Multiple GPU systems

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Dad

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Joined: 28 Feb 18
Posts: 284
ID: 984171
Credit: 182,080,291
RAC: 0

321 LLR Gold: Earned 500,000 credits (503,707)

Cullen LLR Amethyst: Earned 1,000,000 credits (1,001,529)

ESP LLR Gold: Earned 500,000 credits (502,172)

Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,028,459)

PPS LLR Turquoise: Earned 5,000,000 credits (7,989,101)

PSP LLR Gold: Earned 500,000 credits (566,759)

SoB LLR Ruby: Earned 2,000,000 credits (2,047,598)

SR5 LLR Amethyst: Earned 1,000,000 credits (1,014,245)

SGS LLR Amethyst: Earned 1,000,000 credits (1,343,649)

TRP LLR Amethyst: Earned 1,000,000 credits (1,279,172)

Woodall LLR Amethyst: Earned 1,000,000 credits (1,017,620)

321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,005,090)

Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (32,970,234)

PPS Sieve Sapphire: Earned 20,000,000 credits (31,771,675)

AP 26/27 Ruby: Earned 2,000,000 credits (2,179,177)

GFN Emerald: Earned 50,000,000 credits (87,116,853)

PSA Turquoise: Earned 5,000,000 credits (8,743,250)

Hi All,

I'm about to 'dip my toe' in the Manual Sieving waters and have the following question(s);

On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?
On a multi GPU system, does Sieving 'automatically' use both GPUs?
On a multi GPU system where one GPU is much better than the other, does Sieving care?

Thanx

Dad
____________

Tonight's lucky numbers are

555*2^3563328+1 (PPS-MEGA)

and

58523466^131072+1 (GFN-17 MEGA)

ID: 126848 |

Rafael
Volunteer tester
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Joined: 22 Oct 14
Posts: 909
ID: 370496
Credit: 531,786,588
RAC: 422,920

Found 1 prime in the 2023 Tour de Primes

Found 1 mega prime in the 2023 Tour de Primes

Found 1 prime in the 2023 Tour de Primes Mountain Stage

Found 1 mega prime in the 2023 Tour de Primes Mountain Stage

321 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 (10,094,995)

PSP LLR Jade: Earned 10,000,000 credits (10,049,767)

SoB LLR Sapphire: Earned 20,000,000 credits (42,816,304)

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)

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 (82,780,072)

WW Emerald: Earned 50,000,000 credits (50,712,000)

PSA Double Bronze: Earned 100,000,000 credits (170,761,999)

On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?

Yes. The sieve app runs on a single GPU at a time, and you can tell which one to use. Meanwhile in BOINC, you can tell it to ignore a given device so that it won't use it.

On a multi GPU system, does Sieving 'automatically' use both GPUs?

See above. If you want to run on more than one GPU at a time, you'll have to launch the app individually for each of them.

On a multi GPU system where one GPU is much better than the other, does Sieving care?

The app doesn't care for how good a GPU you use, so long as it supports the necessary features. Whether it's worth to sieve or use the card for something else, that's up to the user to decide.

But generally speaking, I find that Nvidia GPUs are better at sieving and AMD's are better at crunching.

ID: 126852 |

Penguin

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Joined: 14 Sep 12
Posts: 722
ID: 172547
Credit: 3,900,676,153
RAC: 8,034,169

Found 1 prime in the 2019 Tour de Primes

Found 15 primes in the 2020 Tour de Primes

Found 15 primes in the 2021 Tour de Primes

Found 2 primes in the 2021 Tour de Primes Mountain Stage

Found 8 primes in the 2022 Tour de Primes

Found 8 primes in the 2023 Tour de Primes

321 LLR Jade: Earned 10,000,000 credits (16,184,356)

Cullen LLR Jade: Earned 10,000,000 credits (12,149,015)

ESP LLR Jade: Earned 10,000,000 credits (15,204,046)

Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (6,457,830)

PPS LLR Emerald: Earned 50,000,000 credits (92,393,100)

PSP LLR Sapphire: Earned 20,000,000 credits (32,640,213)

SoB LLR Ruby: Earned 2,000,000 credits (2,753,793)

SR5 LLR Double Bronze: Earned 100,000,000 credits (108,241,389)

SGS LLR Sapphire: Earned 20,000,000 credits (32,915,235)

TRP LLR Sapphire: Earned 20,000,000 credits (27,849,537)

Woodall LLR Jade: Earned 10,000,000 credits (10,813,070)

321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (23,909,932)

Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,833)

PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,273,514,809)

TRP Sieve (suspended) Silver: Earned 100,000 credits (110,630)

AP 26/27 Double Bronze: Earned 100,000,000 credits (160,600,089)

GFN Double Gold: Earned 500,000,000 credits (853,469,599)

WW Double Gold: Earned 500,000,000 credits (559,612,000)

PSA Double Gold: Earned 500,000,000 credits (666,899,755)

Hi All,

I'm about to 'dip my toe' in the Manual Sieving waters and have the following question(s);

On a multi GPU system, can I restrict Sieving to one GPU and let BOINC have the other?
On a multi GPU system, does Sieving 'automatically' use both GPUs?
On a multi GPU system where one GPU is much better than the other, does Sieving care?

Thanx

Dad

When you run the sieve app you can specify D0 or D1 to use device 0 or device 1 each being your separate GPUs. This goes at the end of your command line. W1 reduces cpu usage and Bx is the block size. Change x to 8-13 to see if it improves performance. Default is B7.

ID: 126995 |

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