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Message boards : Sierpinski/Riesel Base 5 Problem : Optimal CPU count?

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Profile Jordan Romaidis
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Joined: 11 May 17
Posts: 145
ID: 880615
Credit: 397,540,832
RAC: 1,294,570
Discovered 2 mega primesEliminated 1 conjecture "k"Found 1 prime in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de Primes321 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 Ruby: Earned 2,000,000 credits (3,128,825)PPS LLR Sapphire: Earned 20,000,000 credits (33,942,071)PSP LLR Bronze: Earned 10,000 credits (23,710)SoB LLR Sapphire: Earned 20,000,000 credits (39,787,567)SR5 LLR Jade: Earned 10,000,000 credits (16,524,382)SGS LLR Turquoise: Earned 5,000,000 credits (8,407,788)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 Sapphire: Earned 20,000,000 credits (20,606,749)PPS Sieve Sapphire: Earned 20,000,000 credits (23,296,981)AP 26/27 Emerald: Earned 50,000,000 credits (62,444,135)GFN Double Bronze: Earned 100,000,000 credits (112,727,700)PSA Emerald: Earned 50,000,000 credits (52,891,089)
Message 121070 - Posted: 13 Oct 2018 | 21:17:45 UTC

Has anyone done experimenting with 4+ cores assigned to a single WU? Does SR5 have a thread limit that won't help crunching? Trying to crank these out as fast as possible.

Profile Rafael
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321 LLR Turquoise: Earned 5,000,000 credits (5,065,657)Cullen LLR Turquoise: Earned 5,000,000 credits (5,027,789)ESP LLR Turquoise: Earned 5,000,000 credits (5,053,244)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,036,673)PPS LLR Turquoise: Earned 5,000,000 credits (5,870,467)PSP LLR Turquoise: Earned 5,000,000 credits (5,092,781)SoB LLR Turquoise: Earned 5,000,000 credits (5,521,831)SR5 LLR Turquoise: Earned 5,000,000 credits (5,216,594)SGS LLR Turquoise: Earned 5,000,000 credits (5,068,261)TRP LLR Turquoise: Earned 5,000,000 credits (5,007,966)Woodall LLR Turquoise: Earned 5,000,000 credits (5,006,951)321 Sieve Silver: Earned 100,000 credits (489,128)Generalized Cullen/Woodall Sieve 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 (10,079,199)GFN Sapphire: Earned 20,000,000 credits (24,893,205)PSA Double Bronze: Earned 100,000,000 credits (170,758,062)
Message 121072 - Posted: 13 Oct 2018 | 21:37:18 UTC - in response to Message 121070.

Has anyone done experimenting with 4+ cores assigned to a single WU? Does SR5 have a thread limit that won't help crunching? Trying to crank these out as fast as possible.

As with most things in life... it depends, mainly on your processador architecture, core count, RAM and what you do with your PC.

For instance, take my 4c Haswell. It has relatively low clocks (3.5ghz) and Dual channel, Dual rank 2133mhz RAM, but I found running 4C would normally be the best... but because it is also my daily driver, regular usage steals cycles and it ends up being SLOWER than running with 3C only, even if it's faster to run with 4c on a vaccum.

So beest advice is to test for yourself. Turn of Hyperthreading (if you can) and run a couple benchmarks, Prime95 has an intuitive tool for helping you easily figure out performance numbers.

KeithProject donor
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Discovered 1 mega primeFound 2 primes in the 2018 Tour de PrimesFound 3 primes in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,438,872)Cullen LLR Turquoise: Earned 5,000,000 credits (5,009,911)ESP LLR Ruby: Earned 2,000,000 credits (4,559,273)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,002,124)PPS LLR Turquoise: Earned 5,000,000 credits (5,015,407)PSP LLR Ruby: Earned 2,000,000 credits (2,436,657)SoB LLR Turquoise: Earned 5,000,000 credits (6,751,021)SR5 LLR Turquoise: Earned 5,000,000 credits (5,014,727)SGS LLR Turquoise: Earned 5,000,000 credits (5,009,588)TRP LLR Turquoise: Earned 5,000,000 credits (5,759,074)Woodall LLR Turquoise: Earned 5,000,000 credits (5,053,050)321 Sieve Turquoise: Earned 5,000,000 credits (5,002,887)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,004,494)PPS Sieve Double Bronze: Earned 100,000,000 credits (100,111,958)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,002,980)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,010,755)AP 26/27 Emerald: Earned 50,000,000 credits (58,445,608)GFN Emerald: Earned 50,000,000 credits (71,298,177)
Message 121074 - Posted: 14 Oct 2018 | 2:44:36 UTC

As Rafael says, test with various core counts and work unit counts.
And "fast" here can be described in two ways. One is throughput, or how many units you can do in a set amount of time. Two is fastest unit. They are not always the same. So it is best to test to strike the balance however you want it.
Also, there is no limit of how many cores you can throw at a single task. The more cores the faster the task, but you might get more tasks done by running more than one task at a time within the same time span.
____________
My Primes
Badge Score: 4*2 + 5*3 + 6*10 + 9*2 + 10*1 = 111

Profile mikey
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Credit: 457,811,956
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321 LLR Gold: Earned 500,000 credits (511,386)Cullen LLR Gold: Earned 500,000 credits (510,818)ESP LLR Gold: Earned 500,000 credits (925,457)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (564,210)PPS LLR Turquoise: Earned 5,000,000 credits (5,086,073)PSP LLR Gold: Earned 500,000 credits (686,232)SoB LLR Gold: Earned 500,000 credits (785,805)SR5 LLR Gold: Earned 500,000 credits (994,916)SGS LLR Turquoise: Earned 5,000,000 credits (5,095,282)TRP LLR Gold: Earned 500,000 credits (512,571)Woodall LLR Gold: Earned 500,000 credits (673,276)321 Sieve Ruby: Earned 2,000,000 credits (2,006,315)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (944,431)Generalized Cullen/Woodall Sieve Sapphire: Earned 20,000,000 credits (20,813,253)PPS Sieve Double Silver: Earned 200,000,000 credits (336,874,224)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,446,797)AP 26/27 Sapphire: Earned 20,000,000 credits (33,132,385)GFN Sapphire: Earned 20,000,000 credits (24,806,170)PSA Sapphire: Earned 20,000,000 credits (20,457,430)
Message 132049 - Posted: 14 Aug 2019 | 20:21:35 UTC - in response to Message 121070.
Last modified: 14 Aug 2019 | 20:22:38 UTC

My AMD 1920X was doing them using 4 cores per wu, 5 wu at a time in about 14 hours for each wu. I switched to 5 cores per wu, 4 wu at a time and the time is closer to 4 hours for each wu. I have 32gb of ddr4 quad channel ram in the pc.

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Message boards : Sierpinski/Riesel Base 5 Problem : Optimal CPU count?

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