You may specify which BTLs to use at runtime using an mca parameter:
mpirun -np 2 -mca btl self,mvapi ./my_app
This specifies to only use self (loopback) and mvapi.
You may want to also use sm (shared memory) if you have multi-core or multi-proc.. such as:
mpirun -np 2 -mca btl self,sm,mvapi ./my_app
This is also in the FAQ:
And for mvapi/openib performance considerations:
On Apr 13, 2006, at 7:56 PM, Borenstein, Bernard S wrote:
I’m running on a cluster with mvapi. I built with mvapi and it runs, but I want to make absolutely sure that I’m using the IB interconnect
and nothing else. How can I tell specifically what interconnect I’m using when I run.
The Boeing Company
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