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From: Galen M. Shipman (gshipman_at_[hidden])
Date: 2006-04-13 22:12:33

Hi Bernie,

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.
> Bernie Borenstein
> The Boeing Company
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