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Message boards : Proth Prime Search : PPS cuda Sieve...Why so much credit?

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numbermaniac
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Joined: 28 Mar 14
Posts: 64
ID: 305955
Credit: 2,233,716
RAC: 2,041
321 LLR Bronze: Earned 10,000 credits (11,818)PPS LLR Silver: Earned 100,000 credits (269,821)SR5 LLR Bronze: Earned 10,000 credits (34,115)SGS LLR Bronze: Earned 10,000 credits (31,612)Generalized Cullen/Woodall Sieve Bronze: Earned 10,000 credits (58,978)PPS Sieve Amethyst: Earned 1,000,000 credits (1,560,773)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (34,269)TRP Sieve Bronze: Earned 10,000 credits (32,679)AP 26/27 Bronze: Earned 10,000 credits (12,129)GFN Bronze: Earned 10,000 credits (65,199)PSA Silver: Earned 100,000 credits (122,325)
Message 78304 - Posted: 25 Jul 2014 | 8:33:36 UTC

I'm confused as to why the Nvidia cuda PPS Sieve is fairly short but gives so much credit: it seems to be 3,371 per task! May I ask exactly why this is?

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Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 8036
ID: 53948
Credit: 76,679,258
RAC: 63,052
321 LLR Amethyst: Earned 1,000,000 credits (1,006,834)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Amethyst: Earned 1,000,000 credits (1,179,211)PPS LLR Amethyst: Earned 1,000,000 credits (1,062,186)PSP LLR Amethyst: Earned 1,000,000 credits (1,091,553)SoB LLR Amethyst: Earned 1,000,000 credits (1,088,962)SR5 LLR Turquoise: Earned 5,000,000 credits (5,061,145)SGS LLR Amethyst: Earned 1,000,000 credits (1,025,240)TRP LLR Amethyst: Earned 1,000,000 credits (1,005,510)Woodall LLR Amethyst: Earned 1,000,000 credits (1,077,056)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Gold: Earned 500,000 credits (561,979)PPS Sieve Jade: Earned 10,000,000 credits (16,122,895)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Ruby: Earned 2,000,000 credits (4,684,511)GFN Sapphire: Earned 20,000,000 credits (23,798,867)PSA Turquoise: Earned 5,000,000 credits (9,300,142)
Message 78306 - Posted: 25 Jul 2014 | 11:17:55 UTC - in response to Message 78304.

I'm confused as to why the Nvidia cuda PPS Sieve is fairly short but gives so much credit: it seems to be 3,371 per task! May I ask exactly why this is?


The GPU program is very efficient and utilizes the GPU very well. That's why it runs so quickly. The task itself is actually quite a large task.

If you were to run the very same task on a cpu core you wouldn't think it's a very short task. You might even be asking why its credit is so low and is only 3,371.

Were you to read through the forums, you would see that we lowered the credit on this sieve a couple of years ago, which was widely hailed throughout the user community as a fantastic move. (Okay, maybe not so much. "Angry mob with pitchforks" might be a better description.)

Bottom line is we're happy with where the credit is right now and think it's the correct level. Understand that there's no "perfect" credit formula -- but there are certainly ways of assigning credit that are far worse that what we use.
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Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

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Profile Gary Craig
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Joined: 30 Dec 09
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Credit: 724,993,547
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321 LLR Ruby: Earned 2,000,000 credits (2,076,457)Cullen LLR Ruby: Earned 2,000,000 credits (2,277,342)ESP LLR Ruby: Earned 2,000,000 credits (3,085,940)PPS LLR Turquoise: Earned 5,000,000 credits (5,222,910)PSP LLR Ruby: Earned 2,000,000 credits (2,185,984)SoB LLR Ruby: Earned 2,000,000 credits (2,194,447)SR5 LLR Ruby: Earned 2,000,000 credits (3,573,827)SGS LLR Ruby: Earned 2,000,000 credits (2,378,148)TRP LLR Turquoise: Earned 5,000,000 credits (7,479,560)Woodall LLR Ruby: Earned 2,000,000 credits (2,100,141)321 Sieve (suspended) Silver: Earned 100,000 credits (200,818)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (59,788,598)PPS Sieve Double Silver: Earned 200,000,000 credits (443,240,691)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,130,821)TRP Sieve Turquoise: Earned 5,000,000 credits (9,634,390)AP 26/27 Silver: Earned 100,000 credits (202,746)GFN Double Bronze: Earned 100,000,000 credits (106,842,054)PSA Emerald: Earned 50,000,000 credits (62,378,755)
Message 78331 - Posted: 26 Jul 2014 | 19:52:24 UTC - in response to Message 78306.
Last modified: 26 Jul 2014 | 19:53:16 UTC

IIRC the credit we landed on (3371) was actually going to be something ever-so-slightly different (within 10 or so), but 3371 was suggested because it is prime. This is a good thing!

As for the "mob with pitchforks", yes, but there was also the biker gang hurling molotov cocktails and the orc army with the flaming battering ram. Yet, here we are :-)

--Gary
____________
"I am he as you are he as you are me and we are all together"

87*2^3496188+1 is prime! (1052460 digits)
4 is not prime! (1 digit)

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numbermaniac
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Joined: 28 Mar 14
Posts: 64
ID: 305955
Credit: 2,233,716
RAC: 2,041
321 LLR Bronze: Earned 10,000 credits (11,818)PPS LLR Silver: Earned 100,000 credits (269,821)SR5 LLR Bronze: Earned 10,000 credits (34,115)SGS LLR Bronze: Earned 10,000 credits (31,612)Generalized Cullen/Woodall Sieve Bronze: Earned 10,000 credits (58,978)PPS Sieve Amethyst: Earned 1,000,000 credits (1,560,773)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (34,269)TRP Sieve Bronze: Earned 10,000 credits (32,679)AP 26/27 Bronze: Earned 10,000 credits (12,129)GFN Bronze: Earned 10,000 credits (65,199)PSA Silver: Earned 100,000 credits (122,325)
Message 78353 - Posted: 27 Jul 2014 | 7:25:26 UTC

Lol...ok I get it. Thanks :)

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Message boards : Proth Prime Search : PPS cuda Sieve...Why so much credit?

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