With few exceptions, Open MPI will choose the best BTL. There are two
exceptions I know about:
1. sm - we didn't figure out a clean way to do it, nor we spent too
much time trying to
2. elan - the initialization of the device is a global operation, and
we cannot guarantee that all nodes are involved in the accept/connect.
george.
On Apr 21, 2009, at 09:28 , Katz, Jacob wrote:
Hi,
In a dynamically connected client/server-style application, where
the server uses MPI_OPEN_PORT/MPI_COMM_ACCEPT and the client uses
MPI_COMM_CONNECT, what will be the communication method (BTL) chosen
by OMPI? Will the communication thru the resultant inter-
communicator use TCP, or will OMPI choose the best possible method
(e.g. sm if the client and the server are on the same node)?
Thanks.
--------------------------------
Jacob M. Katz | jacob.k...@intel.com | Work: +972-4-865-5726 | iNet:
(8)-465-5726
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