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Message boards : Extended Sierpinski Problem : Change to PSP/SoB/ESP sieve validation criteria

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Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 13570
ID: 53948
Credit: 249,642,052
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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 1 mega primeFound 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 Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (3,624,591)ESP LLR Turquoise: Earned 5,000,000 credits (5,021,269)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (19,367,185)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,291,181)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,710,224)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)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 Jade: Earned 10,000,000 credits (10,118,303)WW Turquoise: Earned 5,000,000 credits (9,764,000)GFN Emerald: Earned 50,000,000 credits (77,821,281)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 78750 - Posted: 12 Aug 2014 | 23:41:20 UTC

We've made a change to the validation criteria for the PSP/SoB/ESP sieve.

Please see this post for details: http://www.primegrid.com/forum_thread.php?id=5797&nowrap=true#78748
____________
My lucky number is 75898524288+1

ID: 78750 | Report as offensive
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Joined: 1 Mar 14
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Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 1 prime in the 2021 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,011,570)Cullen LLR Jade: Earned 10,000,000 credits (10,009,374)ESP LLR Jade: Earned 10,000,000 credits (10,009,221)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,012,217)PPS LLR Jade: Earned 10,000,000 credits (16,229,784)PSP LLR Jade: Earned 10,000,000 credits (10,044,081)SoB LLR Jade: Earned 10,000,000 credits (10,064,750)SR5 LLR Jade: Earned 10,000,000 credits (10,002,051)SGS LLR Jade: Earned 10,000,000 credits (10,001,295)TRP LLR Jade: Earned 10,000,000 credits (10,002,411)Woodall LLR Jade: Earned 10,000,000 credits (10,013,921)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,004,228)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,047,667)PPS Sieve Sapphire: Earned 20,000,000 credits (20,866,490)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,043,271)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,015,177)AP 26/27 Sapphire: Earned 20,000,000 credits (20,045,194)WW Jade: Earned 10,000,000 credits (10,740,000)GFN Emerald: Earned 50,000,000 credits (55,353,805)PSA Double Silver: Earned 200,000,000 credits (200,301,443)
Message 79648 - Posted: 22 Sep 2014 | 11:04:03 UTC - in response to Message 78750.

We've made a change to the validation criteria for the PSP/SoB/ESP sieve.

Please see this post for details: http://www.primegrid.com/forum_thread.php?id=5797&nowrap=true#78748

Look like I've been hit by unknown Boinc glitch which caused false validator alarm:

http://www.primegrid.com/workunit.php?wuid=405596683 and http://www.primegrid.com/result.php?resultid=572879075

For some unknown reason, Boinc reported very small runtimes (less then validator limit). Really, execution time for this workunit, taken from full log, was 1536 seconds (summed from 4 pieces because Boinc is suspended by user activity on this PC) which exactly matches average execution times on this PC. Full task log (second link) shows that task went smoothly up to full 100%.

Numbers are wrong in the local job_log file too. It could be seen that workunit run on second core also reported wrong times but they fit within validator limits:

1411107418 ue 3094.838448 ct 1460.309800 fe 9238280000000 nm ESP_sieve_39190692_1 et 1471.347155 es 0
1411109489 ue 3094.838448 ct 568.530000 fe 9238280000000 nm ESP_sieve_39190983_2 et 574.119837 es 0
1411118140 ue 3094.838448 ct 1027.984200 fe 9238280000000 nm ESP_sieve_39191215_0 et 1063.230814 es 0
1411118924 ue 3094.838448 ct 1436.519600 fe 9238280000000 nm ESP_sieve_39191322_0 et 1457.844383 es 0

Unfortunately, I have no idea what could it be. No system errors or events near this time, just another working day. Let's call it another Boinc glitch. Lucky, this happened for me only once, although I had quite lot of sieving.

The full log which confirms that true task runtime was 07:04+12:34+02:30+03:28=25:36 (1536 seconds):
19-Sep-2014 09:40:52 [PrimeGrid] Starting task ESP_sieve_39190983_2 19-Sep-2014 09:40:54 [PrimeGrid] Started upload of ESP_sieve_39190532_2_0 19-Sep-2014 09:40:56 [PrimeGrid] Finished upload of ESP_sieve_39190532_2_0 19-Sep-2014 09:41:01 [PrimeGrid] Sending scheduler request: To report completed tasks. 19-Sep-2014 09:41:01 [PrimeGrid] Reporting 1 completed tasks 19-Sep-2014 09:41:01 [PrimeGrid] Requesting new tasks for CPU and intel_gpu 19-Sep-2014 09:41:03 [PrimeGrid] Scheduler request completed: got 1 new tasks 19-Sep-2014 09:41:05 [PrimeGrid] Started download of ESP_sieve_39191322_cmd 19-Sep-2014 09:41:07 [PrimeGrid] Finished download of ESP_sieve_39191322_cmd 19-Sep-2014 09:47:56 [---] Suspending computation - computer is in use 19-Sep-2014 09:47:56 [---] Suspending network activity - computer is in use 19-Sep-2014 10:13:37 [---] Resuming computation 19-Sep-2014 10:13:37 [---] Resuming network activity 19-Sep-2014 10:16:58 [PrimeGrid] Computation for task ESP_sieve_39190692_1 finished 19-Sep-2014 10:16:58 [PrimeGrid] Starting task ESP_sieve_39191215_0 19-Sep-2014 10:17:00 [PrimeGrid] Started upload of ESP_sieve_39190692_1_0 19-Sep-2014 10:17:02 [PrimeGrid] Finished upload of ESP_sieve_39190692_1_0 19-Sep-2014 10:17:02 [PrimeGrid] Sending scheduler request: To report completed tasks. 19-Sep-2014 10:17:02 [PrimeGrid] Reporting 1 completed tasks 19-Sep-2014 10:17:02 [PrimeGrid] Requesting new tasks for CPU and intel_gpu 19-Sep-2014 10:17:04 [PrimeGrid] Scheduler request completed: got 1 new tasks 19-Sep-2014 10:17:06 [PrimeGrid] Started download of ESP_sieve_39191720_cmd 19-Sep-2014 10:17:08 [PrimeGrid] Finished download of ESP_sieve_39191720_cmd 19-Sep-2014 10:26:11 [---] Suspending computation - computer is in use 19-Sep-2014 10:26:11 [---] Suspending network activity - computer is in use 19-Sep-2014 10:34:23 [---] Resuming computation 19-Sep-2014 10:34:23 [---] Resuming network activity 19-Sep-2014 10:36:53 [---] Suspending computation - computer is in use 19-Sep-2014 10:36:53 [---] Suspending network activity - computer is in use 19-Sep-2014 10:48:00 [---] Resuming computation 19-Sep-2014 10:48:00 [---] Resuming network activity 19-Sep-2014 10:51:28 [PrimeGrid] Computation for task ESP_sieve_39190983_2 finished

ID: 79648 | Report as offensive
Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 13570
ID: 53948
Credit: 249,642,052
RAC: 130,417
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 1 mega primeFound 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 Primes321 LLR Ruby: Earned 2,000,000 credits (2,822,730)Cullen LLR Ruby: Earned 2,000,000 credits (3,624,591)ESP LLR Turquoise: Earned 5,000,000 credits (5,021,269)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Jade: Earned 10,000,000 credits (19,367,185)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (34,291,181)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,710,224)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)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 Jade: Earned 10,000,000 credits (10,118,303)WW Turquoise: Earned 5,000,000 credits (9,764,000)GFN Emerald: Earned 50,000,000 credits (77,821,281)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 79651 - Posted: 22 Sep 2014 | 12:55:57 UTC - in response to Message 79648.

Noted. At first glance I'm not sure what we can do about that.

Based on the information you provided as well as some additional limited information we have on the server, one of two things happened:

1) For reasons unknown, amongst all the other correct tasks on that computer, this one task reported the time incorrectly, but otherwise ran correctly.

2) For reasons unknown, amongst all the other correct tasks on that computer, this one task failed for some reason and ran for a shorter period of time, but left no trace of this in the log.

The second possibility seems less likely, but in either case it's not at all obvious what the cause is or what we could do about it.

Thanks for bringing it to our attention.
____________
My lucky number is 75898524288+1

ID: 79651 | Report as offensive
stream
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Joined: 1 Mar 14
Posts: 858
ID: 301928
Credit: 503,817,766
RAC: 262,675
Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 1 prime in the 2021 Tour de Primes321 LLR Jade: Earned 10,000,000 credits (10,011,570)Cullen LLR Jade: Earned 10,000,000 credits (10,009,374)ESP LLR Jade: Earned 10,000,000 credits (10,009,221)Generalized Cullen/Woodall LLR Jade: Earned 10,000,000 credits (10,012,217)PPS LLR Jade: Earned 10,000,000 credits (16,229,784)PSP LLR Jade: Earned 10,000,000 credits (10,044,081)SoB LLR Jade: Earned 10,000,000 credits (10,064,750)SR5 LLR Jade: Earned 10,000,000 credits (10,002,051)SGS LLR Jade: Earned 10,000,000 credits (10,001,295)TRP LLR Jade: Earned 10,000,000 credits (10,002,411)Woodall LLR Jade: Earned 10,000,000 credits (10,013,921)321 Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,004,228)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,047,667)PPS Sieve Sapphire: Earned 20,000,000 credits (20,866,490)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,043,271)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,015,177)AP 26/27 Sapphire: Earned 20,000,000 credits (20,045,194)WW Jade: Earned 10,000,000 credits (10,740,000)GFN Emerald: Earned 50,000,000 credits (55,353,805)PSA Double Silver: Earned 200,000,000 credits (200,301,443)
Message 79652 - Posted: 22 Sep 2014 | 13:25:56 UTC - in response to Message 79651.

1) For reasons unknown, amongst all the other correct tasks on that computer, this one task reported the time incorrectly, but otherwise ran correctly.

This case, definitely.

I've checked logs on different computers and found that this case is much more common then I thought. I found quite a lot of sieve tasks which reported less CPU and elapsed time then they really takes. They should be within 1400-1600 seconds, depending on CPU, but sometimes reported lower value up to 1000 seconds. The true execution time, according to full log, was in correct range. Since 1000 seconds was enough to pass validation, I didn't noticed anything until I got one unlucky task which reported really low value.

The first suspect for me is that all these computers are set to "suspend on user activity" Boinc mode, so all tasks is question were killed and restarted few times. May be there is a glitch somewhere. But it didn't happens with each ever restarted task. All computers were running Boinc 7.2.42 on WIN64. I'll check logs from other computers (with different OS and without restart) later.

ID: 79652 | Report as offensive

Message boards : Extended Sierpinski Problem : Change to PSP/SoB/ESP sieve validation criteria

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