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'timeouts' problem fixed [message #10459]

Tue, 23 March 2010 19:37

Gianluigi Boca
Messages: 177
Registered: March 2004

first-grade participant

From: *gsi.de

hallo,
the problem of some events taking too much time for processing with the STT real Patter Recognition has been solved.
As expected, it was caused by 'bad' events in which some very low momentum particles - probably delta rays - originated along the 'main' tracks.
These low momentum tracks continued to spiralize many times into the STT system producing typically 100 hits in few straws.
The PR algorithm then essentially goes nuts. It is not a matter of this particulary algorithm, any algorithm would fail in these situations.
I choose to reject those hits produced by spiralization simply by excluding those straws with multiple hits from the PR.
Noe the situation is back to normal.
Please update your stt directory
Gianluigi

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Re: 'timeouts' problem fixed [message #10460 is a reply to message #10459]

Tue, 23 March 2010 23:16

Johan Messchendorp
Messages: 693
Registered: April 2007
Location: University of Groningen

first-grade participant

From: *xs4all.nl

Hi,

Many thanks. It indeed looks much much much more stable than before. I just did a massive test of 1000 jobs, each with 10 events and each with a different random seed on a homogeneous system with 40 cores (64 bit, Suse Enterprise), running the stt QA macros (1 & 4). The outcome is: 989 jobs finished successfully, 9 jobs did not pass the validation test (output has text that contains words like "Segmentation violation" "Segmentation fault" "Abort" "Bus error" "Floating point exception"), and 2 jobs did not finish within 3 hours (timeout). That is already a serious improvement!! The origin of the validation errors, I didn't check, but they also seem to occur with the ideal track finder (so might be related to something else). Two jobs ended with a timeout... hmmmm Rolling Eyes

Johan.

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