You use the *_base_verbose MCA variables. For example, if you want to see 
output from the btl use -mca btl_base_verbose x. The number x controls the 
verbosity level. Starting with 2.x are named levels but now many components 
conform to the names yet. In general components use use numbers between 0 and 
100 (inclusive) with 100 being very verbose.

-Nathan

> On May 22, 2016, at 12:36 AM, dpchoudh . <dpcho...@gmail.com> wrote:
> 
> Hello all
> 
> I have built and installed OMPI with --enable-debug set. What runtime 
> parameter do I need to see the output from OPAL_DEBUG_OUTPUT?
> 
> Thank you
> Durga
> 
> We learn from history that we never learn from history.
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