Message boards :
Number crunching :
Crazily short WU?
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Author | Message |
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![]() Send message Joined: 25 Apr 03 Posts: 45 Credit: 259,298 RAC: 0 ![]() |
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? --- ![]() Computers Crunching: Laptop (1.4GHz, 512mb RAM) Main Laptop (Dual Core 2.16GHz, 2gb RAM) |
![]() Send message Joined: 3 Apr 99 Posts: 1603 Credit: 2,700,523 RAC: 0 ![]() |
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. ![]() |
![]() Send message Joined: 6 Apr 03 Posts: 498 Credit: 3,200,504 RAC: 0 ![]() |
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Alinator Send message Joined: 19 Apr 05 Posts: 4178 Credit: 4,647,982 RAC: 0 ![]() |
Also, they tend to come in 'bunches', so it's not unusal to see a few in row with a relatively fast host. Alinator |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 ![]() |
Well, ya know, sometimes short happens. |
Josef W. Segur Send message Joined: 30 Oct 99 Posts: 4504 Credit: 1,414,761 RAC: 0 ![]() |
... 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 |
Odysseus ![]() Send message Joined: 26 Jul 99 Posts: 1808 Credit: 6,701,347 RAC: 6 ![]() |
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. ![]() |
Brian Silvers Send message Joined: 11 Jun 99 Posts: 1681 Credit: 492,052 RAC: 0 ![]() |
... I'm reminded of several songs: Sound of Silence - Simon & Garfunkel Silence Must Be Heard - Enigma Enjoy the Silence - Depeche Mode |
Odysseus ![]() Send message Joined: 26 Jul 99 Posts: 1808 Credit: 6,701,347 RAC: 6 ![]() |
I'm reminded of several songs: Don’t forget John Cage’s 4'33" ! |
Brian Silvers Send message Joined: 11 Jun 99 Posts: 1681 Credit: 492,052 RAC: 0 ![]() |
I'm reminded of several songs: 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. |
![]() Send message Joined: 2 Aug 00 Posts: 1851 Credit: 5,955,047 RAC: 0 ![]() |
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. |
Joseph Monk Send message Joined: 31 Mar 07 Posts: 150 Credit: 1,181,197 RAC: 0 ![]() |
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... |
![]() ![]() Send message Joined: 13 Oct 00 Posts: 611 Credit: 2,025,000 RAC: 0 ![]() |
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 |
Dark Angel ![]() Send message Joined: 26 Aug 01 Posts: 432 Credit: 2,673,754 RAC: 0 ![]() |
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. ![]() ![]() ![]() |
![]() ![]() Send message Joined: 28 Jan 06 Posts: 1410 Credit: 934,158 RAC: 0 ![]() |
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. ![]() |
Joseph Monk Send message Joined: 31 Mar 07 Posts: 150 Credit: 1,181,197 RAC: 0 ![]() |
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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