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:
> Im running on a cluster with mvapi. I built with mvapi and it
> runs, but I want to make absolutely sure that Im using the IB
> and nothing else. How can I tell specifically what interconnect
> Im using when I run.
> Bernie Borenstein
> The Boeing Company
> users mailing list