"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


-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:


am I right in assuming that I as a user can choose between
ethernet and infiniband by issuing
mpirun --mca btl tcp  my_job
mpirun --mca btl openib my_job
respectivly ?
What does "btl" stand for?


Vorstand: Ertu Uysal, Axel Queck
Vorsitzender des Aufsichtsrats: Bernhard Bruscha
Sitz der Gesellschaft: Tuebingen
Amtsgericht Stuttgart HRB 381299

Diese E-Mail enthaelt vertrauliche und/oder rechtlich geschuetzte 
Informationen. Wenn Sie nicht der richtige Adressat sind oder diese 
E-Mail irrtuemlich erhalten haben, informieren Sie bitte sofort den 
Absender und vernichten Sie diese Mail. Das unerlaubte Kopieren sowie
die unbefugte Weitergabe dieser Mail ist nicht gestattet.

This e-mail may contain confidential and/or privileged information.
If you are not the intended recipient (or have received this e-mail 
in error) please notify the sender immediately and destroy this 
e-mail. Any unauthorized copying, disclosure or distribution of the 
material in this e-mail is strictly forbidden. 

users mailing list