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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: 274
ID: 880615
Credit: 823,947,522
RAC: 40
Discovered 5 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 StageFound 1 prime in the 2021 Tour de PrimesFound 2 primes in the 2022 Tour de PrimesFound 1 mega prime in the 2022 Tour de PrimesFound 1 prime in the 2023 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,014,730)Cullen LLR Ruby: Earned 2,000,000 credits (2,080,460)ESP LLR Gold: Earned 500,000 credits (502,799)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,000,054)PPS LLR Double Bronze: Earned 100,000,000 credits (103,292,338)PSP LLR Amethyst: Earned 1,000,000 credits (1,092,773)SoB LLR Sapphire: Earned 20,000,000 credits (41,382,619)SR5 LLR Sapphire: Earned 20,000,000 credits (21,787,728)SGS LLR Sapphire: Earned 20,000,000 credits (20,284,625)TRP LLR Gold: Earned 500,000 credits (821,174)Woodall LLR Jade: Earned 10,000,000 credits (15,028,246)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,084,376)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (30,065,949)AP 26/27 Double Silver: Earned 200,000,000 credits (257,818,067)GFN Double Bronze: Earned 100,000,000 credits (185,033,172)WW (retired) Emerald: Earned 50,000,000 credits (59,040,000)PSA Emerald: Earned 50,000,000 credits (53,011,665)
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?

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Profile Rafael
Volunteer tester
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Joined: 22 Oct 14
Posts: 912
ID: 370496
Credit: 552,842,353
RAC: 469,151
Discovered 2 mega primesFound 1 prime in the 2023 Tour de PrimesFound 1 mega prime in the 2023 Tour de PrimesFound 1 prime in the 2023 Tour de Primes Mountain StageFound 1 mega prime in the 2023 Tour de Primes Mountain Stage321 LLR Jade: Earned 10,000,000 credits (10,008,611)Cullen LLR Jade: Earned 10,000,000 credits (10,005,009)ESP LLR Jade: Earned 10,000,000 credits (10,041,747)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,000,820)PPS LLR Jade: Earned 10,000,000 credits (10,143,649)PSP LLR Jade: Earned 10,000,000 credits (10,049,767)SoB LLR Sapphire: Earned 20,000,000 credits (49,581,897)SR5 LLR Jade: Earned 10,000,000 credits (10,003,746)SGS LLR Jade: Earned 10,000,000 credits (10,002,215)TRP LLR Jade: Earned 10,000,000 credits (10,011,903)Woodall LLR Jade: Earned 10,000,000 credits (10,076,850)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,033,828)Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (11,238,627)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 Emerald: Earned 50,000,000 credits (50,015,953)GFN Emerald: Earned 50,000,000 credits (85,796,469)WW (retired) Emerald: Earned 50,000,000 credits (50,712,000)PSA Double Bronze: Earned 100,000,000 credits (170,761,999)
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.

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Dirk SellstedProject donor
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Joined: 15 Feb 17
Posts: 197
ID: 492091
Credit: 261,055,846
RAC: 652,012
Discovered 2 mega primesFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2023 Tour de PrimesFound 1 mega prime in the 2023 Tour de Primes321 LLR Gold: Earned 500,000 credits (882,605)Cullen LLR Gold: Earned 500,000 credits (541,729)ESP LLR Gold: Earned 500,000 credits (875,286)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (583,113)PPS LLR Sapphire: Earned 20,000,000 credits (31,723,172)PSP LLR Turquoise: Earned 5,000,000 credits (8,199,845)SoB LLR Turquoise: Earned 5,000,000 credits (5,204,086)SR5 LLR Turquoise: Earned 5,000,000 credits (5,026,610)SGS LLR Ruby: Earned 2,000,000 credits (3,291,711)TRP LLR Ruby: Earned 2,000,000 credits (4,111,585)Woodall LLR Gold: Earned 500,000 credits (626,978)321 Sieve (suspended) Gold: Earned 500,000 credits (551,946)Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (3,901,770)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,321,574)PPS Sieve Sapphire: Earned 20,000,000 credits (35,270,773)TRP Sieve (suspended) Gold: Earned 500,000 credits (528,024)AP 26/27 Jade: Earned 10,000,000 credits (10,588,617)GFN Emerald: Earned 50,000,000 credits (89,101,442)WW (retired) Sapphire: Earned 20,000,000 credits (20,100,000)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.

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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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