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Message boards : Problems and Help : AP27 Computation error - OpenCL Error, Code: -4

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Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105190 - Posted: 21 Feb 2017 | 8:44:25 UTC

I've just noticed today that all AP27 tasks run on my secondary GPU in my computer (GTX 960) fail with a computation error. The card runs Genefer15 fine though..

Any idea as to why and how to fix this issue?

Iain BethuneProject donor
Honorary cruncher
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Posts: 1588
ID: 34775
Credit: 194,056,043
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321 LLR Gold: Earned 500,000 credits (597,175)Cullen LLR Amethyst: Earned 1,000,000 credits (1,355,381)ESP LLR Turquoise: Earned 5,000,000 credits (5,048,594)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,564,412)PPS LLR Amethyst: Earned 1,000,000 credits (1,025,115)PSP LLR Sapphire: Earned 20,000,000 credits (28,367,849)SoB LLR Jade: Earned 10,000,000 credits (16,215,329)SR5 LLR Turquoise: Earned 5,000,000 credits (5,189,992)SGS LLR Amethyst: Earned 1,000,000 credits (1,244,067)TRP LLR Turquoise: Earned 5,000,000 credits (5,169,405)Woodall LLR Amethyst: Earned 1,000,000 credits (1,070,956)321 Sieve Bronze: Earned 10,000 credits (20,003)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (200,371)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (11,645,025)PPS Sieve Turquoise: Earned 5,000,000 credits (7,536,532)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,017,144)TRP Sieve (suspended) Gold: Earned 500,000 credits (554,946)AP 26/27 Ruby: Earned 2,000,000 credits (3,577,848)GFN Emerald: Earned 50,000,000 credits (97,047,976)PSA Ruby: Earned 2,000,000 credits (4,606,694)
Message 105191 - Posted: 21 Feb 2017 | 10:17:27 UTC - in response to Message 105190.

Hi,

That error code corresponds to "CL_MEM_OBJECT_ALLOCATION_FAILURE" i.e. memory could not be allocated on the GPU, for some reason. Have you ever been able to run AP27 tasks on the GTX 960?

- Iain
____________
Twitter: IainBethune
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3073428256125*2^1290000-1 is Prime!

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105230 - Posted: 22 Feb 2017 | 8:55:46 UTC - in response to Message 105191.

When the 960 was the only GPU in the system, AP27 tasks worked fine

Profile DaveProject donor
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Joined: 13 Feb 12
Posts: 2767
ID: 130544
Credit: 919,308,248
RAC: 19,498
Found 2 primes in the 2018 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (6,042,688)Cullen LLR Turquoise: Earned 5,000,000 credits (5,005,909)ESP LLR Turquoise: Earned 5,000,000 credits (5,303,526)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,202,873)PPS LLR Turquoise: Earned 5,000,000 credits (5,900,040)PSP LLR Turquoise: Earned 5,000,000 credits (5,513,728)SoB LLR Turquoise: Earned 5,000,000 credits (8,851,996)SR5 LLR Turquoise: Earned 5,000,000 credits (5,199,189)SGS LLR Turquoise: Earned 5,000,000 credits (5,100,018)TRP LLR Turquoise: Earned 5,000,000 credits (5,405,027)Woodall LLR Turquoise: Earned 5,000,000 credits (5,124,820)321 Sieve Turquoise: Earned 5,000,000 credits (6,142,762)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (268,250)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,502)PPS Sieve Double Silver: Earned 200,000,000 credits (306,761,000)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,133)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,970)AP 26/27 Double Bronze: Earned 100,000,000 credits (180,152,037)GFN Double Bronze: Earned 100,000,000 credits (133,333,389)PSA Double Silver: Earned 200,000,000 credits (200,000,001)
Message 105231 - Posted: 22 Feb 2017 | 9:30:17 UTC

Is the 960 not getting enough airflow? Is there a gap of at least 1 slot between the cards? Have you tried swapping the cards between slots?

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105232 - Posted: 22 Feb 2017 | 9:41:00 UTC - in response to Message 105231.

The 960 is adequately cooled with a custom fan curve, the temperatures are not bad, never exceeding 75 degrees (Celsius) and can run pretty much any other work I have tried, other than AP27.

I doubt switching slots would help and then, that I cannot do: all the other PCI-E slots are used by the main graphics card and a HBA.
I'll see if I can free up a test bench sometime soon and see if using it alone on another computer works.

Van ZimmermanProject donor
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Credit: 6,315,554,899
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Discovered the World's First GFN-20 prime!!!Discovered 2 mega primesFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Sapphire: Earned 20,000,000 credits (20,089,185)Cullen LLR Sapphire: Earned 20,000,000 credits (21,197,588)ESP LLR Sapphire: Earned 20,000,000 credits (20,089,407)Generalized Cullen/Woodall LLR Sapphire: Earned 20,000,000 credits (21,873,609)PPS LLR Sapphire: Earned 20,000,000 credits (21,918,476)PSP LLR Sapphire: Earned 20,000,000 credits (20,117,197)SoB LLR Sapphire: Earned 20,000,000 credits (26,779,370)SR5 LLR Sapphire: Earned 20,000,000 credits (20,278,667)SGS LLR Sapphire: Earned 20,000,000 credits (20,055,153)TRP LLR Sapphire: Earned 20,000,000 credits (20,619,871)Woodall LLR Sapphire: Earned 20,000,000 credits (20,394,541)321 Sieve Sapphire: Earned 20,000,000 credits (28,148,632)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,373,251)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,051,222,753)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,189,695)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,102,079)AP 26/27 Emerald: Earned 50,000,000 credits (60,248,786)GFN Double Ruby: Earned 2,000,000,000 credits (4,703,540,875)PSA Double Bronze: Earned 100,000,000 credits (198,313,575)
Message 105233 - Posted: 22 Feb 2017 | 10:37:40 UTC
Last modified: 22 Feb 2017 | 10:49:43 UTC

[Edit]

Are you able to monitor memory usage on the 960? while it is executing/trying to launch an AP27?

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105234 - Posted: 22 Feb 2017 | 11:40:41 UTC - in response to Message 105233.
Last modified: 22 Feb 2017 | 11:44:22 UTC

When AP27 *was* trying to launch, video memory usage on the 960 sits around 31MB out of 2048MB according to RivaTuner statistics server (Through MSI Afterburner) and 1MB out of 2048MB according to GPU-Z.

I have since changed preferences so that this system does not run AP27 anymore, I will have to wait until the current task's completion to confirm (the 960 is currently running Genefer 21 3.13 (OCLcudaGFN) with 23 hours remaining..)

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105284 - Posted: 23 Feb 2017 | 8:13:03 UTC - in response to Message 105234.

Since I left AP27s back on the 960 yesterday, I've seen some success from the tasks weirdly enough, even though I have changed no settings/made no modifications to my system...

https://www.primegrid.com/result.php?resultid=781118877

Profile DaveProject donor
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Joined: 13 Feb 12
Posts: 2767
ID: 130544
Credit: 919,308,248
RAC: 19,498
Found 2 primes in the 2018 Tour de PrimesFound 1 prime in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (6,042,688)Cullen LLR Turquoise: Earned 5,000,000 credits (5,005,909)ESP LLR Turquoise: Earned 5,000,000 credits (5,303,526)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,202,873)PPS LLR Turquoise: Earned 5,000,000 credits (5,900,040)PSP LLR Turquoise: Earned 5,000,000 credits (5,513,728)SoB LLR Turquoise: Earned 5,000,000 credits (8,851,996)SR5 LLR Turquoise: Earned 5,000,000 credits (5,199,189)SGS LLR Turquoise: Earned 5,000,000 credits (5,100,018)TRP LLR Turquoise: Earned 5,000,000 credits (5,405,027)Woodall LLR Turquoise: Earned 5,000,000 credits (5,124,820)321 Sieve Turquoise: Earned 5,000,000 credits (6,142,762)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (268,250)Generalized Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,502)PPS Sieve Double Silver: Earned 200,000,000 credits (306,761,000)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,133)TRP Sieve (suspended) Jade: Earned 10,000,000 credits (10,000,970)AP 26/27 Double Bronze: Earned 100,000,000 credits (180,152,037)GFN Double Bronze: Earned 100,000,000 credits (133,333,389)PSA Double Silver: Earned 200,000,000 credits (200,000,001)
Message 105286 - Posted: 23 Feb 2017 | 9:35:14 UTC

You might want to keep a CPU core free to help feed the GPUs. AP seems easy to trip-up' in my experience.

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105290 - Posted: 23 Feb 2017 | 11:46:16 UTC - in response to Message 105286.

It's weird, because it was when I ran exclusively AP27 (and no CPU tasks running whatsoever) that I kept getting computation error.

Now that I am running Woodall on six of my eight cores along AP27, AP27 seem to work fine.

Will update if I do get more errors.

Dao Heng
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Joined: 24 Sep 13
Posts: 10
ID: 257315
Credit: 63,241,339
RAC: 0
321 LLR Gold: Earned 500,000 credits (815,723)Cullen LLR Silver: Earned 100,000 credits (430,745)ESP LLR Gold: Earned 500,000 credits (642,080)PPS LLR Silver: Earned 100,000 credits (257,132)PSP LLR Silver: Earned 100,000 credits (495,719)SoB LLR Amethyst: Earned 1,000,000 credits (1,990,613)SR5 LLR Bronze: Earned 10,000 credits (65,453)SGS LLR Bronze: Earned 10,000 credits (61,826)TRP LLR Silver: Earned 100,000 credits (125,895)Woodall LLR Gold: Earned 500,000 credits (808,900)Generalized Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (759,760)PPS Sieve Ruby: Earned 2,000,000 credits (2,538,363)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,457,082)AP 26/27 Ruby: Earned 2,000,000 credits (2,704,767)GFN Sapphire: Earned 20,000,000 credits (29,084,066)PSA Sapphire: Earned 20,000,000 credits (20,998,230)
Message 105385 - Posted: 26 Feb 2017 | 10:19:37 UTC - in response to Message 105290.

Alright. Issue no longer exists after having done nothing in particular.

Message boards : Problems and Help : AP27 Computation error - OpenCL Error, Code: -4

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