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

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Profile 1998golferProject donor
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Joined: 4 Dec 12
Posts: 1049
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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 Ruby: Earned 2,000,000 credits (3,733,901)Cullen LLR Turquoise: Earned 5,000,000 credits (5,124,261)ESP LLR Turquoise: Earned 5,000,000 credits (7,870,183)Generalized Cullen/Woodall LLR Emerald: Earned 50,000,000 credits (50,656,837)PPS LLR Jade: Earned 10,000,000 credits (11,893,917)PSP LLR Sapphire: Earned 20,000,000 credits (36,318,010)SoB LLR Sapphire: Earned 20,000,000 credits (21,004,651)SR5 LLR Sapphire: Earned 20,000,000 credits (32,288,823)SGS LLR Ruby: Earned 2,000,000 credits (2,771,356)TRP LLR Turquoise: Earned 5,000,000 credits (5,867,891)Woodall LLR Ruby: Earned 2,000,000 credits (2,824,779)321 Sieve Turquoise: Earned 5,000,000 credits (5,863,434)Generalized Cullen/Woodall Sieve Sapphire: Earned 20,000,000 credits (27,921,016)PPS Sieve Double Silver: Earned 200,000,000 credits (342,861,039)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 (5,445,921)GFN Sapphire: Earned 20,000,000 credits (20,125,379)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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Profile TheDawgzProject donor
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321 LLR Jade: Earned 10,000,000 credits (10,043,076)Cullen LLR Jade: Earned 10,000,000 credits (10,256,286)ESP LLR Jade: Earned 10,000,000 credits (10,075,118)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,184,133)PPS LLR Emerald: Earned 50,000,000 credits (54,952,284)PSP LLR Jade: Earned 10,000,000 credits (10,037,823)SoB LLR Jade: Earned 10,000,000 credits (10,053,795)SR5 LLR Sapphire: Earned 20,000,000 credits (20,710,959)SGS LLR Jade: Earned 10,000,000 credits (10,026,927)TRP LLR Jade: Earned 10,000,000 credits (14,204,693)Woodall LLR Turquoise: Earned 5,000,000 credits (7,598,163)321 Sieve Silver: Earned 100,000 credits (200,220)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (6,710,149)Generalized Cullen/Woodall Sieve 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 Primes321 LLR Ruby: Earned 2,000,000 credits (2,063,182)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Ruby: Earned 2,000,000 credits (4,165,092)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Ruby: Earned 2,000,000 credits (2,773,744)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Sapphire: Earned 20,000,000 credits (34,158,496)SR5 LLR Turquoise: Earned 5,000,000 credits (8,293,415)SGS LLR Ruby: Earned 2,000,000 credits (2,012,222)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,046,112)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)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 (7,090,096)GFN Emerald: Earned 50,000,000 credits (64,594,991)PSA Jade: Earned 10,000,000 credits (10,540,036)
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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Message boards : Sierpinski/Riesel Base 5 Problem : Task took longer?

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