"btl" = bit transport layer
Yes, you can do so (assuming you configured/built support for both
transports into OMPI), but you probably don't want to specify things
that tightly. Usually, people do:
-mca btl tcp,sm,self
or
-mca btl openib,sm,self
This also selects the shared memory subsystem that provides
performance for processes that share nodes, and a "self" module that
supports simplified loopback calls when the code winds up sending
something back to the calling process.
On Nov 20, 2008, at 6:22 AM, Hailperin, Isaac wrote:
Hi,
am I right in assuming that I as a user can choose between
ethernet and infiniband by issuing
mpirun --mca btl tcp my_job
or
mpirun --mca btl openib my_job
respectivly ?
What does "btl" stand for?
Isaac
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