AP 26/27 Turquoise: Earned 5,000,000 credits (5,255,900)GFN Sapphire: Earned 20,000,000 credits (20,968,183)PSA Turquoise: Earned 5,000,000 credits (5,908,897)
Message 114096 - Posted: 1 Feb 2018 | 23:42:08 UTC

You should also delete "CPU" on the title page at the genefer-15 line

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de Primes321 LLR Amethyst: Earned 1,000,000 credits (1,381,937)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,789,310)PPS LLR Ruby: Earned 2,000,000 credits (2,082,200)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Jade: Earned 10,000,000 credits (16,891,162)SR5 LLR Turquoise: Earned 5,000,000 credits (7,216,756)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Ruby: Earned 2,000,000 credits (2,433,520)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Sapphire: Earned 20,000,000 credits (20,104,046)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Turquoise: Earned 5,000,000 credits (5,885,282)GFN Emerald: Earned 50,000,000 credits (51,559,441)PSA Jade: Earned 10,000,000 credits (10,038,118)
Message 114097 - Posted: 1 Feb 2018 | 23:51:41 UTC - in response to Message 114096.

You should also delete "CPU" on the title page at the genefer-15 line


Thanks. There's probably a few other places too.
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Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

My lucky number is 75898^524288+1

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