On Jun 23, 2014, at 8:48 AM, Mike Dubman <mi...@dev.mellanox.co.il> wrote:

> btw, i think now, when parent process is killed before child, OS makes child 
> as "<defunct>" which stick around for good.

The grandparent should inherit the child.  If the grandparent then does not 
wait(2) on the child, then the child will remain a zombie / defunct.  So in our 
specific case, this behavior will depend on what the parent process of mpirun 
is and whether it is waiting on child processes appropriately.

-Dave

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