On Jul 7, 2011, at 5:59 PM, Qasim Ali wrote:

> Hi Jeff,
> 
> Thanks for following up. I have a question to clear things.
> 
> 1. If I do not specify any affinity in mpirun, what memory allocation policy 
> is used by default?

None.

> a. When it is not compiled with libnuma 
> b. when compiled with libnuma

Memory affinity doesn't really make sense unless process affinity is used.  
I.e., why pin your memory if your process could move?

> BTW What do you mean by "internal memory" in OMPI? 

Memory that Open MPI uses internally -- such as shared memory to communicate 
between processes on the same server.  I.e., this is memory that Open MPI does 
not expose to the user; it's private, internal memory.

-- 
Jeff Squyres
jsquy...@cisco.com
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