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Message boards : Sieving : OpenCL Intel Graphics Sieving

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Joined: 14 Sep 12
Posts: 591
ID: 172547
Credit: 1,456,388,683
RAC: 2,762,867
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2019 Tour de PrimesFound 15 primes in the 2020 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (11,983,704)Cullen LLR Turquoise: Earned 5,000,000 credits (5,894,611)ESP LLR Jade: Earned 10,000,000 credits (10,390,853)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,882,966)PPS LLR Sapphire: Earned 20,000,000 credits (30,245,261)PSP LLR Jade: Earned 10,000,000 credits (10,509,062)SoB LLR Ruby: Earned 2,000,000 credits (2,445,976)SR5 LLR Jade: Earned 10,000,000 credits (12,866,436)SGS LLR Jade: Earned 10,000,000 credits (10,552,224)TRP LLR Jade: Earned 10,000,000 credits (16,438,861)Woodall LLR Turquoise: Earned 5,000,000 credits (5,152,091)321 Sieve Jade: Earned 10,000,000 credits (15,974,108)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)PPS Sieve Double Silver: Earned 200,000,000 credits (261,023,272)TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)AP 26/27 Emerald: Earned 50,000,000 credits (85,808,632)GFN Double Silver: Earned 200,000,000 credits (303,068,714)PSA Double Gold: Earned 500,000,000 credits (666,025,256)
Message 120158 - Posted: 27 Aug 2018 | 2:59:48 UTC

There is not much one can do with an Intel GPU, but I've found the OpenCL sieving (gfn opencl sieving app) will work with one laptop's Intel HD Graphics 4000 GPU. Its pretty poor performance, but it does work. Better than nothing. With this i3 CPU I am able to get it up to 2.4p/day when running two simultaneous tasks. Doing about 1.2p/day each using B9. Any higher and it refuses to run. No B10 or greater. Hardly anything compared with a 1060 at 105p/day but it is still something.

Profile Rafael
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Joined: 22 Oct 14
Posts: 862
ID: 370496
Credit: 317,163,633
RAC: 172,973
321 LLR Turquoise: Earned 5,000,000 credits (7,001,858)Cullen LLR Turquoise: Earned 5,000,000 credits (7,013,155)ESP LLR Turquoise: Earned 5,000,000 credits (7,130,193)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (7,138,464)PPS LLR Turquoise: Earned 5,000,000 credits (6,998,227)PSP LLR Turquoise: Earned 5,000,000 credits (6,995,135)SoB LLR Turquoise: Earned 5,000,000 credits (6,868,921)SR5 LLR Turquoise: Earned 5,000,000 credits (7,024,046)SGS LLR Turquoise: Earned 5,000,000 credits (7,141,730)TRP LLR Turquoise: Earned 5,000,000 credits (8,751,781)Woodall LLR Turquoise: Earned 5,000,000 credits (6,877,310)321 Sieve Ruby: Earned 2,000,000 credits (4,679,038)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 (28,175,384)PSA Double Bronze: Earned 100,000,000 credits (170,758,062)
Message 120160 - Posted: 27 Aug 2018 | 10:46:04 UTC - in response to Message 120158.

There is not much one can do with an Intel GPU, but I've found the OpenCL sieving (gfn opencl sieving app) will work with one laptop's Intel HD Graphics 4000 GPU. Its pretty poor performance, but it does work. Better than nothing. With this i3 CPU I am able to get it up to 2.4p/day when running two simultaneous tasks. Doing about 1.2p/day each using B9. Any higher and it refuses to run. No B10 or greater. Hardly anything compared with a 1060 at 105p/day but it is still something.

Yes, sieving does work on iGPUs...

...but it's just not worth it. The thing is that it steals so much memory bandwidth that the CPU tasks get starved. From my testing, even SGS (which is pretty tamed with RAM, in comparison to the other LLR projects) loses performance: 1 unit was fine, 2 had a small loss, 3 and 4 just got destroyed. And keep in mind, that was with dual channel, dual rank, 3000mhz DDR4, so it's not as if I had slow RAM there to limit me.

If there was a sieving challenge, I guess you could use the iGPU to squeeze as much as you can. But outside of that, it's not a good idea to sacrifice on LLR to run GFN-SV.

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Joined: 14 Sep 12
Posts: 591
ID: 172547
Credit: 1,456,388,683
RAC: 2,762,867
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2019 Tour de PrimesFound 15 primes in the 2020 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (11,983,704)Cullen LLR Turquoise: Earned 5,000,000 credits (5,894,611)ESP LLR Jade: Earned 10,000,000 credits (10,390,853)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,882,966)PPS LLR Sapphire: Earned 20,000,000 credits (30,245,261)PSP LLR Jade: Earned 10,000,000 credits (10,509,062)SoB LLR Ruby: Earned 2,000,000 credits (2,445,976)SR5 LLR Jade: Earned 10,000,000 credits (12,866,436)SGS LLR Jade: Earned 10,000,000 credits (10,552,224)TRP LLR Jade: Earned 10,000,000 credits (16,438,861)Woodall LLR Turquoise: Earned 5,000,000 credits (5,152,091)321 Sieve Jade: Earned 10,000,000 credits (15,974,108)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)PPS Sieve Double Silver: Earned 200,000,000 credits (261,023,272)TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)AP 26/27 Emerald: Earned 50,000,000 credits (85,808,632)GFN Double Silver: Earned 200,000,000 credits (303,068,714)PSA Double Gold: Earned 500,000,000 credits (666,025,256)
Message 120164 - Posted: 27 Aug 2018 | 15:02:42 UTC - in response to Message 120160.

There is not much one can do with an Intel GPU, but I've found the OpenCL sieving (gfn opencl sieving app) will work with one laptop's Intel HD Graphics 4000 GPU. Its pretty poor performance, but it does work. Better than nothing. With this i3 CPU I am able to get it up to 2.4p/day when running two simultaneous tasks. Doing about 1.2p/day each using B9. Any higher and it refuses to run. No B10 or greater. Hardly anything compared with a 1060 at 105p/day but it is still something.

Yes, sieving does work on iGPUs...

...but it's just not worth it. The thing is that it steals so much memory bandwidth that the CPU tasks get starved. From my testing, even SGS (which is pretty tamed with RAM, in comparison to the other LLR projects) loses performance: 1 unit was fine, 2 had a small loss, 3 and 4 just got destroyed. And keep in mind, that was with dual channel, dual rank, 3000mhz DDR4, so it's not as if I had slow RAM there to limit me.

If there was a sieving challenge, I guess you could use the iGPU to squeeze as much as you can. But outside of that, it's not a good idea to sacrifice on LLR to run GFN-SV.


I'll have to run several tasks and see what the performance loss is while running the sieves vs not running them. This little 2 core i3 does llr workunits as fast or faster than the i7 laptop and my fx 8350.

Profile Rafael
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Joined: 22 Oct 14
Posts: 862
ID: 370496
Credit: 317,163,633
RAC: 172,973
321 LLR Turquoise: Earned 5,000,000 credits (7,001,858)Cullen LLR Turquoise: Earned 5,000,000 credits (7,013,155)ESP LLR Turquoise: Earned 5,000,000 credits (7,130,193)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (7,138,464)PPS LLR Turquoise: Earned 5,000,000 credits (6,998,227)PSP LLR Turquoise: Earned 5,000,000 credits (6,995,135)SoB LLR Turquoise: Earned 5,000,000 credits (6,868,921)SR5 LLR Turquoise: Earned 5,000,000 credits (7,024,046)SGS LLR Turquoise: Earned 5,000,000 credits (7,141,730)TRP LLR Turquoise: Earned 5,000,000 credits (8,751,781)Woodall LLR Turquoise: Earned 5,000,000 credits (6,877,310)321 Sieve Ruby: Earned 2,000,000 credits (4,679,038)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 (28,175,384)PSA Double Bronze: Earned 100,000,000 credits (170,758,062)
Message 120166 - Posted: 27 Aug 2018 | 16:46:55 UTC - in response to Message 120164.

There is not much one can do with an Intel GPU, but I've found the OpenCL sieving (gfn opencl sieving app) will work with one laptop's Intel HD Graphics 4000 GPU. Its pretty poor performance, but it does work. Better than nothing. With this i3 CPU I am able to get it up to 2.4p/day when running two simultaneous tasks. Doing about 1.2p/day each using B9. Any higher and it refuses to run. No B10 or greater. Hardly anything compared with a 1060 at 105p/day but it is still something.

Yes, sieving does work on iGPUs...

...but it's just not worth it. The thing is that it steals so much memory bandwidth that the CPU tasks get starved. From my testing, even SGS (which is pretty tamed with RAM, in comparison to the other LLR projects) loses performance: 1 unit was fine, 2 had a small loss, 3 and 4 just got destroyed. And keep in mind, that was with dual channel, dual rank, 3000mhz DDR4, so it's not as if I had slow RAM there to limit me.

If there was a sieving challenge, I guess you could use the iGPU to squeeze as much as you can. But outside of that, it's not a good idea to sacrifice on LLR to run GFN-SV.


I'll have to run several tasks and see what the performance loss is while running the sieves vs not running them. This little 2 core i3 does llr workunits as fast or faster than the i7 laptop and my fx 8350.

It's worth testing yourself, yes. I tested way back in the day, Skylake was "new", LLR did not have multithreading, and numbers were smaller on some of the projects.

Profile PenguinProject donor
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Joined: 14 Sep 12
Posts: 591
ID: 172547
Credit: 1,456,388,683
RAC: 2,762,867
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2019 Tour de PrimesFound 15 primes in the 2020 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (11,983,704)Cullen LLR Turquoise: Earned 5,000,000 credits (5,894,611)ESP LLR Jade: Earned 10,000,000 credits (10,390,853)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,882,966)PPS LLR Sapphire: Earned 20,000,000 credits (30,245,261)PSP LLR Jade: Earned 10,000,000 credits (10,509,062)SoB LLR Ruby: Earned 2,000,000 credits (2,445,976)SR5 LLR Jade: Earned 10,000,000 credits (12,866,436)SGS LLR Jade: Earned 10,000,000 credits (10,552,224)TRP LLR Jade: Earned 10,000,000 credits (16,438,861)Woodall LLR Turquoise: Earned 5,000,000 credits (5,152,091)321 Sieve Jade: Earned 10,000,000 credits (15,974,108)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)PPS Sieve Double Silver: Earned 200,000,000 credits (261,023,272)TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)AP 26/27 Emerald: Earned 50,000,000 credits (85,808,632)GFN Double Silver: Earned 200,000,000 credits (303,068,714)PSA Double Gold: Earned 500,000,000 credits (666,025,256)
Message 120181 - Posted: 28 Aug 2018 | 1:05:18 UTC - in response to Message 120166.

There is not much one can do with an Intel GPU, but I've found the OpenCL sieving (gfn opencl sieving app) will work with one laptop's Intel HD Graphics 4000 GPU. Its pretty poor performance, but it does work. Better than nothing. With this i3 CPU I am able to get it up to 2.4p/day when running two simultaneous tasks. Doing about 1.2p/day each using B9. Any higher and it refuses to run. No B10 or greater. Hardly anything compared with a 1060 at 105p/day but it is still something.

Yes, sieving does work on iGPUs...

...but it's just not worth it. The thing is that it steals so much memory bandwidth that the CPU tasks get starved. From my testing, even SGS (which is pretty tamed with RAM, in comparison to the other LLR projects) loses performance: 1 unit was fine, 2 had a small loss, 3 and 4 just got destroyed. And keep in mind, that was with dual channel, dual rank, 3000mhz DDR4, so it's not as if I had slow RAM there to limit me.

If there was a sieving challenge, I guess you could use the iGPU to squeeze as much as you can. But outside of that, it's not a good idea to sacrifice on LLR to run GFN-SV.


I'll have to run several tasks and see what the performance loss is while running the sieves vs not running them. This little 2 core i3 does llr workunits as fast or faster than the i7 laptop and my fx 8350.

It's worth testing yourself, yes. I tested way back in the day, Skylake was "new", LLR did not have multithreading, and numbers were smaller on some of the projects.


:) This is no skylake. I think the i3 is an Ivy something or other. Will have to see the exact cpu core and specs and post em up. I just upgraded the RAM in that laptop from 6GB to 12GB maxing it out tonight. Only DDR3 1600.

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Joined: 14 Sep 12
Posts: 591
ID: 172547
Credit: 1,456,388,683
RAC: 2,762,867
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2019 Tour de PrimesFound 15 primes in the 2020 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (11,983,704)Cullen LLR Turquoise: Earned 5,000,000 credits (5,894,611)ESP LLR Jade: Earned 10,000,000 credits (10,390,853)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,882,966)PPS LLR Sapphire: Earned 20,000,000 credits (30,245,261)PSP LLR Jade: Earned 10,000,000 credits (10,509,062)SoB LLR Ruby: Earned 2,000,000 credits (2,445,976)SR5 LLR Jade: Earned 10,000,000 credits (12,866,436)SGS LLR Jade: Earned 10,000,000 credits (10,552,224)TRP LLR Jade: Earned 10,000,000 credits (16,438,861)Woodall LLR Turquoise: Earned 5,000,000 credits (5,152,091)321 Sieve Jade: Earned 10,000,000 credits (15,974,108)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)PPS Sieve Double Silver: Earned 200,000,000 credits (261,023,272)TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)AP 26/27 Emerald: Earned 50,000,000 credits (85,808,632)GFN Double Silver: Earned 200,000,000 credits (303,068,714)PSA Double Gold: Earned 500,000,000 credits (666,025,256)
Message 120182 - Posted: 28 Aug 2018 | 1:08:09 UTC

1 more day of PPS multi-threaded LLR going with one sieve running for GFN18 then I will turn off the sieve and run a day of PPS multi-threaded LLR and see how it compares time wise.

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Joined: 14 Sep 12
Posts: 591
ID: 172547
Credit: 1,456,388,683
RAC: 2,762,867
Discovered 4 mega primesEliminated 1 conjecture "k"Discovered 1 AP26Found 1 prime in the 2019 Tour de PrimesFound 15 primes in the 2020 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (11,983,704)Cullen LLR Turquoise: Earned 5,000,000 credits (5,894,611)ESP LLR Jade: Earned 10,000,000 credits (10,390,853)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,882,966)PPS LLR Sapphire: Earned 20,000,000 credits (30,245,261)PSP LLR Jade: Earned 10,000,000 credits (10,509,062)SoB LLR Ruby: Earned 2,000,000 credits (2,445,976)SR5 LLR Jade: Earned 10,000,000 credits (12,866,436)SGS LLR Jade: Earned 10,000,000 credits (10,552,224)TRP LLR Jade: Earned 10,000,000 credits (16,438,861)Woodall LLR Turquoise: Earned 5,000,000 credits (5,152,091)321 Sieve Jade: Earned 10,000,000 credits (15,974,108)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)PPS Sieve Double Silver: Earned 200,000,000 credits (261,023,272)TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)AP 26/27 Emerald: Earned 50,000,000 credits (85,808,632)GFN Double Silver: Earned 200,000,000 credits (303,068,714)PSA Double Gold: Earned 500,000,000 credits (666,025,256)
Message 120278 - Posted: 2 Sep 2018 | 21:06:16 UTC

Well I found I couldn't run them at B9 for long, kept freezing. So now I have them running at B8, about 1.0-1.1P/day per task times 2 tasks. Not very impressive, but it's something. I stopped running PPS LLR in exchange for ESP, but I still would like to run a comparison on how the sieving affects CPU LLR tasks.

Using the W1 parameter in the command line greatly reduces the CPU usage. Still it's sure no powerhouse at 2.2P/day total :)

Message boards : Sieving : OpenCL Intel Graphics Sieving

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