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Message boards : Seventeen or Bust : Annoying error

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Message 21615 - Posted: 7 Mar 2010 | 18:47:11 UTC
Last modified: 7 Mar 2010 | 18:47:58 UTC

Hey all,

It seems like i had a WU that errored out but BOINC didn't remove the WU from my worklist. Now it was finally completed, i saw this in my messages windows:

7/03/2010 19:43:33 PrimeGrid Message from server: Completed result llr_sob_44330560_1 refused: result already reported as error

That's alot of wasted system resources :s
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321 LLR Bronze: Earned 10,000 credits (60,082)Cullen LLR Bronze: Earned 10,000 credits (15,423)ESP LLR Gold: Earned 500,000 credits (519,856)PPS LLR Gold: Earned 500,000 credits (526,520)PSP LLR Bronze: Earned 10,000 credits (24,206)SoB LLR Bronze: Earned 10,000 credits (14,422)SR5 LLR Gold: Earned 500,000 credits (518,356)SGS LLR Silver: Earned 100,000 credits (102,655)TPS LLR (retired) Bronze: Earned 10,000 credits (31,486)TRP LLR Bronze: Earned 10,000 credits (29,696)Woodall LLR Amethyst: Earned 1,000,000 credits (1,039,198)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,020,771)Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (8,228,565)PPS Sieve Emerald: Earned 50,000,000 credits (84,579,993)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,070,654)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,211,586)AP 26/27 Silver: Earned 100,000 credits (115,596)GFN Silver: Earned 100,000 credits (200,628)PSA Amethyst: Earned 1,000,000 credits (1,184,000)
Message 21619 - Posted: 7 Mar 2010 | 23:22:14 UTC

The WU on your computer for whatever reason produced an error. Your computer submitted this WU to PrimeGrid telling it that your result was an error. The server acknowledged this but your client never received confirmation from the server of this event. The next time your client connects, it attempts to report that this WU was an error once again. The server sees that you have already reported this and tells the client the message you got. In short, you only should have processed this WU once and received an error once. You did not do it twice and get an error twice. SoB requires stable hardware in order not to produce erroneous WUs.
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Message 21643 - Posted: 8 Mar 2010 | 23:17:31 UTC

I'm running a stock computer with a core i7. How's that instable? I didn't get any other errors before. And i'm pretty sure i saw the SoB wu completing. It got to 100%, then the error message came.
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321 LLR Bronze: Earned 10,000 credits (60,082)Cullen LLR Bronze: Earned 10,000 credits (15,423)ESP LLR Gold: Earned 500,000 credits (519,856)PPS LLR Gold: Earned 500,000 credits (526,520)PSP LLR Bronze: Earned 10,000 credits (24,206)SoB LLR Bronze: Earned 10,000 credits (14,422)SR5 LLR Gold: Earned 500,000 credits (518,356)SGS LLR Silver: Earned 100,000 credits (102,655)TPS LLR (retired) Bronze: Earned 10,000 credits (31,486)TRP LLR Bronze: Earned 10,000 credits (29,696)Woodall LLR Amethyst: Earned 1,000,000 credits (1,039,198)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,020,771)Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (8,228,565)PPS Sieve Emerald: Earned 50,000,000 credits (84,579,993)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,070,654)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,211,586)AP 26/27 Silver: Earned 100,000 credits (115,596)GFN Silver: Earned 100,000 credits (200,628)PSA Amethyst: Earned 1,000,000 credits (1,184,000)
Message 21670 - Posted: 9 Mar 2010 | 17:34:21 UTC

From looking at your WUs, I see that you had 2 SoB WUs that resulted in an error during computation. You never actually finished the computation but once the computation error occurs I believe the WU reads as 100% done with the words computation error next to it. Although your computer is stock, it could still be producing too much heat. For instance, my Q9550 is stock and still produces too much heat probably because of cheap thermal paste, heatsink, and cooler. A power supply not providing a stable voltage can result in errors as well. Any improper shutdown(power outage, just pressing the reset button, or an overheating induced reboot) of your computer may result in a computation error as well. The SoB application is the longest and most intense WU available at PrimeGrid and even the smallest error can mess up your computation.
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Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 2 mega primesFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de PrimesFound 2 primes in the 2022 Tour de PrimesFound 1 mega prime in the 2022 Tour de PrimesFound 1 prime in the 2022 Tour de Primes Mountain StageFound 1 prime in the 2023 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (6,949,793)Cullen LLR Turquoise: Earned 5,000,000 credits (5,513,946)ESP LLR Turquoise: Earned 5,000,000 credits (7,150,009)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (24,049,916)PSP LLR Jade: Earned 10,000,000 credits (11,203,327)SoB LLR Sapphire: Earned 20,000,000 credits (36,601,737)SR5 LLR Sapphire: Earned 20,000,000 credits (22,821,256)SGS LLR Turquoise: Earned 5,000,000 credits (6,394,971)TRP LLR Turquoise: Earned 5,000,000 credits (6,308,522)Woodall LLR Turquoise: Earned 5,000,000 credits (6,390,624)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve Emerald: Earned 50,000,000 credits (51,764,198)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,888,492)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Sapphire: Earned 20,000,000 credits (23,650,224)GFN Double Bronze: Earned 100,000,000 credits (120,616,519)WW (retired) Emerald: Earned 50,000,000 credits (88,580,000)PSA Jade: Earned 10,000,000 credits (13,196,884)
Message 21671 - Posted: 9 Mar 2010 | 17:49:55 UTC - in response to Message 21670.

If you're getting computation errors that can't be explained away, there's several things you can do to isolate the cause.

Sometimes the cause is operational: i.e., you start playing a complex game which ends up adversely affecting the resources available, which causes the WU to error out due to failed memory allocation requests. Usually, however, it's fairly obvious when that happens.

Or there could be a real probelm with your computer. Even "stock" computers degrade over time. A great example is simple dust. Given enough time, dust will clog the CPU heatsink, rendering the CPU fan much less effective than it was originally. The resulting thermal problems will cause a variety of hard to diagnose problems.

So, things I would suggest you try:

1) Open up the computer and clean out any dust with either a vacuum or compressed air. One computer in my kids' room actually stopped working because of this. (Shame on me.) In my bedroom, I've found that talcum particles (thanks, wife!) tend to cause more rapid dust buildup in my computer now that it's in the bedroom than when it was in the basement. The result was less efficient cooling, which caused the fans to run faster, which caused the wife to complain, which caused me to clean out the computer. That's what we call in engineering circles "closed loop". :)

2) Run a memory diagnostic on your system. I'll leave it to someone else to suggest a good one. Sometimes a DIMM just goes bad. (I wish PCs still used parity memory. ::sigh::)

3) Run CoreTemp or some other CPU temperature monitoring program so you have an idea of how hot your system is running. Stock systems usually have relatively poor CPU cooling, and when you run them 24/7 at 100%, through in some adverse environmental conditions (warm room, restricted ventilation, dusty, etc.), and you might be looking at a computer that's just running too warm. It helps a lot to know how hot it actually is.
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Message 21674 - Posted: 9 Mar 2010 | 20:26:39 UTC

1) My PC is pretty new and i don't have the stock cooler. The CPU get's about 40°C at full load, which isn't hot at all?

2) I just did a memcheck, it seems to work fine.

Also, none of the other primegrid wu's errored and they all get validated.

I gradually saw SoB complete the test. The last value i saw was 97%. The results page says that the error was reported 21 Feb. How can the WU still be in my jobs list for 14 days? I'm telling you.. It continued working, finished but i didn't get credit for it because somehow there was an error reported already.
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Message boards : Seventeen or Bust : Annoying error

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