Ghost WU - issue with the database?

Message boards : Number crunching : Ghost WU - issue with the database?

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Aegis Maelstrom

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Message 58988 - Posted: 23 Jan 2009, 8:47:13 UTC

Hi All,

recently, while watching the list of the recent tasks for my main computer (here) I've learned it says now I have more work units to complete that I actually have waiting on my computer.

Precisely, some new WU popped up on this list (see ID 220650574, and here).

It says it has been issued on 13 of Jan. Well, since then I've completed many WUs issued on the 13th and later. What is more, I check the task webpage quite often and I don't remember any task waiting on the bottom of the list.

I've checked the job_log_boinc.bakerlab.org_rosetta.txt file (I suppose it should log all the WUs) but I can't see this name (abinitio_norelax_homfrag_129_B_1t2iA_SAVE_ALL_OUT_4626_12762) there.

Now I am puzzled what is the issue. Is it some mix up in the database?
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Mod.Sense
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Message 58992 - Posted: 23 Jan 2009, 14:33:30 UTC
Last modified: 23 Jan 2009, 14:39:07 UTC

"Ghost WUs" is exactly what people generally call them. They occur when a scheduler request gets interrupted before completely reaching the client. The client gets an error something like "no end tag in scheduler reply" and goes marrily on to retry later and get work.

So, it basically points to an unstable network connection somewhere between the server and your machine. If there is anything you can do on your end to make that more stable, that would always be advisable. Otherwise, ghosts do just happen, and the normal deadline expiration and reissue mechanism is used to move them through the system.
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Message boards : Number crunching : Ghost WU - issue with the database?



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