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Message boards : Sierpinski/Riesel Base 5 Problem : Task took longer?

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Profile TylerProject donor
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Joined: 4 Dec 12
Posts: 1077
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Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,238,816)Cullen LLR Turquoise: Earned 5,000,000 credits (5,124,261)ESP LLR Turquoise: Earned 5,000,000 credits (9,951,501)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,677,745)PPS LLR Sapphire: Earned 20,000,000 credits (31,163,676)PSP LLR Sapphire: Earned 20,000,000 credits (37,386,303)SoB LLR Sapphire: Earned 20,000,000 credits (21,323,435)SR5 LLR Sapphire: Earned 20,000,000 credits (33,215,655)SGS LLR Turquoise: Earned 5,000,000 credits (5,000,408)TRP LLR Jade: Earned 10,000,000 credits (12,199,250)Woodall LLR Turquoise: Earned 5,000,000 credits (8,449,472)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,012,059)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (27,921,016)PPS Sieve Double Gold: Earned 500,000,000 credits (598,639,035)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,990,608)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,217,057)AP 26/27 Turquoise: Earned 5,000,000 credits (7,111,637)GFN Sapphire: Earned 20,000,000 credits (33,485,812)WW Jade: Earned 10,000,000 credits (13,440,000)PSA Double Silver: Earned 200,000,000 credits (420,586,383)
Message 69313 - Posted: 20 Sep 2013 | 0:05:33 UTC

I saw this one SR5 task of mine that took almost 12,000 seconds when they usually run 6-9k seconds... The long task is http://www.primegrid.com/result.php?resultid=483864728 and an example of one of the shorter ones is http://www.primegrid.com/result.php?resultid=483804467

Why is this? They were both completed today, and the long one validated just fine, not prime. Since it was taking ~2x as long as normal, I thought it might have been a serpinski prime, since in http://www.primegrid.com/forum_thread.php?id=5203 mike says this:

Sierpinski (+1) primes "only" take twice as long.
Just seems weird that it took twice as long and was not prime. Could have it thought it was a prime and on the second pass that took longer it found it was not prime?

Thanks,
-1998golfer
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275*2^3585539+1 is prime!!! (1079358 digits)

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Profile TheDawgzProject donor
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321 LLR Sapphire: Earned 20,000,000 credits (20,123,442)Cullen LLR Sapphire: Earned 20,000,000 credits (20,189,376)ESP LLR Sapphire: Earned 20,000,000 credits (20,115,673)Generalized Cullen/Woodall LLR Sapphire: Earned 20,000,000 credits (20,124,061)PPS LLR Emerald: Earned 50,000,000 credits (60,517,973)PSP LLR Sapphire: Earned 20,000,000 credits (20,339,896)SoB LLR Sapphire: Earned 20,000,000 credits (21,214,245)SR5 LLR Sapphire: Earned 20,000,000 credits (20,710,959)SGS LLR Jade: Earned 10,000,000 credits (10,404,749)TRP LLR Sapphire: Earned 20,000,000 credits (20,743,624)Woodall LLR Sapphire: Earned 20,000,000 credits (21,804,003)321 Sieve (suspended) Silver: Earned 100,000 credits (200,220)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (6,710,149)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,184)PPS Sieve Emerald: Earned 50,000,000 credits (57,182,910)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,251,279)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (3,572,416)AP 26/27 Gold: Earned 500,000 credits (543,507)GFN Sapphire: Earned 20,000,000 credits (21,199,917)PSA Double Silver: Earned 200,000,000 credits (248,258,813)
Message 69315 - Posted: 20 Sep 2013 | 1:52:45 UTC - in response to Message 69313.
Last modified: 20 Sep 2013 | 1:54:42 UTC

It appears that the work units used two different sized FFT's - normal for SR5 as far as TheDawgz recall.
384k for the longer run
320k for the shorter run
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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 PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,132,712)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,347,050)PPS LLR Sapphire: Earned 20,000,000 credits (20,751,038)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,718,606)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)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 Jade: Earned 10,000,000 credits (10,118,303)GFN Emerald: Earned 50,000,000 credits (78,031,938)WW Sapphire: Earned 20,000,000 credits (32,204,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 69316 - Posted: 20 Sep 2013 | 2:06:32 UTC
Last modified: 20 Sep 2013 | 2:06:48 UTC

The Dawgz are barking up the correct tree.
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My lucky number is 75898524288+1

Message boards : Sierpinski/Riesel Base 5 Problem : Task took longer?

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