Crazily short WU?

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Profile Scooley01

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Message 548761 - Posted: 18 Apr 2007, 22:58:52 UTC

I'm a little confused about something. I don't know if it's just that I've never noticed it before, or if it's just a recent occurrence, but I've had at least two or three WU complete in around one minute. Normally my WU take between 3 and 5 hours per CPU (So two crunching at a time at that speed), but during this morning's upload difficulties, I saw some of the WU that were completed overnight took close to a minute to complete. I understand that processing speed depends on the Angle, but cutting 4 hours down to one minute seems like it'd be out of the normal range of variation. Any ideas?
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Profile MikeSW17
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Message 548775 - Posted: 18 Apr 2007, 23:41:18 UTC

It happens.
Many of the tapes Berkeley are serving up at the moment are those that they suspect contain nothing of interest - either full of 'noise' or perhaps 'silence'.
Nothing to worry about if you're getting a few that have virtually nothing in them to crunch.

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Message 548790 - Posted: 19 Apr 2007, 0:26:26 UTC

Yes I got like 3 in a row last night. maybe they are the same.
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Message 548803 - Posted: 19 Apr 2007, 1:22:38 UTC

Also, they tend to come in 'bunches', so it's not unusal to see a few in row with a relatively fast host.

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Message 548826 - Posted: 19 Apr 2007, 2:25:55 UTC

Well, ya know, sometimes short happens.
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Josef W. Segur
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Message 548831 - Posted: 19 Apr 2007, 2:34:58 UTC - in response to Message 548775.  

...
Many of the tapes Berkeley are serving up at the moment are those that they suspect contain nothing of interest - either full of 'noise' or perhaps 'silence'.

Silence is thoroughly checked and takes almost as much time as data with the normal expected noise level. It's the noisy ones which quickly get to having as many "signals" to report as the project is willing to put in their master science database.
                                                                Joe
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Message 548861 - Posted: 19 Apr 2007, 3:31:42 UTC - in response to Message 548761.  
Last modified: 19 Apr 2007, 3:32:31 UTC

I don't know if it's just that I've never noticed it before, or if it's just a recent occurrence, but I've had at least two or three WU complete in around one minute.

“Noisy” WUs are easy to identify from the text output on the result page. You’ll see a message like this:
SETI@Home Informational message -9 result_overflow
NOTE: The number of results detected exceeds the storage space allocated.

As you’ve noticed, these often (but definitely not always) take only a minute or so; regardless, they’re generally granted a normal amount of credit for the amount of crunching done on them.

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Message 548862 - Posted: 19 Apr 2007, 3:38:58 UTC - in response to Message 548831.  

...
Many of the tapes Berkeley are serving up at the moment are those that they suspect contain nothing of interest - either full of 'noise' or perhaps 'silence'.

Silence is thoroughly checked and takes almost as much time as data with the normal expected noise level. It's the noisy ones which quickly get to having as many "signals" to report as the project is willing to put in their master science database.
                                                                Joe


I'm reminded of several songs:

Sound of Silence - Simon & Garfunkel
Silence Must Be Heard - Enigma
Enjoy the Silence - Depeche Mode
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Message 548891 - Posted: 19 Apr 2007, 5:41:25 UTC - in response to Message 548862.  
Last modified: 19 Apr 2007, 5:41:42 UTC

I'm reminded of several songs:
Sound of Silence - Simon & Garfunkel
Silence Must Be Heard - Enigma
Enjoy the Silence - Depeche Mode

Don’t forget John Cage’s 4'33" !
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Brian Silvers

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Message 548901 - Posted: 19 Apr 2007, 6:01:26 UTC - in response to Message 548891.  

I'm reminded of several songs:
Sound of Silence - Simon & Garfunkel
Silence Must Be Heard - Enigma
Enjoy the Silence - Depeche Mode

Don’t forget John Cage’s 4'33" !


I had never heard of that before. I looked it up and find it interesting that he denied that it has any correlation to absolute zero.
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Profile Clyde C. Phillips, III

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Message 549128 - Posted: 19 Apr 2007, 18:55:55 UTC

There are some units that are contaminated with RFI noise. Maybe a plane or satellite passed close to the scope or to its focus. Maybe Seti generated a test signal. I believe noise like that causes a "result overflow" and causes the unit to abort. Apparently something was programmed in to terminate these units because they're useless as far as extraterrestrial signal study is concerned. I remember only one song of the ones mentioned about silence: "The Sounds of Silence" sung by Simon and Garfunkel, #1, in January 1966.
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Message 549203 - Posted: 19 Apr 2007, 21:03:43 UTC

How about a crazy big WU? I normally complete 60cr ones in under 3 hours, one of the two I'm crunching right now is an 11hr one... never gotten one that big before...
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Message 549210 - Posted: 19 Apr 2007, 21:11:13 UTC - in response to Message 549203.  

How about a crazy big WU? I normally complete 60cr ones in under 3 hours, one of the two I'm crunching right now is an 11hr one... never gotten one that big before...


Hmmm, sounds like a stuck WU. Have you tried to exit BOINC (rsp. stop the service, if it's installed that way) and restart BOINC?

Andy
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Message 549314 - Posted: 20 Apr 2007, 2:13:02 UTC - in response to Message 549203.  

How about a crazy big WU? I normally complete 60cr ones in under 3 hours, one of the two I'm crunching right now is an 11hr one... never gotten one that big before...


Got one once the issued over 91 credits...took my machine about an hour and 45 minutes.

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Message 549471 - Posted: 20 Apr 2007, 8:45:07 UTC - in response to Message 549203.  

How about a crazy big WU? I normally complete 60cr ones in under 3 hours, one of the two I'm crunching right now is an 11hr one... never gotten one that big before...



I've had WUs up to 94 point something. Nothing unusual. The eleven hours is only an estimate, and you may find it takes much less. Just keep an eye on it, to ensure it continues to progress.

BOINC has been written in such a way that "noisy" WUs are aborted soon after starting. This saves a machine crunching for no good scientific reason. A "noisy" WU is one that contains an improbably high number of signals, indicating the recording has been "contaminated" by some terrestrial source.
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Message 549528 - Posted: 20 Apr 2007, 11:27:16 UTC

It finished while I was at work, took: 20,813.34 and gave me 62cr... bit odd since 62cr normally takes between 8k and 10k.
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Message boards : Number crunching : Crazily short WU?


 
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