Re: [Condor-users] Black hole node

[Terrence Martin <tmartin@xxxxxxxxxxxxxxxx>]

Alain Roy wrote:
>    * There are lots black holes: machines that cause segfaults (how
>      do you distinguish from a user job that just segfaults?),
>      machines that cause jobs to run slowly (how do you distinguish
>      from slow jobs?), and machines that cause jobs to exit quickly.
>
>   

> I agree that it's nice to have such a black hole system, but it's 
> definitely a challenge.
>
>   
I am wondering if information collection of my cluster might be a good 
place to start to see if there is a pattern that blackholes exhibit that 
may be different from say a standard failing job. For example a 
blackhole would be user independent. For example a single users jobs all 
disappearing in say 120s or less would indicate a specific users problem 
whereas a node that gobbles up jobs irrespective of a user would flag 
much more strongly for being a blackhole.  If there is a distinctive 
pattern then it might be easier to devise a counter measure.

Terrence


> -alain
>
>
>
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