186 Work Units going back almost a month, not yet validated

Questions and Answers : Web site : 186 Work Units going back almost a month, not yet validated

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polliard

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Message 995654 - Posted: 11 May 2010, 22:54:30 UTC

Is there something I need to do? The validation seems to be almost a month behind. Not sure what Im not doing right.


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Message 995659 - Posted: 11 May 2010, 23:17:52 UTC - in response to Message 995654.  

On most projects, at least two tasks are sent out to different hosts. Those hosts will usually have different CPU makes (in some cases even GPUs) and different cache lengths (the amount of work one wants to have in store to cover for project outages).

The project doesn't take all data back and puts it in a database, it'll want to verify that the data you sent back isn't just a chapter of your favorite sci-fi book. And thus, they validate it against another computer.

Only when both results from both computers match each-other, is a copy put in the science database, credits granted etc. If they do not match, a third copy of this task is sent out and done by another computer. When that one sends its result back, that gets checked against the two that were available before. The result matching the third one gets credit, the one not matching does not get credit.

Since deadlines differ per project, it can take quite a while for tasks to get credit, especially if it has to wait for someone else's deadline to pass before it's sent out again and then returned. We're talking months here, in some cases even half a year.


Jord

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polliard

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Message 995678 - Posted: 12 May 2010, 0:00:02 UTC - in response to Message 995659.  

Thanks for the info, I was just used to very rapid (a week or two at most) credit assignment.

Thanks

Thomas


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John McLeod VII
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Message 995708 - Posted: 12 May 2010, 3:09:39 UTC - in response to Message 995678.  

Thanks for the info, I was just used to very rapid (a week or two at most) credit assignment.

Thanks

Thomas

Sometimes you get lucky, sometimes you don't. There have been cases of a task that waits a year for validation. Most of the time it is less than a fortnight. About half the tasks are the second returned for a WU and are valid, and are validated instantly. Note that about is because of late work, errors, etc.


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Message 996244 - Posted: 14 May 2010, 20:21:33 UTC

Since about 12 May I have been downloading successfully. But uploading is not working.

Two files hanging fire. 09mr07ae.18910.17659.11.10.248_2_0 and
21mr07ah.8150.18886.11.10.57_0_0

Solution? Or just wait for it to be resolved.

RAY


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Profile BilBg
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Message 996269 - Posted: 14 May 2010, 22:40:26 UTC - in response to Message 996244.  
Last modified: 14 May 2010, 22:41:42 UTC

.

Congratulations for your first post in 11 years

Read:

Uploads failing??
http://setiathome.berkeley.edu/forum_thread.php?id=59985

Panic Mode On Server problems
http://setiathome.berkeley.edu/forum_thread.php?id=59938&nowrap=true#996076

.





- ALF - "Find out what you don't do well ..... then don't do it!" :)

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Questions and Answers : Web site : 186 Work Units going back almost a month, not yet validated


 
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