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Message boards : Sieving : Is it really better to run two command lines sieves on a single GPU?

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Profile Jordan Romaidis
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Joined: 11 May 17
Posts: 213
ID: 880615
Credit: 645,444,811
RAC: 515,106
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 2 primes in the 2020 Tour de PrimesFound 1 mega prime in the 2020 Tour de PrimesFound 1 prime in the 2020 Tour de Primes Mountain StageFound 1 mega prime in the 2020 Tour de Primes Mountain Stage321 LLR Ruby: Earned 2,000,000 credits (4,574,478)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,325)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Emerald: Earned 50,000,000 credits (89,494,096)PSP LLR Bronze: Earned 10,000 credits (23,710)SoB LLR Sapphire: Earned 20,000,000 credits (39,985,666)SR5 LLR Jade: Earned 10,000,000 credits (16,535,456)SGS LLR Jade: Earned 10,000,000 credits (14,727,141)TRP LLR Gold: Earned 500,000 credits (525,711)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve Amethyst: Earned 1,000,000 credits (1,062,420)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,296,981)AP 26/27 Double Silver: Earned 200,000,000 credits (217,420,411)GFN Double Bronze: Earned 100,000,000 credits (140,698,117)PSA Emerald: Earned 50,000,000 credits (52,891,089)
Message 111950 - Posted: 28 Nov 2017 | 19:30:53 UTC

I thought I read somewhere around here running two is actually more efficient...?

I noticed using HWMonitor that sometimes my GPU utilization is jumping from 0% to 100% constantly. Other times, it seems to stay at a solid 100%. I could see in scenario 1 how running two Sieves would fill in that 0% gap but if it's already at 100% should I just run one sieve?

Profile Rafael
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Joined: 22 Oct 14
Posts: 857
ID: 370496
Credit: 304,459,431
RAC: 90,496
321 LLR Turquoise: Earned 5,000,000 credits (6,975,684)Cullen LLR Turquoise: Earned 5,000,000 credits (6,231,526)ESP LLR Turquoise: Earned 5,000,000 credits (6,103,479)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,182,588)PPS LLR Turquoise: Earned 5,000,000 credits (6,346,543)PSP LLR Turquoise: Earned 5,000,000 credits (6,252,934)SoB LLR Turquoise: Earned 5,000,000 credits (6,187,450)SR5 LLR Turquoise: Earned 5,000,000 credits (6,764,477)SGS LLR Turquoise: Earned 5,000,000 credits (6,557,795)TRP LLR Turquoise: Earned 5,000,000 credits (6,155,477)Woodall LLR Turquoise: Earned 5,000,000 credits (6,108,237)321 Sieve Ruby: Earned 2,000,000 credits (2,977,459)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (10,037,204)PPS Sieve Jade: Earned 10,000,000 credits (10,305,147)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,000,053)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,030,160)AP 26/27 Jade: Earned 10,000,000 credits (10,253,048)GFN Sapphire: Earned 20,000,000 credits (26,232,525)PSA Double Bronze: Earned 100,000,000 credits (170,758,062)
Message 111951 - Posted: 28 Nov 2017 | 19:59:48 UTC - in response to Message 111950.

I thought I read somewhere around here running two is actually more efficient...?

I noticed using HWMonitor that sometimes my GPU utilization is jumping from 0% to 100% constantly. Other times, it seems to stay at a solid 100%. I could see in scenario 1 how running two Sieves would fill in that 0% gap but if it's already at 100% should I just run one sieve?

There's no harm in just trying and seeing what works best for you... you can either get a big boost or none at all, depending on your hardware and the type of sieve you're doing.

Dirk SellstedProject donor
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Joined: 15 Feb 17
Posts: 149
ID: 492091
Credit: 136,919,308
RAC: 0
Found 1 prime in the 2018 Tour de Primes321 LLR Gold: Earned 500,000 credits (860,905)Cullen LLR Gold: Earned 500,000 credits (506,431)ESP LLR Gold: Earned 500,000 credits (818,638)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (513,349)PPS LLR Ruby: Earned 2,000,000 credits (2,605,836)PSP LLR Gold: Earned 500,000 credits (555,892)SoB LLR Ruby: Earned 2,000,000 credits (2,296,322)SR5 LLR Ruby: Earned 2,000,000 credits (3,858,489)SGS LLR Amethyst: Earned 1,000,000 credits (1,410,704)TRP LLR Gold: Earned 500,000 credits (765,119)Woodall LLR Gold: Earned 500,000 credits (532,512)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,321,574)PPS Sieve Sapphire: Earned 20,000,000 credits (21,786,773)TRP Sieve (suspended) Gold: Earned 500,000 credits (528,024)AP 26/27 Jade: Earned 10,000,000 credits (10,220,704)GFN Sapphire: Earned 20,000,000 credits (49,709,755)PSA Sapphire: Earned 20,000,000 credits (34,628,282)
Message 111952 - Posted: 28 Nov 2017 | 21:08:03 UTC

it's very hardware dependant and sieve file dependant. my best gpu preferred 6-7 files of gfn 16 but only 2-3 of 21. also had to play with B sizes.

Message boards : Sieving : Is it really better to run two command lines sieves on a single GPU?

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