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Message boards : General discussion : proth sieve cuda & opencl

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Joined: 25 Nov 09
Posts: 3069
ID: 50683
Credit: 63,378,402
RAC: 486
Eliminated 1 conjecture "k"Found 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 1 prime in the 2021 Tour de Primes321 LLR Silver: Earned 100,000 credits (229,492)Cullen LLR Silver: Earned 100,000 credits (110,733)PPS LLR Jade: Earned 10,000,000 credits (11,335,374)PSP LLR Silver: Earned 100,000 credits (104,385)SoB LLR Silver: Earned 100,000 credits (106,117)SR5 LLR Silver: Earned 100,000 credits (139,802)SGS LLR Amethyst: Earned 1,000,000 credits (1,325,207)TRP LLR Gold: Earned 500,000 credits (626,755)Woodall LLR Silver: Earned 100,000 credits (122,944)321 Sieve (suspended) Silver: Earned 100,000 credits (104,900)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,000,599)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (515,556)PPS Sieve Jade: Earned 10,000,000 credits (11,872,830)TRP Sieve (suspended) Silver: Earned 100,000 credits (255,612)AP 26/27 Ruby: Earned 2,000,000 credits (2,583,960)GFN Sapphire: Earned 20,000,000 credits (23,334,026)WW Amethyst: Earned 1,000,000 credits (1,088,000)PSA Turquoise: Earned 5,000,000 credits (7,522,050)
Message 97721 - Posted: 15 Aug 2016 | 21:06:01 UTC
Last modified: 15 Aug 2016 | 21:07:16 UTC

I have two GPU , one is GT 640 and another is Radeon 280.

If I use on Primegrid both card, then I always get 99% utilization of GPU and it is clearly that Radeon 280 is around 2 x faster then Gt 640 in sieve tasks.


I use ( for my project) program I get from https://sites.google.com/site/kenscode/prime-programs

After one hour of experimenting with values and switches, I got 88 Mp/s on GT 640 and 97 % GPU load
Syntax is -p166729534762177 -P200000000000000 -i sr_2.abcd -f factors.txt -r 3600 -m 127 -B 65535 -C 65535
In meantime CPU utilization is around 5% for that CUDA APP

But not even after hours and countless combination of switches I cannot get more then 30 % GPU utilization on Radeon 280. Top speed is 28 Mp/s and with that condition it uses nearly full CPU core.

Does anybody here know how to increase speed on sieving but using only one CPU core ( so I cannot start more threads since that will use more then one CPU core I can spent.

Thanks fro any reply
____________
92*10^1439761-1 NEAR-REPDIGIT PRIME :) :) :)
4 * 650^498101-1 CRUS PRIME
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Message boards : General discussion : proth sieve cuda & opencl

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