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IDProjectCategoryView StatusDate SubmittedLast Update
0000150Hall D OfflineGeneralpublic2011-10-18 11:032011-11-07 14:43
Assigned Tostaylor 
PlatformOSOS Version
Summary0000150: Reconstruction hangs on certain events
DescriptionHere is the e-mail originally sent by Igor Senderovich:

Hi David, hi Simon,

I've isolated an event that essentially hangs the reconstruction, i.e. halts with 100% CPU [^] <> [^]

You can reproduce this with the phys_tree plugin. Trying to view the event with hdview2 couldn't work either for the same problem, presumably: it froze on me too.

I suspect the rate of such chokes is about 1 in a hundred events. This was event 136. Running reconstruction with 7 threads produced crippled all the threads before reaching event 1000. (I can try to isolate the others for you)

I should note, this is with revision 8351

Thanks, and let me know how I could help.
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staylor (developer)
2011-10-24 16:54

I have confirmed the behavior on ifarm1102: the code hangs on this event and eventually causes a segmentation fault. I have isolated the problem to what appears to be
nonsense in the start counter (T=9.13056e+22) for one of the tracks. When the DChargedTrackHypothesis code tries to match this to the RF bucket it effectively enters an infinite loop...
staylor (developer)
2011-11-07 14:42

I have put a trap in the code to deal with nonsense in the start counter (or any other detector) by looking at times relative to the smallest drift time in the drift chambers.

- Issue History
Date Modified Username Field Change
2011-10-18 11:03 davidl New Issue
2011-10-24 16:54 staylor Note Added: 0000186
2011-10-24 16:58 staylor Status new => confirmed
2011-10-24 16:58 staylor Status confirmed => assigned
2011-10-24 16:58 staylor Assigned To => staylor
2011-11-07 14:42 staylor Note Added: 0000198
2011-11-07 14:43 staylor Status assigned => resolved
2011-11-07 14:43 staylor Resolution open => fixed

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