How to find out why some jobs wont stop?

[Max Görner]

Dear list,

I run some very complicated sampling in parallel on a Xubuntu (16.04)
machine. With "complicated sampling" I mean that my calculations are
influenced by noise and thus I do them over and over again to see how
that noise affects my calculations.

With "in parallel" I mean that I have 4 real cores which I all use with
the help of the programm "parallel --semaphore". This will launh
exactly 4 identical jobs, waits until one completes and launches another
one.

My calculations are both memory and time intense. I expect more than ten
hours of runtime and around 2GiB of memory consumption for each job.

Almost everything works fine, but sometimes some jobs just don't quit.
I had some running over 10 days now. Is there anything I can do to find
out why some jobs just don't stop?

Thank you all very much.

sincerly, Max Görner

-- 
Technische Universität Dresden Institut für Allgemeine Psychologie
und Methoden der Psychologie 01062 Dresden

Tel.: 0351 - 463 37899 PGP:
https://wwwpub.zih.tu-dresden.de/~maxgoern/2FE6023F.asc

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