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Please, explain why this task was replicated before deadline

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Raistmer*

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Message 55541 - Posted: 11 Sep 2012, 13:35:16 UTC
Last modified: 11 Sep 2012, 13:45:00 UTC

Web page snapshot:

имя ps_separation_09_2s_sample_2_1341007502_39845372
приложение MilkyWay@Home
создан 9 Sep 2012 | 12:12:09 UTC
канонический результат 296176659
предоставлено очков 159.86
минимальный кворум 2
начальная репликация 3
макс. # ошибок/всего/успешных заданий 3, 9, 6
Задание
щёлкните для деталей Компьютер Отправлен Время подтверждения
или крайний срок
объяснить Статус Время выполнения
(сек) Время ЦП
(сек) Очки Приложение
295012615 466524 9 Sep 2012 | 12:12:34 UTC 11 Sep 2012 | 5:43:03 UTC Ошибка проверки 125,297.33 102,347.80 --- MilkyWay@Home
Анонимная платформа (Тип ЦП)
296176659 279471 11 Sep 2012 | 5:44:14 UTC 11 Sep 2012 | 6:49:58 UTC Завершён и проверен 81.19 3.63 159.86 MilkyWay@Home v1.02 (opencl_amd_ati)
296209210 100748 11 Sep 2012 | 6:50:45 UTC 11 Sep 2012 | 6:55:43 UTC Ошибка при расчёте 0.00 0.00 --- MilkyWay@Home v1.02 (opencl_nvidia)
296212422 449908 11 Sep 2012 | 6:56:43 UTC 11 Sep 2012 | 7:29:03 UTC Завершён и проверен 47.34 1.76 159.86 MilkyWay@Home v1.02 (opencl_amd_ati)

http://milkyway.cs.rpi.edu/milkyway/workunit.php?wuid=233358927

Why task was replicated before my host (first one) reached deadline ? And why two other hosts agree with result w/o taking into account result of my host. My host did not recive credit for work done and done in time. Why so ?

EDIT: my task stderr:

Integral 0 time = 15421.355279 s
Running likelihood with 95435 stars
Likelihood time = 68.491611 s
<background_integral> 0.000497320926239 </background_integral>
<stream_integral>  2.496879041487651  1240.071068395495104 </stream_integral>
<background_likelihood> -7.095372261004239 </background_likelihood>
<stream_only_likelihood>  -168.062165191004453  -8.938599239026907 </stream_only_likelihood>
<search_likelihood> -6.429949459557490 </search_likelihood>


Validated one stderr:
Integral 0 time = 77.283666 s
Running likelihood with 95435 stars
Likelihood time = 1.206203 s
<background_integral> 0.000497293570797 </background_integral>
<stream_integral>  2.496879041487651  1240.071068395494900 </stream_integral>
<background_likelihood> -7.095348371713471 </background_likelihood>
<stream_only_likelihood>  -168.062165191004450  -8.938599239026907 </stream_only_likelihood>
<search_likelihood> -6.429930674851704 </search_likelihood>


Another validated one:
Integral 0 time = 44.209482 s
Running likelihood with 95435 stars
Likelihood time = 0.747686 s
<background_integral> 0.000497293570797 </background_integral>
<stream_integral>  2.496879041487651  1240.071068395494900 </stream_integral>
<background_likelihood> -7.095348371713471 </background_likelihood>
<stream_only_likelihood>  -168.062165191004450  -8.938599239026907 </stream_only_likelihood>
<search_likelihood> -6.429930674851704 </search_likelihood>


Take note, both validated results are from same device type, ATi GPU. So they results are identical.
Do differencies in my result too big? And why result status not invalid in this case but "can not validate" one ?
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Len LE/GE

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Message 55544 - Posted: 11 Sep 2012, 20:30:38 UTC - in response to Message 55541.  
Last modified: 11 Sep 2012, 20:54:08 UTC

The status of your result changed to validate error.
MW calculations and results need double precision.
Your stream_only_likelihood seems ok for cross platform comparison, but background_likelihood and search_likelihood are only identical up to the 4th decimal digit which is far from what is needed.

The validator decided your result needed a second one to compare against and the WU was sent out again a minute later; this was repeated until 2 results did match within the allowed difference.
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Message 55546 - Posted: 12 Sep 2012, 8:40:45 UTC - in response to Message 55541.  

Why task was replicated before my host (first one) reached deadline ? And why two other hosts agree with result w/o taking into account result of my host. My host did not recive credit for work done and done in time. Why so ?

It was replicated after your host returned it's result (and the validator apparently didn't like it so much).

5:43:03 UTC: your host reported it's result
5:43:10 UTC: _1 created (7 seconds after your report)
5:44:14 UTC: _1 send out
...

I think there's nothing unusual with that.
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Message 55551 - Posted: 13 Sep 2012, 10:00:29 UTC

Well, maybe the problem is just in bad translation.
I saw status "Ошибка проверки", what I think should mean "can't validate", not "invalid result".

How to disable this auto-translation? I prefer to see task status in original form...
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Message 55553 - Posted: 13 Sep 2012, 10:22:59 UTC

And why minimal quorun here 2 and only 1 task was validated?


имя	de_separation_09_2s_sample_2_1341007502_40758055
приложение	MilkyWay@Home
создан	11 Sep 2012 | 3:19:21 UTC
канонический результат	296109493
предоставлено очков	159.86
минимальный кворум	2
начальная репликация	1
макс. # ошибок/всего/успешных заданий	3, 9, 6
Задание
щёлкните для деталей	Компьютер	Отправлен	Время подтверждения
или крайний срок 
объяснить	Статус	Время выполнения
(сек)	Время ЦП
(сек)	Очки	Приложение
296109493	454110	11 Sep 2012 | 3:20:38 UTC	12 Sep 2012 | 15:21:55 UTC	Завершён и проверен	66,733.63	50,200.37	159.86	MilkyWay@Home
Анонимная платформа (Тип ЦП)
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Message 55557 - Posted: 13 Sep 2012, 19:02:51 UTC - in response to Message 55551.  
Last modified: 13 Sep 2012, 19:09:07 UTC

Well, maybe the problem is just in bad translation.
I saw status "Ошибка проверки", what I think should mean "can't validate", not "invalid result".

How to disable this auto-translation? I prefer to see task status in original form...

The status was IIRC "validate error", so "can't validate" is pretty good translation. I don't know why, but here on Milkyway the usual "marked as invalid" status seem not to be in use.

You can change the language here, it's valid for all Milkyway pages (until you delete the cookie or until it expires, than you have to set it again).



And why minimal quorun here 2 and only 1 task was validated?

Hmm... good question, until not so long time ago minimum quorum was 1 at the begining and was increased to 2 only if the result was inconclusive. Well, as long as it works...
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Message boards : Number crunching : Please, explain why this task was replicated before deadline

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